CN118100990A - Method for driving forward branch output stage in forward de-emphasis circuit in receiver - Google Patents
Method for driving forward branch output stage in forward de-emphasis circuit in receiver Download PDFInfo
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- CN118100990A CN118100990A CN202410510259.4A CN202410510259A CN118100990A CN 118100990 A CN118100990 A CN 118100990A CN 202410510259 A CN202410510259 A CN 202410510259A CN 118100990 A CN118100990 A CN 118100990A
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- 238000004891 communication Methods 0.000 abstract description 7
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
- H03K5/12—Shaping pulses by steepening leading or trailing edges
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1607—Supply circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/32—Reducing cross-talk, e.g. by compensating
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Abstract
The invention discloses a forward branch output stage driving method in a forward de-emphasis circuit in a receiver. In order to solve the technical problems of reducing forward crosstalk and increasing the reliability of a system when the overall power consumption of a circuit is high, the invention detects whether a forward de-emphasis function is started in real time; if yes, the power supply voltage of the forward branch output stage driving circuit normally supplies power, the first tail current source of the forward branch output stage driving circuit is normally opened, and the forward de-emphasis circuit is in a normal working state; if not, the forward branch output stage driving circuit cuts off the power supply voltage and turns off the first tail current source, and at the moment, the output voltage of the forward branch output stage driving circuit selects the ground level as the output voltage value of the forward branch output stage driving circuit. The invention has low power consumption, can effectively identify whether the forward de-emphasis function is started, and has high implementation performance and reliability. The invention is suitable for the field of high-speed wired communication.
Description
Technical Field
The invention relates to the field of high-speed wired communication, in particular to a forward branch output stage driving method in a forward de-emphasis circuit in a receiver.
Background
Serializers and deserializers (Serializer and Deserializer, serDes) are common high-speed wired communication technologies. The SerDes technique typically requires link equalization, while the de-emphasis technique, the pre-emphasis technique, is a link equalization method commonly used to implement a feedback decision equalizer (Decision Feedback Equalizer, DFE) and a forward feedback equalizer (Feed Forward Equalizer, FFE). Further, the weighting technique can be divided into: the forward de-emphasis, the forward pre-emphasis, the backward de-emphasis and the backward pre-emphasis are respectively used for solving the problems of forward crosstalk and backward crosstalk in a communication link. The present invention is directed to forward de-emphasis techniques in DFE or FFE.
The high-speed signal is greatly influenced by skin effect, transmission line dielectric loss, reflection and other reasons in the transmission process, and serious forward crosstalk can be generated, and the residual state of the signal at the previous moment can influence the current signal amplitude and influence the communication quality.
The forward de-emphasis technology is a common forward crosstalk compensation technology, and compensates for damaged high-frequency signals under the condition of higher overall power consumption of a circuit, so that a better waveform can be obtained at a receiving terminal.
Fig. 1 is a prior art forward de-emphasis circuit of a current-mode structure. The current mode structure is a preferred structure of the high-speed wired communication circuit, and the logic value is represented by controlling the magnitude of the current, so that the quick response and the low power consumption can be realized. The forward de-emphasis circuit comprises a main circuit driving circuit, a forward branch circuit driving circuit and a de-superposition addition circuit, wherein an input signal forms a phase advance with the output of the main circuit output stage driving circuit through the forward branch circuit driving circuit, then the output of the forward branch circuit output stage driving circuit is inverted, and then the signal output by the forward branch circuit output stage driving circuit is synthesized through a de-emphasis synthesis circuit, so that the backward de-emphasis function is realized.
However, when the forward de-emphasis function is turned off, if the tail current source of the forward branch output stage driving circuit is turned off completely, the output common mode point of the forward branch output stage driving circuit is pulled up to the power supply voltage (Volt Current Condenser, VCC), so that an input tube coupled with the output of the forward branch driving circuit in the de-emphasis synthesis circuit is biased to a switching state, and if the input tube is not processed, conduction between differential output ends of the de-emphasis synthesis circuit is caused, so that the output signal quality is seriously affected.
In the prior art, when the forward de-emphasis function is closed, only the tail current of a front stage driving circuit in a forward branch driving circuit is closed, the tail current of an output stage driving circuit in a branch is kept open, and a voltage dividing resistor is added between a power supply and an output load resistor of the forward branch output stage driving circuit to reduce the output common mode point voltage, so that the output voltage of the driving circuit is reduced by using the voltage drop generated on the resistor, thereby ensuring that an input tube of a forward branch signal in a de-emphasis synthesis circuit is biased to a cut-off state, and fig. 2 is a schematic diagram of the forward branch output stage driving circuit of an improved current mode structure in the prior art. However, this method can cause that the tail current of the forward branch output stage driving circuit must be kept on no matter whether the forward de-emphasis function is on, which not only results in increased circuit power consumption, but also brings difficulty to the heat dissipation design of the chip, resulting in reduced chip reliability.
Therefore, how to design a forward branch output stage driving method in a forward de-emphasis circuit in a receiver to weaken forward crosstalk during high-frequency signal transmission is a technical problem to be solved in the current high-speed wired communication field.
Disclosure of Invention
In order to alleviate or partially alleviate the above technical problem, the solution of the present invention is as follows:
a method for driving a forward branch output stage in a forward de-emphasis circuit in a receiver, comprising the steps of:
Detecting whether a forward de-emphasis function is started or not in real time;
If yes, the power supply voltage of the forward branch output stage driving circuit normally supplies power, the first tail current source of the forward branch output stage driving circuit is normally started, and the forward de-emphasis circuit is in a normal working state;
if not, the forward branch output stage driving circuit cuts off the power supply voltage and turns off the first tail current source, and at the moment, the output selective level of the forward branch output stage driving circuit is used as the output voltage value of the forward branch output stage driving circuit.
Further, the forward de-emphasis circuit is configured to process the signal in the time domain, and to emphasize the amplitude at the signal transition edge, thereby enhancing the high frequency component of the signal in the frequency domain.
Further, the forward branch output stage driving circuit detects the on or off of the forward de-emphasis function in real time by using the forward de-emphasis switching circuit.
Further, when the forward de-emphasis function is detected to be started, the forward de-emphasis switch circuit controls the power switch circuit to be conducted, the first tail current source is turned on, and the forward de-emphasis circuit is in a normal working state;
When the forward de-emphasis function is detected to be turned off, the forward de-emphasis switch circuit sends a control signal to turn off the power switch circuit, turns off the first tail current source, and enables the output selection circuit to select a ground level as an output.
Further, the forward de-emphasis switching circuit includes a voltage comparator;
The voltage comparator compares the control voltage of the tail current source in the forward branch front stage driving circuit with a reference voltage; when the forward de-emphasis function is started, the control voltage of a tail current source in a forward branch front-stage driving circuit is higher than a reference voltage, and a voltage comparator outputs a low level; conversely, when the forward de-emphasis is turned off, the voltage comparator outputs a high level;
The forward branch forward stage driving circuit is a forward stage of the forward branch output stage driving circuit.
Further, the reference voltage is greater than or equal to one-half of the supply voltage and less than the supply voltage.
Further, the output of the voltage comparator is shaped with an inverter. The technical scheme of the invention has one or more of the following beneficial technical effects:
(1) The forward de-emphasis switch circuit is introduced into the forward branch output stage driving circuit, so that whether the forward de-emphasis function is started or not can be effectively identified, and the implementation and reliability are high.
(2) When the forward de-emphasis function is closed, the power supply voltage is cut off, and the low level is selected as the output voltage of the forward branch output stage driving circuit, so that the output voltage is not reduced by voltage drop generated on the voltage dividing resistor like the traditional mode, and the mode is simple and the power consumption is lower.
Furthermore, other advantageous effects that the present invention has will be mentioned in the specific embodiments.
Drawings
FIG. 1 is a prior art forward de-emphasis circuit of a current-mode structure;
FIG. 2 is a schematic diagram of a forward branch output stage driving circuit of a prior art modified current mode structure;
FIG. 3 is a schematic diagram of forward de-emphasis;
FIG. 4 is a flow chart of operation of the forward branch output stage driver circuit in the forward de-emphasis circuit;
fig. 5 is a schematic diagram of a forward branch output stage driving circuit according to a preferred embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, in order to facilitate the clear description of the technical solution of the embodiments of the present invention, in the embodiments of the present invention, the words "first", "second", etc. are used to distinguish the same item or similar items having substantially the same function and effect. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ. Meanwhile, the broken lines and the solid lines in the drawings of the present invention each represent a signal coupling line, only to show whether the signal coupling lines are cross-connected or not.
Numerous specific details are set forth in the following description in order to provide a better understanding of the invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, well known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present invention.
And the forward de-emphasis technology processes the signal in the time domain, weakens the signal amplitude except for the falling edge in the forward branch driving circuit, and relatively strengthens the amplitude at the signal jump edge, so that the high-frequency component in the frequency domain is strengthened. Fig. 3 is a schematic diagram of forward de-emphasis, in which the amplitude of the signal in the forward branch is reduced, so that the amplitude of the forward crosstalk is reduced, and the influence of the forward crosstalk on the circuit is reduced. The actual main path signal refers to a main path signal with transmission loss, the ideal main path signal refers to a main path signal without transmission loss, the forward path ideal signal refers to a forward path signal without transmission loss, the actual forward de-emphasis signal refers to a forward de-emphasis signal with transmission loss, and the ideal forward de-emphasis signal refers to a forward de-emphasis signal without transmission loss.
Fig. 4 is a flow chart of operation of the forward branch output stage driver circuit in the forward de-emphasis circuit. The invention detects whether the forward de-emphasis function is started in real time, if so, the power supply voltage of the forward branch output stage driving circuit normally supplies power, and the first tail current source of the forward branch output stage driving circuit is normally started, so that the forward de-emphasis circuit is in a normal working state. If not, the de-emphasis function is turned off, the forward branch output stage driving circuit turns off the power supply voltage and turns off the first tail current source, and at this time, the output of the forward branch output stage driving circuit selects a low level as the output voltage value of the forward branch output stage driving circuit. For example, the low level is a ground level.
When the forward de-emphasis function is turned off, the input tube coupled with the forward branch output stage driving circuit in the de-emphasis synthesis circuit is guaranteed to be biased to a cut-off state, and the power consumption is reduced because the first tail current source of the forward branch output stage driving circuit is kept turned off.
Fig. 5 is a schematic diagram of a forward branch output stage driving circuit according to a preferred embodiment of the present invention, which includes a forward de-emphasis switch circuit, a power switch circuit, an output selection circuit, a tail current source switch control circuit, and a current mode driving module.
The forward de-emphasis switch circuit detects the on or off state of the forward de-emphasis function in real time and generates control signals for respectively controlling the power switch circuit, the output selection circuit and the tail current source switch control circuit, such as the power switch circuit control signal, the output selection circuit control signal and the tail current source switch control signal.
The control end of the power switch circuit is coupled with the control signal of the power switch circuit, the input end of the power switch circuit is coupled with the power voltage, the output end of the power switch circuit is coupled with the power supply end of the current mode driving module, and the output end of the power switch circuit is an output common mode point V CM of the forward branch output stage driving circuit. Alternatively, the power switching circuit may be constituted by one PMOS transistor or one transmission gate. After receiving the control signal of the power switch circuit, the PMOS transistor or the transmission gate is turned off to cut off the power supply of the power supply voltage.
The control end of the output selection circuit is coupled with the control signal of the output selection circuit, the first differential input of the output selection circuit is coupled with the differential output of the Gilbert circuit module, the second differential input of the output selection circuit is coupled with the ground, and the differential output of the output selection circuit is the differential output of the forward synthesis circuit, namely the positive output Vout+ of the forward branch output stage driving circuit and the negative output Vout-of the forward branch output stage driving circuit shown in fig. 5.
The control end of the tail current source switch control circuit is coupled with the control signal of the tail current source switch control circuit, and the output end of the tail current source switch control circuit is coupled with the current control end of the current mode driving module and is used for simultaneously controlling the on or off of the first tail current source I 1 in the current mode driving module.
The current mode driving module adopts a differential structure, the differential input of the current mode driving module is the differential input of the forward branch output stage driving circuit, and the differential output of the current mode driving module is the differential output of the forward branch output stage driving circuit. In the embodiment of fig. 5 of the present invention, a metal oxide semiconductor (Metal Oxide Semiconductor, MOS) transistor is used, and a person skilled in the art can replace the MOS transistor with a transistor or other transistors according to the actual design requirements, and similar replacement techniques in the following embodiments are not repeated here. In this embodiment, the first transistor M 1 and the second transistor M 2 are NMOS or NPN transistors, and in other embodiments, the first transistor M 1 and the second transistor M 2 may also be PMOS or PNP transistors, and the connection manners of other elements in the current mode driving module are correspondingly changed.
Specifically, the current-mode driving module includes a first transistor M 1, a second transistor M 2, a first resistor R 1, a second resistor R 2, and a first tail current source I 1.
The control electrode of the first transistor M 1 receives the positive input vin+ in the differential input of the forward branch output stage driving circuit, the first electrode of the first transistor M 1 is coupled to the input end of the first tail current source I 1, the second electrode of the first transistor M 1 is coupled to one end of the first resistor R 1 and serves as the positive output vo+ of the current mode driving module, the other end of the first resistor R 1 is coupled to the output of the power switch circuit, and the output end of the first tail current source I 1 is grounded.
The control electrode of the second transistor M 2 receives the negative input Vin-in the differential input of the forward branch output stage driving circuit, the first electrode of the second transistor M 2 is coupled to the input end of the first tail current source I 1, and the second electrode of the second transistor M 2 is coupled to one end of the second resistor R 2 and is used as the negative output Vo-of the current mode driving module, and the other end of the second resistor R 2 is coupled to the output of the power switch circuit.
Wherein the positive output vo+ of the current-mode driving module and the negative output Vo-of the current-mode driving module constitute a differential output of the current-mode driving module.
The working principle of the forward branch output stage driving circuit of a certain preferred embodiment of the invention is as follows: when the forward de-emphasis function is detected to be closed, the forward de-emphasis switch circuit sends a control signal to enable the power switch circuit to be disconnected and cut off the power voltage. Meanwhile, the forward de-emphasis switch circuit sends a control signal to the output selection circuit and the tail current source switch control circuit, so that the output selection circuit selects low level as circuit output, and the first tail current source I 1 of the forward branch output stage driving circuit is closed, namely the first tail current source I 1 is closed. The differential output of the forward branch output stage driving circuit at this time is a low level of the output selecting circuit. Therefore, when the forward de-emphasis function is turned off, the input tube coupled with the forward branch output stage driving circuit in the de-emphasis synthesis circuit is guaranteed to be biased to the cut-off state, and the power consumption is reduced because the first tail current source I 1 of the forward branch output stage driving circuit is kept turned off.
When the forward de-emphasis function is detected to be started, the forward de-emphasis switch circuit controls the power switch circuit to be conducted, and normal power supply of the power supply voltage is maintained. Meanwhile, control signals are transmitted to the output selection circuit and the tail current source switch control circuit, the positive output Vo & lt+ & gt and the negative output Vo & lt- & gt of the current mode driving module are used as the output of the forward branch output stage driving circuit, and the first tail current source I 1 is turned on to keep the forward branch output driving circuit consistent with the normal working state.
Optionally, in some class of embodiments, the forward de-emphasis switching circuit includes a voltage comparator that compares the control voltage of the first tail current source I 1 of the forward branch pre-stage driving circuit with a reference voltage. When the forward de-emphasis function is turned on, the control voltage of the first tail current source I 1 of the forward branch front stage driving circuit is higher than the reference voltage, the voltage comparator outputs a low level, otherwise, when the forward de-emphasis function is turned off, the voltage comparator outputs a high level.
Optionally, the reference voltage is greater than or equal to VCC/2 and less than VCC.
Optionally, the forward de-emphasis switch circuit includes a first driver, where the first driver is configured to drive a control voltage of the first tail current source I 1 of the forward-branch pre-stage driving circuit and then transmit the drive voltage to the voltage comparator.
Optionally, the output of the voltage comparator is shaped with an inverter.
Optionally, the forward de-emphasis switch circuit includes at least one stage of a second driver for driving an output of the voltage comparator or an output of the inverter to obtain control signals of the forward de-emphasis switch circuit output to the power switch circuit, the output selection circuit and the tail current source switch control circuit.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A method for driving a forward branch output stage in a forward de-emphasis circuit in a receiver, comprising the steps of:
Detecting whether a forward de-emphasis function is started or not in real time;
If yes, the power supply voltage of the forward branch output stage driving circuit normally supplies power, the first tail current source of the forward branch output stage driving circuit is normally started, and the forward de-emphasis circuit is in a normal working state;
if not, the forward branch output stage driving circuit cuts off the power supply voltage and turns off the first tail current source, and at the moment, the output selective level of the forward branch output stage driving circuit is used as the output voltage value of the forward branch output stage driving circuit.
2. The method of driving a forward branch output stage in a forward de-emphasis circuit in a receiver of claim 1, wherein:
The forward de-emphasis circuit is used for processing the signal in the time domain, enhancing the amplitude of the signal jump edge, and thus enhancing the high-frequency component of the signal in the frequency domain.
3. The method of driving a forward branch output stage in a forward de-emphasis circuit in a receiver of claim 2, wherein:
The forward branch output stage driving circuit detects the on or off of the forward de-emphasis function in real time by using the forward de-emphasis switching circuit.
4. A method of driving a forward branch output stage in a forward de-emphasis circuit in a receiver as claimed in claim 3, wherein:
When the starting of the forward de-emphasis function is detected, the forward de-emphasis switch circuit controls the power switch circuit to be conducted, the first tail current source is turned on, and the forward de-emphasis circuit is in a normal working state;
When the forward de-emphasis function is detected to be turned off, the forward de-emphasis switch circuit sends a control signal to turn off the power switch circuit, turns off the first tail current source, and enables the output selection circuit to select a ground level as an output.
5. The method for driving a forward branch output stage in a forward de-emphasis circuit in a receiver as claimed in claim 3 or 4, wherein:
the forward de-emphasis switch circuit comprises a voltage comparator;
The voltage comparator compares the control voltage of the tail current source in the forward branch front stage driving circuit with a reference voltage; when the forward de-emphasis function is started, the control voltage of a tail current source in a forward branch front-stage driving circuit is higher than a reference voltage, and a voltage comparator outputs a low level; conversely, when the forward de-emphasis is turned off, the voltage comparator outputs a high level;
The forward branch forward stage driving circuit is a forward stage of the forward branch output stage driving circuit.
6. The method of driving a forward branch output stage in a forward de-emphasis circuit in a receiver of claim 5, wherein:
the reference voltage is greater than or equal to one-half of the supply voltage and less than the supply voltage.
7. The method of driving a forward branch output stage in a forward de-emphasis circuit in a receiver of claim 6, wherein:
The output of the voltage comparator is shaped with an inverter.
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| CN202410510259.4A CN118100990B (en) | 2024-04-26 | 2024-04-26 | Method for driving forward branch output stage in forward de-emphasis circuit in receiver |
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| CN118100990B (en) | 2024-07-05 |
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