CN113098507A - Voltage controlled oscillator and phase-locked loop frequency synthesizer - Google Patents

Abstract

The invention discloses a voltage-controlled oscillator and a phase-locked loop frequency synthesizer. The voltage-controlled oscillator includes a ring oscillation module, a frequency adjustment module and a gain adjustment module. The first end of the ring oscillation module is connected to the power supply end, the second end of the ring oscillation module is respectively connected to the first end of the frequency adjustment module and the first end of the gain adjustment module; the second end of the frequency adjustment module and the second end of the gain adjustment module The third end of the frequency adjustment module is connected to the control voltage, and the third end of the gain adjustment module is connected to the adjustment controller of the phase-locked loop frequency synthesizer. The frequency adjustment module of the present invention adjusts the output frequency of the oscillating signal in a manner not greater than the first adjustment accuracy according to the control voltage; the gain adjustment module adjusts the output frequency and voltage control of the oscillation signal in a manner not less than the second adjustment accuracy according to the reference clock control signal The gain of the oscillator can reduce the gain deviation; eliminates the phase noise generated by the bias circuit.

Description

Voltage Controlled Oscillator and Phase Locked Loop Frequency Synthesizer

technical field

The invention relates to the technical field of ring oscillators, in particular to a voltage-controlled oscillator and a phase-locked loop frequency synthesizer.

Background technique

This section is intended to provide a background or context to the embodiments of the invention recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section.

The ring oscillator is composed of several inverters connected end to end. Several inverters themselves contribute a phase shift of 180 degrees, and each node is added together to contribute an additional phase shift of 180 degrees, and the signal passes through these numbers. When the gain after the inverter is greater than 0dB, it will easily meet the conditions of oscillation. The inverter can be single-phase or differential. The single-phase ring oscillator has a simple structure and is easier to obtain a higher oscillation frequency. The ring oscillator with differential inverter structure is more suitable for application scenarios with large system noise, because the differential structure is more conducive to suppressing system noise.

Ring oscillators are often used in phase-locked loop frequency synthesizers. At this time, the ring oscillator will be appropriately modified to achieve the purpose of the output frequency being controlled by the input voltage. The modified output frequency can be controlled by the input voltage of the ring oscillator. It is referred to as a Voltage Controlled Oscillator (VCO). In the existing VCO, it is generally composed of a bias circuit, a ring oscillator circuit, and a control voltage-to-current circuit. However, when the existing voltage-controlled oscillator is applied to the phase-locked loop frequency synthesizer, there are problems such as excessive gain deviation, excessive phase noise, and complicated frequency adjustment. It is difficult to ensure that the phase-locked loop frequency synthesizer outputs a stable and high-quality clock when it is locked to the target frequency in the presence of the temperature range and manufacturing deviation.

Therefore, the existing VCO has problems of large gain deviation and large phase noise.

SUMMARY OF THE INVENTION

An embodiment of the present invention provides a voltage-controlled oscillator, which is respectively connected to a power supply terminal and a ground terminal to reduce gain deviation and phase noise. The voltage-controlled oscillator includes:

Ring oscillation module, frequency adjustment module and gain adjustment module;

The first end of the ring oscillation module is connected to the power supply end, the second end of the ring oscillation module is respectively connected to the first end of the frequency adjustment module and the first end of the gain adjustment module; the third end of the ring oscillation module is the output end of the ring oscillation module ;

The second end of the frequency adjustment module and the second end of the gain adjustment module are connected to the grounding end in common; the third end of the frequency adjustment module is connected to the control voltage, and the third end of the gain adjustment module is connected to the adjustment controller of the phase-locked loop frequency synthesizer;

Ring oscillation module, used to generate the oscillation signal of the voltage-controlled oscillator;

a frequency adjustment module, configured to adjust the output frequency of the oscillation signal of the voltage-controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage;

The gain adjustment module is used for adjusting the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator in a manner not less than the second adjustment accuracy according to the reference clock control signal output by the adjustment controller.

An embodiment of the present invention also provides a voltage-controlled oscillator, which is respectively connected to a power supply terminal and a ground terminal to reduce gain deviation and phase noise. The voltage-controlled oscillator includes:

Ring oscillation module, frequency adjustment module and gain adjustment module;

The first end of the gain adjustment module and the first end of the ring oscillation module are connected to the power supply end, and the second end of the gain adjustment module and the second end of the ring oscillation module are connected to the first end of the frequency adjustment module; the frequency adjustment module The second terminal is connected to the ground terminal;

The third end of the ring oscillation module is the output end of the ring oscillation module, the third end of the frequency adjustment module is connected to the control voltage, and the third end of the gain adjustment module is connected to the automatic adjustment controller of the phase-locked loop frequency synthesizer;

Ring oscillation module, used to generate the oscillation signal of the voltage-controlled oscillator;

a frequency adjustment module, configured to adjust the output frequency of the oscillation signal of the voltage-controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage;

The gain adjustment module is used for adjusting the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator in a manner not less than the second adjustment accuracy according to the reference clock control signal output by the adjustment controller.

An embodiment of the present invention also provides a voltage-controlled oscillator, which is respectively connected to a power supply terminal and a ground terminal to reduce gain deviation and phase noise. The voltage-controlled oscillator includes:

Ring oscillation module, frequency adjustment module and gain adjustment module;

The first end of the gain adjustment module and the first end of the frequency adjustment module are connected to the power supply end, the second end of the gain adjustment module and the second end of the frequency adjustment module are connected to the first end of the ring oscillation module, and the The second terminal is connected to the ground terminal;

The third end of the ring oscillation module is the output end of the ring oscillation module, the third end of the frequency adjustment module is connected to the control voltage, and the third end of the gain adjustment module is connected to the automatic adjustment controller of the phase-locked loop frequency synthesizer;

Ring oscillation module, used to generate the oscillation signal of the voltage-controlled oscillator;

a frequency adjustment module, configured to adjust the output frequency of the oscillation signal of the voltage-controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage;

The gain adjustment module is used for adjusting the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator in a manner not less than the second adjustment accuracy according to the reference clock control signal output by the adjustment controller.

An embodiment of the present invention also provides a voltage-controlled oscillator, which is respectively connected to a power supply terminal and a ground terminal to reduce gain deviation and phase noise. The voltage-controlled oscillator includes:

Ring oscillation module, frequency adjustment module and gain adjustment module;

The first end of the frequency adjustment module is connected to the power supply end, the second end of the frequency adjustment module and the first end of the gain adjustment module are connected to the first end of the ring oscillation module, and the second end of the gain adjustment module is connected to the second end of the ring oscillation module The terminals are connected to the ground terminal in common;

The third end of the ring oscillation module is the output end of the ring oscillation module, the third end of the frequency adjustment module is connected to the control voltage, and the third end of the gain adjustment module is connected to the automatic adjustment controller of the phase-locked loop frequency synthesizer;

Ring oscillation module, used to generate the oscillation signal of the voltage-controlled oscillator;

a frequency adjustment module, configured to adjust the output frequency of the oscillation signal of the voltage-controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage;

The gain adjustment module is used for adjusting the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator in a manner not less than the second adjustment accuracy according to the reference clock control signal output by the adjustment controller.

An embodiment of the present invention further provides a phase-locked loop frequency synthesizer, where the phase-locked loop includes the voltage-controlled oscillator described in any of the foregoing embodiments.

In the embodiment of the present invention, the voltage-controlled oscillator includes a ring oscillation module, a frequency adjustment module, and a gain adjustment module. The first end of the ring oscillation module is connected to the power supply end, and the second end of the ring oscillation module is respectively connected to the first end of the frequency adjustment module. and the first end of the gain adjustment module; the third end of the ring oscillation module is the output end of the ring oscillation module; the second end of the frequency adjustment module and the second end of the gain adjustment module are connected to the ground terminal; the third end of the frequency adjustment module The terminal is connected to the control voltage, and the third terminal of the gain adjustment module is connected to the adjustment controller of the phase-locked loop frequency synthesizer. In this embodiment of the present invention, the frequency adjustment module may adjust the output frequency of the oscillation signal of the voltage-controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage; The output frequency of the oscillation signal of the voltage-controlled oscillator and the gain of the voltage-controlled oscillator can be adjusted by adjusting the precision, so the gain deviation can be reduced; Therefore, phase noise can be reduced.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts. In the attached image:

FIG. 1 shows a schematic diagram of a circuit structure of an existing voltage-controlled oscillator provided by an embodiment of the present invention;

FIG. 2 is a functional block diagram of a voltage-controlled oscillator provided by an embodiment of the present invention;

3 is a functional block diagram of a voltage-controlled oscillator provided by an embodiment of the present invention;

4 is a functional block diagram of a voltage-controlled oscillator provided by an embodiment of the present invention;

5 is a functional block diagram of a voltage-controlled oscillator provided by an embodiment of the present invention;

6 is a functional block diagram of a voltage-controlled oscillator provided by an embodiment of the present invention;

7 is a structural block diagram of a ring oscillation module 101 in a voltage-controlled oscillator provided by an embodiment of the present invention;

FIG. 8 is a structural block diagram of a frequency adjustment module 102 in a voltage-controlled oscillator according to an embodiment of the present invention;

FIG. 9 is a structural block diagram of a gain adjustment module 103 in a voltage-controlled oscillator provided by an embodiment of the present invention;

10 is a circuit structure diagram of a voltage-controlled oscillator provided by an embodiment of the present invention;

FIG. 11 is another circuit structure diagram of a voltage-controlled oscillator provided by an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a phase-locked loop frequency synthesizer provided by an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention more clearly understood, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but not to limit the present invention.

FIG. 1 shows a schematic circuit structure of an existing voltage-controlled oscillator provided by an embodiment of the present invention. For the convenience of description, only the part related to the embodiment of the present invention is shown, and the details are as follows:

As shown in Figure 1, the existing VCO is connected to the power supply terminal and the ground terminal respectively. The VCO includes five parts: a current bias circuit, a current copy circuit, a gain adjustment circuit, a ring oscillator circuit and a waveform shaping module.

Among them, resistor R1, MOS tube MP04, MOS tube MN04 and resistor R2 together constitute a current bias circuit. The control signal BIASCODE is used to adjust the process deviation of the bias current. This signal needs to be provided by an additional process deviation detection circuit.

The MOS transistor MN05 and the resistor R3 together constitute a current copy circuit, and the reference clock control signal FSWCODE is used to control the ratio of the current copy to roughly adjust (adjust in a manner not less than the second adjustment accuracy) the oscillation frequency of the ring oscillator. This control signal is provided by the adjustment controller of the phase-locked loop frequency synthesizer, which is used to control the ring oscillator to work at the desired frequency.

The MOS transistor MN06 is the gain adjustment circuit of the ring oscillator. It is used with the control signal VICCODE to adjust the gain of the ring oscillator. The setting of the control signal varies with the frequency that the PLL frequency synthesizer needs to lock.

MOS tube MP01, MOS tube MP02, MOS tube MP03, MOS tube MN01, MOS tube MN02 and MOS tube MN03 constitute a three-stage ring oscillator circuit, and its oscillation frequency is controlled by the current bias circuit and current copy circuit described above, Its gain is controlled by the gain control circuit described earlier.

C0 is the filter capacitor of the power supply required by the ring oscillator, which is used to stabilize the oscillation frequency of the oscillator.

LSDCC is a waveform shaping circuit, which receives a signal similar to a sine wave from the output node OUT of the ring oscillator, and shapes the rectangular wave required by the output system through the internal circuit.

FIG. 2 shows the functional modules of the voltage-controlled oscillator provided by the first embodiment of the present invention. For the convenience of description, only the part related to the embodiment of the present invention is shown, and the details are as follows:

As shown in Figure 2, the voltage-controlled oscillator is connected to the power supply terminal Vdd and the ground terminal GND respectively. The voltage-controlled oscillator includes:

a ring oscillation module 101, a frequency adjustment module 102 and a gain adjustment module 103;

The first terminal ① of the ring oscillation module 101 is connected to the power supply terminal Vdd, and the second terminal ② of the ring oscillation module 101 is connected to the first terminal ① of the frequency adjustment module 102 and the first terminal ① of the gain adjustment module 103 respectively; The third terminal ③ is the output terminal of the ring oscillation module 101;

The second terminal ② of the frequency adjustment module 102 and the second terminal ② of the gain adjustment module 103 are commonly connected to the ground terminal GND; the third terminal ③ of the frequency adjustment module 102 is connected to the control voltage Vcnt, and the third terminal ③ of the gain adjustment module 103 is connected to Adjustment controller of phase-locked loop frequency synthesizer;

The ring oscillation module 101 is used to generate the oscillation signal of the voltage-controlled oscillator;

a frequency adjustment module 102, configured to adjust the output frequency of the oscillation signal of the voltage controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage Vcnt;

The gain adjustment module 103 is configured to adjust the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator according to the reference clock control signal FSWCODE output by the adjustment controller in a manner not less than the second adjustment accuracy.

The voltage-controlled oscillator provided by the embodiment of the present invention is suitable for: the output frequency of the voltage-controlled oscillator oscillation signal of the phase-locked loop frequency synthesizer is required to increase with the increase of the control voltage Vcnt, and the voltage of the power supply terminal Vdd is not very low. .

The frequency adjustment module 102 adjusts the output frequency of the VCO oscillation signal according to the control voltage Vcnt in a manner not greater than the first adjustment accuracy, that is, the frequency adjustment module 102 fine-tunes the output frequency of the VCO oscillation signal according to the control voltage Vcnt, the gain The adjustment module 103 adjusts the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator according to the reference clock control signal FSWCODE output by the adjustment controller in a manner not less than the second adjustment accuracy, that is, the gain adjustment module 103 adjusts the controller according to the adjustment. The output reference clock control signal FSWCODE coarsely adjusts the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator.

The first adjustment accuracy is smaller than or much smaller than the second adjustment accuracy, and the first adjustment accuracy and the second adjustment accuracy are preset by those skilled in the art according to actual conditions and specific needs. For example, the first adjustment accuracy is 0.3 GHz/step, and the second adjustment accuracy is 0.01 GHz/mV; or the first adjustment accuracy is 0.4 GHz/step, and the second adjustment accuracy is 0.005 GHz/mV. This embodiment of the present invention does not make any special arrangements for this. limits.

In the embodiment of the present invention, the voltage controlled oscillator includes a ring oscillation module 101 , a frequency adjustment module 102 and a gain adjustment module 103 , the first end ① of the ring oscillation module 101 is connected to the power supply terminal Vdd, and the second end ② of the ring oscillation module 101 are respectively connected to the first end ① of the frequency adjustment module 102 and the first end ① of the gain adjustment module 103 ; the third end ③ of the ring oscillation module 101 is the output end of the ring oscillation module 101 ; the second end ② of the frequency adjustment module 102 and the The second terminal ② of the gain adjustment module 103 is commonly connected to the ground terminal GND; the third terminal ③ of the frequency adjustment module 102 is connected to the control voltage Vcnt, and the third terminal ③ of the gain adjustment module 103 is connected to the adjustment controller of the phase-locked loop frequency synthesizer . In the embodiment of the present invention, the frequency adjustment module 102 can adjust (fine-tune) the output frequency of the oscillation signal of the voltage-controlled oscillator according to the control voltage Vcnt in a manner not greater than the first adjustment accuracy; The signal FSWCODE adjusts (roughly adjusts) the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator in a manner not less than the second adjustment accuracy, so that the gain deviation can be reduced; at the same time, the bias circuit is removed in view of the voltage-controlled oscillator , which eliminates the phase noise generated by the bias circuit, thus reducing the phase noise.

FIG. 3 shows the functional modules of the voltage-controlled oscillator provided by the second embodiment of the present invention. For the convenience of description, only the part related to the embodiment of the present invention is shown, and the details are as follows:

As shown in Figure 3, the voltage-controlled oscillator is connected to the power supply terminal Vdd and the ground terminal GND respectively. The voltage-controlled oscillator includes:

a ring oscillation module 101, a frequency adjustment module 102 and a gain adjustment module 103;

The first terminal ① of the gain adjustment module 103 and the first terminal ① of the ring oscillation module 101 are connected to the power supply terminal Vdd, and the second terminal ② of the gain adjustment module 103 and the second terminal ② of the ring oscillation module 101 are connected to the frequency adjustment The first end ① of the module 102; the second end ② of the frequency adjustment module 102 is connected to the ground terminal GND;

The third terminal ③ of the ring oscillator module 101 is the output terminal of the ring oscillator module 101 , the third terminal ③ of the frequency adjustment module 102 is connected to the control voltage Vcnt, and the third terminal ③ of the gain adjustment module 103 is connected to the automatic adjustment of the phase-locked loop frequency synthesizer controller;

The ring oscillation module 101 is used to generate the oscillation signal of the voltage-controlled oscillator;

a frequency adjustment module 102, configured to adjust the output frequency of the oscillation signal of the voltage controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage Vcnt;

The gain adjustment module 103 is configured to adjust the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator according to the reference clock control signal FSWCODE output by the adjustment controller in a manner not less than the second adjustment accuracy.

The voltage-controlled oscillator provided by the embodiment of the present invention is suitable for the situation that the output frequency of the voltage-controlled oscillator oscillation signal of the phase-locked loop frequency synthesizer needs to increase with the increase of the control voltage Vcnt, and the voltage of the power supply terminal Vdd is very low.

In the embodiment of the present invention, the voltage controlled oscillator includes a ring oscillation module 101, a frequency adjustment module 102 and a gain adjustment module 103. The first end ① of the gain adjustment module 103 and the first end ① of the ring oscillation module 101 are connected to the power supply in common Terminal Vdd, the second terminal ② of the gain adjustment module 103 and the second terminal ② of the ring oscillation module 101 are connected to the first terminal ① of the frequency adjustment module 102; the second terminal ② of the frequency adjustment module 102 is connected to the ground terminal GND ring oscillator The third terminal ③ of the module 101 is the output terminal of the ring oscillator module 101, the third terminal ③ of the frequency adjustment module 102 is connected to the control voltage Vcnt, and the third terminal ③ of the gain adjustment module 103 is connected to the automatic adjustment controller of the phase-locked loop frequency synthesizer . In this embodiment of the present invention, the frequency adjustment module 102 may adjust the output frequency of the voltage-controlled oscillator oscillation signal in a manner not greater than the first adjustment accuracy according to the control voltage Vcnt; the gain adjustment module 103 may adjust the reference clock control signal FSWCODE output by the adjustment controller to The output frequency of the oscillation signal of the voltage-controlled oscillator and the gain of the voltage-controlled oscillator are adjusted in a way not less than the second adjustment accuracy, so the gain deviation can be reduced; at the same time, since the voltage-controlled oscillator removes the bias circuit, the generation of the bias circuit is eliminated. phase noise, so the phase noise can be reduced.

FIG. 4 shows the functional modules of the voltage-controlled oscillator provided by the third embodiment of the present invention. For the convenience of description, only the part related to the embodiment of the present invention is shown, and the details are as follows:

As shown in Figure 4, the voltage-controlled oscillator is connected to the power supply terminal Vdd and the ground terminal GND respectively. The voltage-controlled oscillator includes:

a ring oscillation module 101, a frequency adjustment module 102 and a gain adjustment module 103;

The first end ① of the gain adjustment module 103 and the first end ① of the frequency adjustment module 102 are commonly connected to the power supply terminal Vdd, and the second end ② of the gain adjustment module 103 and the second end ② of the frequency adjustment module 102 are commonly connected to the ring oscillator The first end ① of the module 101 and the second end ② of the ring oscillator module 101 are connected to the ground terminal GND;

The third terminal ③ of the ring oscillator module 101 is the output terminal of the ring oscillator module 101 , the third terminal ③ of the frequency adjustment module 102 is connected to the control voltage Vcnt, and the third terminal ③ of the gain adjustment module 103 is connected to the automatic adjustment of the phase-locked loop frequency synthesizer controller;

The ring oscillation module 101 is used to generate the oscillation signal of the voltage-controlled oscillator;

a frequency adjustment module 102, configured to adjust the output frequency of the oscillation signal of the voltage controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage Vcnt;

The gain adjustment module 103 is configured to adjust the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator according to the reference clock control signal FSWCODE output by the adjustment controller in a manner not less than the second adjustment accuracy.

The voltage-controlled oscillator provided by the embodiment of the present invention is suitable for: the output frequency of the voltage-controlled oscillator oscillation signal of the phase-locked loop frequency synthesizer is required to decrease with the increase of the control voltage Vcnt, and the voltage of the power supply terminal Vdd is not very low. Happening.

In the embodiment of the present invention, the voltage controlled oscillator includes a ring oscillation module 101, a frequency adjustment module 102 and a gain adjustment module 103. The first end ① of the gain adjustment module 103 and the first end ① of the frequency adjustment module 102 are connected to the power supply in common terminal Vdd, the second terminal ② of the gain adjustment module 103 and the second terminal ② of the frequency adjustment module 102 are connected to the first terminal ① of the ring oscillation module 101, and the second terminal ② of the ring oscillation module 101 is connected to the ground terminal GND; The third terminal ③ of the oscillation module 101 is the output terminal of the ring oscillation module 101 , the third terminal ③ of the frequency adjustment module 102 is connected to the control voltage Vcnt, and the third terminal ③ of the gain adjustment module 103 is connected to the automatic adjustment control of the phase-locked loop frequency synthesizer device. In this embodiment of the present invention, the frequency adjustment module 102 may adjust the output frequency of the voltage-controlled oscillator oscillation signal in a manner not greater than the first adjustment accuracy according to the control voltage Vcnt; the gain adjustment module 103 may adjust the reference clock control signal FSWCODE output by the adjustment controller to The output frequency of the oscillation signal of the voltage-controlled oscillator and the gain of the voltage-controlled oscillator are adjusted in a way not less than the second adjustment accuracy, so the gain deviation can be reduced; at the same time, since the voltage-controlled oscillator removes the bias circuit, the generation of the bias circuit is eliminated. phase noise, so the phase noise can be reduced.

FIG. 5 shows the functional modules of the voltage-controlled oscillator provided by the fourth embodiment of the present invention. For the convenience of description, only the part related to the embodiment of the present invention is shown, and the details are as follows:

As shown in Figure 5, the voltage-controlled oscillator is connected to the power supply terminal Vdd and the ground terminal GND respectively. The voltage-controlled oscillator includes:

a ring oscillation module 101, a frequency adjustment module 102 and a gain adjustment module 103;

The first terminal ① of the frequency adjustment module 102 is connected to the power supply terminal Vdd, the second terminal ② of the frequency adjustment module 102 and the first terminal ① of the gain adjustment module 103 are jointly connected to the first terminal ① of the ring oscillation module 101 , and the gain adjustment module 103 The second terminal ② of the ring oscillator module 101 is connected to the ground terminal GND in common with the second terminal ② of the ring oscillator module 101 ;

The third terminal ③ of the ring oscillator module 101 is the output terminal of the ring oscillator module 101 , the third terminal ③ of the frequency adjustment module 102 is connected to the control voltage Vcnt, and the third terminal ③ of the gain adjustment module 103 is connected to the automatic adjustment of the phase-locked loop frequency synthesizer controller;

The ring oscillation module 101 is used to generate the oscillation signal of the voltage-controlled oscillator;

a frequency adjustment module 102, configured to adjust the output frequency of the oscillation signal of the voltage controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage Vcnt;

The gain adjustment module 103 is configured to adjust the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator according to the reference clock control signal FSWCODE output by the adjustment controller in a manner not less than the second adjustment accuracy.

The voltage-controlled oscillator provided by the embodiment of the present invention is suitable for: the output frequency of the voltage-controlled oscillator oscillation signal of the phase-locked loop frequency synthesizer is required to decrease with the increase of the control voltage Vcnt, and the voltage of the power supply terminal Vdd is very low. .

In the embodiment of the present invention, the voltage-controlled oscillator includes a ring oscillation module 101, a frequency adjustment module 102 and a gain adjustment module 103. The first end of the frequency adjustment module 102 ① is connected to the power supply terminal Vdd, and the second end of the frequency adjustment module 102 ② The first end ① of the gain adjustment module 103 is connected to the first end ① of the ring oscillation module 101 , and the second end ② of the gain adjustment module 103 is connected to the ground terminal GND with the second end ② of the ring oscillation module 101 ; The third terminal ③ of the oscillation module 101 is the output terminal of the ring oscillation module 101 , the third terminal ③ of the frequency adjustment module 102 is connected to the control voltage Vcnt, and the third terminal ③ of the gain adjustment module 103 is connected to the automatic adjustment control of the phase-locked loop frequency synthesizer . In this embodiment of the present invention, the frequency adjustment module 102 may adjust the output frequency of the voltage-controlled oscillator oscillation signal in a manner not greater than the first adjustment accuracy according to the control voltage Vcnt; the gain adjustment module 103 may adjust the reference clock control signal FSWCODE output by the adjustment controller to The output frequency of the oscillation signal of the voltage-controlled oscillator and the gain of the voltage-controlled oscillator are adjusted in a way not less than the second adjustment accuracy, so the gain deviation can be reduced; at the same time, since the voltage-controlled oscillator removes the bias circuit, the generation of the bias circuit is eliminated. phase noise, so the phase noise can be reduced.

Wherein, the output frequency of the oscillation signal of the voltage-controlled oscillator described in the above embodiment is determined by the following formula:

Among them, f represents the output frequency of the oscillating signal of the voltage controlled oscillator, I represents the current consumed by the ring oscillation module 101, C ₀ represents the equivalent capacitance C of each node of the ring oscillation module 101, and Vs represents the amplitude of the oscillating signal of the ring oscillation module 101 value, N represents the trimming code, Vdd represents the Vdd voltage of the power supply terminal, R represents the resistance value of the resistor R (refer to the following related embodiments) shown in the gain adjustment module 103 , and uCox represents the current carrying of the MOS transistor in the ring oscillation module 101 Mobility of the ions, W represents the width of the MOS transistor in the ring oscillation module 101 , L represents the length of the MOS transistor in the ring oscillation module 101 , Vcnt represents the control voltage of the voltage-controlled oscillator, and Vth represents the MOS transistor in the ring oscillation module 101 threshold voltage. The carrier mobility, width, length and threshold voltage of all MOS transistors in the ring oscillation module 101 are the same.

The gain of the VCO can be determined by the following formula:

Among them, M represents the gain of the voltage-controlled oscillator, Δf represents the variation of the output frequency of the voltage-controlled oscillator oscillation signal, and ΔVcnt represents the variation of the voltage-controlled oscillator control voltage Vcnt.

It can be known from the above formulas (1) to (3) that the trimming code N can not only automatically correct the output frequency of the oscillation signal of the voltage-controlled oscillator according to the process deviation, but also automatically correct the gain of the voltage-controlled oscillator according to the process deviation. Compared with the prior art, the gain deviation can be reduced.

The control voltage Vcnt of the voltage-controlled oscillator is used to adjust the output frequency of the oscillation signal of the voltage-controlled oscillator in a manner not greater than the first adjustment accuracy. When the control voltage Vcnt of the VCO increases, the output frequency of the oscillation signal of the VCO will increase with the increase of the control voltage Vcnt of the VCO; when the control voltage Vcnt of the VCO decreases , the output frequency of the VCO oscillation signal will decrease with the decrease of the VCO control voltage Vcnt.

In addition, the reference clock control signal FSWCODE output by the adjustment controller of the phase-locked loop frequency synthesizer is used to adjust the output frequency of the oscillation signal of the voltage-controlled oscillator in a manner not less than the second adjustment accuracy, and the gain of the voltage-controlled oscillator will also be Automatic adjustment with reference clock control signal FSWCODE. In the embodiment of the present invention, when the reference clock control signal FSWCODE is <00000>, the output frequency of the voltage-controlled oscillator oscillation signal is the lowest; when the reference clock control signal FSWCODE is <11111>, the output frequency of the voltage-controlled oscillator oscillation signal is The frequency is the highest, and its specific value is automatically calculated and output by the adjustment controller of the phase-locked loop frequency synthesizer according to the process and temperature and the change of the target output frequency.

In addition, when the control voltage of the voltage-controlled oscillator Vcnt=0, the noise voltage generated by the self-bias voltage of the voltage-controlled oscillator is:

And the noise voltage generated by the VCO in the prior art is:

表示压控振荡器的噪声电压，K表示玻尔兹曼常数，T表示开尔文温度，R表示增益调整模块103中所示电阻R(参见下述相关实施例)的阻值，gm表示环形振荡模块101中MOS管的跨导，r₀表示环形振荡模块101中MOS管的输出电阻，A表示与工艺有关的常量，Cox表示表示环形振荡模块101中MOS管单位gate面积的有效电容，W表示表示环形振荡模块101中MOS管的宽度，L表示表示环形振荡模块101中MOS管的长度，f表示压控振荡器振荡信号的输出频率。其中，环形振荡模块101中所有MOS管的载流子迁移率、宽度、长度及阈值电压均一致。in,

represents the noise voltage of the voltage-controlled oscillator, K represents the Boltzmann constant, T represents the Kelvin temperature, R represents the resistance value of the resistor R shown in the gain adjustment module 103 (see related embodiments below), and gm represents the ring oscillation module The transconductance of the MOS transistor in 101, r ₀ represents the output resistance of the MOS transistor in the ring oscillation module 101, A represents a process-related constant, Cox represents the effective capacitance per unit gate area of the MOS transistor in the ring oscillation module 101, and W represents the The width of the MOS transistor in the ring oscillation module 101, L represents the length of the MOS transistor in the ring oscillation module 101, and f represents the output frequency of the voltage-controlled oscillator oscillation signal. The carrier mobility, width, length and threshold voltage of all MOS transistors in the ring oscillation module 101 are the same.

It can be seen that under the condition that the output frequency of the oscillating signal of the VCO is the same, the noise of the existing VCO is larger. The last two items in the formula (6) are the heat generated by the MOS tube of the bias current source respectively. Noise and Flicker noise, these two noises are almost completely removed in the voltage-controlled oscillator provided by the embodiment of the present invention.

FIG. 6 shows the functional modules of the voltage-controlled oscillator provided by the fifth embodiment of the present invention. For the convenience of description, only the part related to the embodiment of the present invention is shown, and the details are as follows:

In an embodiment of the present invention, in order to improve the stability of the output frequency of the oscillation signal of the voltage controlled oscillator, as shown in FIG. 6 , on the basis of the voltage controlled oscillator shown in any of the above-mentioned FIGS. The VCO also includes:

The filter module 104, the first end of the filter module 104 ① is connected to the first end of the ring oscillation module 101 ①, the second end of the filter module 104 ② is connected to the second end of the ring oscillation module 101 ②, and the filter module 104 is used to stabilize the ring oscillation Module 101 voltage.

Wherein, as shown in FIG. 11 , the filter module 104 includes a capacitor C, and the first end ① and the second end ② of the capacitor C are the first end ① and the second end ② of the filter module 104 respectively, and the capacitor C is used for The voltage of the ring oscillation module 101 is stabilized, and the phase noise of the oscillation signal output by the voltage controlled oscillator is reduced.

In the embodiment of the present invention, the voltage-controlled oscillator further includes a filtering module 104, which can improve the stability of the output frequency of the oscillation signal of the voltage-controlled oscillator.

In an embodiment of the present invention, in order to adjust the sine wave into a rectangular wave, as shown in FIG. 5 , on the basis of the voltage-controlled oscillator shown above, the voltage-controlled oscillator further includes:

The waveform shaping module 105, the first terminal ① of the waveform shaping module 105 and the first terminal ① of the ring oscillation module 101 are connected to the power supply terminal Vdd, and the second terminal ② of the waveform shaping module 105 is connected to the third terminal of the ring oscillation module 101 ③, the third terminal ③ of the waveform shaping module 105 is the output terminal of the voltage-controlled oscillator;

The waveform shaping module 105 is used to adjust the sine wave output by the ring oscillation module 101 into a rectangular wave output.

In the embodiment of the present invention, the voltage-controlled oscillator further includes a waveform shaping module 105, which can adjust the sine wave output by the ring oscillation module 101 into a rectangular wave output.

7 shows a schematic structural diagram of a ring oscillation module 101 in a voltage-controlled oscillator provided by an embodiment of the present invention, and FIGS. 10 to 11 show a circuit structure of the voltage-controlled oscillator provided by an embodiment of the present invention. For the convenience of description, Only the parts related to the embodiments of the present invention are shown, and the details are as follows:

As shown in FIG. 7 , FIG. 10 and FIG. 11 , the ring oscillation module 101 includes: a first MOS transistor MP1 , a second MOS transistor MP2 , a second three MOS transistor MP3 , a fourth MOS transistor MN4 , and a fifth MOS transistor MN5 and the sixth MOS transistor MN6.

The source of the first MOS transistor MP1, the source of the second MOS transistor MP2 and the source of the second three MOS transistors MP3 are connected together to form the first end ① of the ring oscillation module 101, the gate of the first MOS transistor MP1, the The drain of the second MOS transistor MP2 and the gate of the fourth MOS transistor MN4 are commonly connected to the drain of the fifth MOS transistor MN5, the gate of the second MOS transistor MP2, the drain of the second three MOS transistor MP3, and the fifth MOS transistor The gate of the transistor MN5 is connected to the drain of the sixth MOS transistor MN6, the source of the fourth MOS transistor MN4, the source of the fifth MOS transistor MN5 and the source of the sixth MOS transistor MN6 are connected together to form a ring oscillation module 101 The second end ② of the first MOS transistor MP1, the gate of the second three MOS transistor MP3, the drain of the fourth MOS transistor MN4 and the gate of the sixth MOS transistor MN6 are connected together to form the ring oscillation module 101. The third end ③.

8 shows a schematic structural diagram of the frequency adjustment module 102 in the voltage-controlled oscillator provided by the embodiment of the present invention, and FIGS. 10 to 11 show the circuit structure of the voltage-controlled oscillator provided by the embodiment of the present invention. For convenience of description, only The parts related to the embodiments of the present invention are shown, and the details are as follows:

As shown in FIG. 8 , FIG. 10 and FIG. 11 , the frequency adjustment module 102 includes: a seventh MOS transistor MN7 and an eighth MOS transistor MN8 .

The gate of the seventh MOS transistor MN7 is the first end ① of the frequency adjustment module 102 , the source of the seventh MOS transistor MN7 is connected to the gate of the eighth MOS transistor MN8 , and the source of the eighth MOS transistor MN8 is the first terminal of the frequency adjustment module 102 . Two terminals ②, the drain of the seventh MOS transistor MN7 is the third terminal ③ of the frequency adjustment module 102 .

The seventh MOS transistor MN7 is used to generate the gain of the voltage controlled oscillator; the eighth MOS transistor MN8 is used to control the gain of the voltage controlled oscillator.

FIG. 9 shows a schematic structural diagram of the gain adjustment module 103 in the voltage-controlled oscillator provided by the embodiment of the present invention. For convenience of description, FIGS. 10 to 11 show the circuit structure of the voltage-controlled oscillator provided by the embodiment of the present invention. Only The parts related to the embodiments of the present invention are shown, and the details are as follows:

As shown in FIG. 9 to FIG. 11 , the gain adjustment module 103 includes a ninth MOS transistor MN9 and a resistor R.

The gate of the ninth MOS transistor MN9 is the first terminal ① of the gain adjustment module 103 , the source of the ninth MOS transistor MN9 is connected to the first terminal ① of the resistor R, and the second terminal ② of the resistor R is the second terminal ② of the gain adjustment module 103 . Terminal ②, the drain of the ninth MOS transistor MN9 is the third terminal ③ of the gain adjustment module 103 .

The ninth MOS transistor MN9 is used to adjust the output frequency of the oscillation signal of the voltage controlled oscillator in a manner not less than the second adjustment accuracy according to the reference clock control signal FSWCODE output by the adjustment controller.

FIG. 12 shows a phase-locked loop frequency synthesizer provided by an embodiment of the present invention. For convenience of description, only the part related to the embodiment of the present invention is shown, and the details are as follows:

As shown in FIG. 12 , the phase-locked loop frequency synthesizer includes the voltage-controlled oscillator 1201 described in any of the above-mentioned embodiments, and further includes a lock judgment circuit 1202, an automatic adjustment controller 1203, a phase detector/charge pump 1204, Filter 1205 and divider 1206. The lock judgment circuit 1202 is respectively connected to the automatic adjustment controller 1203 and the phase detector/charge pump 1204, the filter 1205 is respectively connected to the phase detector/charge pump 1204 and the voltage controlled oscillator 1201, and the automatic adjustment controller 1203 is connected to the voltage controlled oscillator 1201 , the frequency divider 1206 is connected to the phase detector/charge pump 1204 and the voltage controlled oscillator 1201 respectively. The phase detector/charge pump 1204 receives the input reference clock control signal FSWCODE, and the voltage controlled oscillator 1201 outputs a synthesized clock.

The mechanism and process of adjusting the output frequency of the voltage-controlled oscillator 1201 with reference to the clock control signal FSWCODE are as follows:

After the phase-locked loop frequency synthesizer is powered on and reset is released, the initial value of the reference clock control signal FSWCODE is set to 000000, wait for an appropriate time, and when the phase-locked loop frequency synthesizer loop is stable, detect the output state of the lock judgment circuit 1202, if locked If the output of the judgment circuit 1202 is 1, it means that the phase-locked loop frequency synthesizer loop has been locked. At this time, the comparator in the automatic adjustment controller 1203 is used to further confirm whether the result of the comparison between Vcnt and the reference voltage COMPOUT is 0. If the result is 0, it means that Vcnt works in a controllable state in the locked state, the synthesized clock reaches the target frequency value, and the frequency adjustment process of the phase-locked loop frequency synthesizer ends. If the aforementioned lock judgment circuit is still equal to 0, or the result of the comparison between Vcnt and the reference voltage is COMPOUT=1, it means that the frequency of the synthesized clock is not adjusted to the target frequency value, or Vcnt is not working in a controllable state. At this time, the reference clock control signal FSWCODE is automatically Add 1, wait for an appropriate time, wait for the phase-locked loop frequency synthesizer loop to stabilize, and repeat the previous detection process. The following Tables 1 and 2 show the comparison of the parameters and effects of the voltage-controlled oscillator provided by the embodiment of the present invention and the existing voltage-controlled oscillator:

Table 1 Some technical indicators of VCO

Among them, Kvco represents the gain of the voltage-controlled ring oscillator, PhaseNoise represents the phase noise, the smaller the better; Power represents the consumption current of the object module, the smaller the better; Size represents the occupied area of the object module, the smaller the better; VDD represents the minimum operating voltage of the subject module, the smaller the better; Output Frequency represents the synthesizable frequency range, the wider the better.

Table 2 Effects of some technical indicators of VCO

Among them, Kvco@16GHz represents the gain when the output frequency of the VCO is 16GHz, and KvcoVariation@16GHz represents the deviation of the gain of the boundary condition relative to the gain of the typical condition. The smaller the deviation, the better. TT represents the typical process angle in chip manufacturing, and SS/FF represents the boundary process angle in chip manufacturing.

To sum up, in the embodiment of the present invention, the voltage-controlled oscillator includes a ring oscillation module 101 , a frequency adjustment module 102 and a gain adjustment module 103 . The first terminal of the ring The second terminal ② is connected to the first terminal ① of the frequency adjustment module 102 and the first terminal ① of the gain adjustment module 103 respectively; the third terminal ③ of the ring oscillation module 101 is the output terminal of the ring oscillation module 101 ; The two terminals ② and the second terminal ② of the gain adjustment module 103 are commonly connected to the ground terminal GND; the third terminal ③ of the frequency adjustment module 102 is connected to the control voltage Vcnt, and the third terminal ③ of the gain adjustment module 103 is connected to the phase-locked loop frequency synthesizer adjustment controller. In this embodiment of the present invention, the frequency adjustment module 102 may adjust the output frequency of the voltage-controlled oscillator oscillation signal in a manner not greater than the first adjustment accuracy according to the control voltage Vcnt; the gain adjustment module 103 may adjust the reference clock control signal FSWCODE output by the adjustment controller to The output frequency of the oscillation signal of the voltage-controlled oscillator and the gain of the voltage-controlled oscillator are adjusted in a way not less than the second adjustment accuracy, so the gain deviation can be reduced; at the same time, since the voltage-controlled oscillator removes the bias circuit, the generation of the bias circuit is eliminated. phase noise, so the phase noise can be reduced.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above-mentioned specific embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A voltage-controlled oscillator, characterized in that, a power supply terminal and a ground terminal are respectively connected, and the voltage-controlled oscillator comprises: Ring oscillation module, frequency adjustment module and gain adjustment module; The first end of the ring oscillation module is connected to the power supply end, the second end of the ring oscillation module is respectively connected to the first end of the frequency adjustment module and the first end of the gain adjustment module; the third end of the ring oscillation module is the output end of the ring oscillation module ; The second end of the frequency adjustment module and the second end of the gain adjustment module are connected to the grounding end in common; the third end of the frequency adjustment module is connected to the control voltage, and the third end of the gain adjustment module is connected to the adjustment controller of the phase-locked loop frequency synthesizer; Ring oscillation module, used to generate the oscillation signal of the voltage-controlled oscillator; a frequency adjustment module, configured to adjust the output frequency of the oscillation signal of the voltage-controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage; The gain adjustment module is used for adjusting the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator in a manner not less than the second adjustment accuracy according to the reference clock control signal output by the adjustment controller. 2. A voltage-controlled oscillator, characterized in that, a power supply terminal and a ground terminal are respectively connected, and the voltage-controlled oscillator comprises: Ring oscillation module, frequency adjustment module and gain adjustment module; The first end of the gain adjustment module and the first end of the ring oscillation module are connected to the power supply end, and the second end of the gain adjustment module and the second end of the ring oscillation module are connected to the first end of the frequency adjustment module; the frequency adjustment module The second terminal is connected to the ground terminal; The third end of the ring oscillation module is the output end of the ring oscillation module, the third end of the frequency adjustment module is connected to the control voltage, and the third end of the gain adjustment module is connected to the automatic adjustment controller of the phase-locked loop frequency synthesizer; Ring oscillation module, used to generate the oscillation signal of the voltage-controlled oscillator; a frequency adjustment module, configured to adjust the output frequency of the oscillation signal of the voltage-controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage; The gain adjustment module is used for adjusting the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator in a manner not less than the second adjustment accuracy according to the reference clock control signal output by the adjustment controller. 3. A voltage-controlled oscillator, characterized in that a power supply terminal and a ground terminal are respectively connected, and the voltage-controlled oscillator comprises: Ring oscillation module, frequency adjustment module and gain adjustment module; The first end of the gain adjustment module and the first end of the frequency adjustment module are connected to the power supply end, the second end of the gain adjustment module and the second end of the frequency adjustment module are connected to the first end of the ring oscillation module, and the The second terminal is connected to the ground terminal; The third end of the ring oscillation module is the output end of the ring oscillation module, the third end of the frequency adjustment module is connected to the control voltage, and the third end of the gain adjustment module is connected to the automatic adjustment controller of the phase-locked loop frequency synthesizer; Ring oscillation module, used to generate the oscillation signal of the voltage-controlled oscillator; a frequency adjustment module, configured to adjust the output frequency of the oscillation signal of the voltage-controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage; The gain adjustment module is used for adjusting the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator in a manner not less than the second adjustment accuracy according to the reference clock control signal output by the adjustment controller. 4. A voltage-controlled oscillator, characterized in that a power supply terminal and a ground terminal are respectively connected, and the voltage-controlled oscillator comprises: Ring oscillation module, frequency adjustment module and gain adjustment module; The first end of the frequency adjustment module is connected to the power supply end, the second end of the frequency adjustment module and the first end of the gain adjustment module are connected to the first end of the ring oscillation module, and the second end of the gain adjustment module is connected to the second end of the ring oscillation module The terminals are connected to the ground terminal in common; The third end of the ring oscillation module is the output end of the ring oscillation module, the third end of the frequency adjustment module is connected to the control voltage, and the third end of the gain adjustment module is connected to the automatic adjustment controller of the phase-locked loop frequency synthesizer; Ring oscillation module, used to generate the oscillation signal of the voltage-controlled oscillator; a frequency adjustment module, configured to adjust the output frequency of the oscillation signal of the voltage-controlled oscillator in a manner not greater than the first adjustment accuracy according to the control voltage; The gain adjustment module is used for adjusting the output frequency of the voltage-controlled oscillator oscillation signal and the gain of the voltage-controlled oscillator in a manner not less than the second adjustment accuracy according to the reference clock control signal output by the adjustment controller. 5. The voltage-controlled oscillator according to any one of claims 1 to 4, characterized in that, further comprising: a filter module, the first end of the filter module is connected to the first end of the ring oscillation module, and the second end of the filter module is connected to the second end of the ring oscillation module; The filter module is used to stabilize the voltage of the ring oscillator module. 6. The voltage-controlled oscillator according to any one of claims 1 to 4, characterized in that, further comprising: The waveform shaping module, the first end of the waveform shaping module and the first end of the ring oscillation module are connected to the power supply end, the second end of the waveform shaping module is connected to the third end of the ring oscillation module, and the third end of the waveform shaping module is The output of the voltage-controlled oscillator; The waveform shaping module is used to adjust the sine wave output by the ring oscillator module into a rectangular wave output. 7. The voltage-controlled oscillator according to any one of claims 1 to 4, wherein the ring oscillation module comprises: The first MOS tube, the second MOS tube, the third MOS tube, the fourth MOS tube, the fifth MOS tube and the sixth MOS tube; The source of the first MOS transistor, the source of the second MOS transistor and the source of the third MOS transistor are connected together to form the first end of the ring oscillation module. The gate of the first MOS transistor, the drain of the second MOS transistor, The gate of the fourth MOS transistor is connected to the drain of the fifth MOS transistor, the gate of the second MOS transistor, the drain of the third MOS transistor, and the gate of the fifth MOS transistor are connected to the drain of the sixth MOS transistor. pole, the source of the fourth MOS transistor, the source of the fifth MOS transistor and the source of the sixth MOS transistor are connected together to form the second end of the ring oscillation module, the drain of the first MOS transistor, the gate of the third MOS transistor The electrode, the drain of the fourth MOS transistor and the gate of the sixth MOS transistor are commonly connected to form the third end of the ring oscillation module. 8. The voltage-controlled oscillator according to any one of claims 1 to 4, wherein the frequency adjustment module comprises: The seventh MOS tube and the eighth MOS tube; The gate of the seventh MOS transistor is the first end of the frequency adjustment module, the source of the seventh MOS transistor is connected to the gate of the eighth MOS transistor, the source of the eighth MOS transistor is the second end of the frequency adjustment module, and the seventh MOS transistor The drain is the third terminal of the frequency adjustment module; The seventh MOS tube is used to generate the gain of the voltage-controlled oscillator; The eighth MOS tube is used to control the gain of the voltage-controlled oscillator. 9. The voltage-controlled oscillator according to any one of claims 1 to 4, wherein the gain adjustment module comprises: The ninth MOS tube and resistor; The gate of the ninth MOS transistor is the first end of the gain adjustment module, the source of the ninth MOS transistor is connected to the first end of the resistor, the second end of the resistor is the second end of the gain adjustment module, and the drain of the ninth MOS transistor is The third end of the gain adjustment module; The ninth MOS transistor is used to adjust the output frequency of the oscillation signal of the voltage controlled oscillator in a manner not less than the second adjustment accuracy according to the reference clock control signal output by the adjustment controller. 10. A phase-locked loop frequency synthesizer, comprising the voltage-controlled oscillator according to any one of claims 1 to 9.

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