CN111399412A - Function generator based on single chip microcomputer and frequency-voltage conversion chip - Google Patents
Function generator based on single chip microcomputer and frequency-voltage conversion chip Download PDFInfo
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- CN111399412A CN111399412A CN202010218176.XA CN202010218176A CN111399412A CN 111399412 A CN111399412 A CN 111399412A CN 202010218176 A CN202010218176 A CN 202010218176A CN 111399412 A CN111399412 A CN 111399412A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21137—Analog to digital conversion, ADC, DAC
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Abstract
The invention discloses a function generator based on a single chip microcomputer and a frequency-voltage conversion chip, which comprises: the single chip microcomputer system circuit and the frequency-voltage conversion circuit; the singlechip system circuit is used for outputting a frequency pulse signal; the frequency-voltage conversion circuit is connected with the single chip microcomputer system circuit and outputs a corresponding voltage signal according to the frequency pulse signal; the single chip microcomputer system circuit is used for outputting a frequency pulse signal; the frequency-voltage conversion circuit is connected with the single chip microcomputer system circuit, corresponding voltage signals are output according to the frequency pulse signals, the single chip microcomputer system circuit only outputs pulses, and the output mode is single, so that stable output can be obtained; the structure is simple, the cost is low, and simultaneously, the output signal is stable; the invention can be used for realizing voltage waveform signal output.
Description
Technical Field
The invention relates to the field of signal measurement of communication technology, in particular to a function generator based on a single chip microcomputer and a frequency-voltage conversion chip.
Background
Function generators, also called waveform generators, were originally used for measurements, and with the development of communication technology, standard signal generators for measurements have emerged, making them a measuring instrument that can be quantitatively analyzed. The advent of microprocessors, the increasing maturity of analog electronics and digital technology, the signal generator has also been transformed from the original form of discrete or analog integrated circuits to digital circuits, the signal generator basically uses digital circuits instead of mechanical drive, so that the signal generator can also generate variable frequency signals, the waveforms it generates, and the signal generator has also been developed from being able to generate only simple waveforms (sine, square, sawtooth, triangle, etc.) to being able to generate arbitrary waveforms. The design method of the signal generator is also changed greatly along with the development of science and technology. Signal generator technology has developed to date, and many high-performance multifunctional signal generators have appeared. The signal generator has wide application in production practice and scientific fields, and is an important tool in measurement and experiment. However, the existing function generator has a relatively complex structure, high cost and high development cost, and can cause the situation of cost waste in low-requirement occasions.
Disclosure of Invention
The invention aims to provide a function generator based on a single chip microcomputer and a frequency-voltage conversion chip, which is used for solving one or more technical problems in the prior art and at least provides a beneficial choice or creation condition.
The purpose of the invention is realized by adopting the following technical scheme: a function generator based on a single chip microcomputer and a frequency-voltage conversion chip comprises: the single chip microcomputer system circuit and the frequency-voltage conversion circuit; the singlechip system circuit is used for outputting a frequency pulse signal; the frequency-voltage conversion circuit is connected with the single chip microcomputer system circuit and outputs a corresponding voltage signal according to the frequency pulse signal.
As a further improvement of the above technical solution, the frequency-voltage conversion circuit further includes a capacitance multiplier filter circuit, and the capacitance multiplier filter circuit is connected to the frequency-voltage conversion circuit. For eliminating sawtooth ripples generated by the frequency-voltage conversion circuit.
As a further improvement of the technical scheme, the keyboard comprises a matrix keyboard circuit, wherein the matrix keyboard circuit is connected with the single chip microcomputer system circuit; the voltage waveform channel selection circuit is used for selecting a voltage waveform channel and adjusting voltage waveform parameters, and is high in adjustment range and accuracy.
As a further improvement of the technical scheme, the system further comprises a liquid crystal display screen, wherein the liquid crystal display screen is connected with the single chip microcomputer system circuit; the display device is used for displaying the output channel of the voltage waveform, the type of the output voltage waveform and the waveform parameters.
As a further improvement of the above technical solution, the single chip microcomputer system circuit includes a single chip microcomputer chip, a power supply circuit, a reset circuit, and a clock circuit, and the single chip microcomputer chip is connected to the power supply circuit, the reset circuit, and the clock circuit, respectively. And a power supply and a basic clock crystal oscillator are provided for the singlechip chip.
As a further improvement of the above technical solution, the frequency-voltage conversion circuit includes a frequency-voltage conversion chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first diode, and a second diode.
A first pin of the frequency-voltage conversion chip is connected with a power supply end, the upper end of the first resistor and the upper end of the third resistor; a second pin of the frequency-voltage conversion chip is respectively connected with the upper end of the second resistor, the upper end of the first capacitor, the lower end of the first resistor and the upper end of the first diode; a third pin of the frequency-voltage conversion chip is respectively connected with the lower end of the second resistor and the right end of the fourth resistor; a fourth pin of the frequency-voltage conversion chip is respectively connected with the upper end of the seventh resistor, the upper end of the second diode and the right end of the second capacitor; a fifth pin of the frequency-voltage conversion chip is connected with the upper end of the ninth resistor; the sixth pin of the frequency-voltage conversion chip is respectively connected with the seventh pin and the grounding terminal of the frequency-voltage conversion chip; the eighth pin of the frequency-voltage conversion chip is connected with the grounding end; a ninth pin of the frequency-voltage conversion chip is respectively connected with the lower end of the tenth resistor and the lower end of the fifth capacitor; a tenth pin of the frequency-voltage conversion chip is respectively connected with the lower end of the fourth capacitor, the upper end of the tenth resistor and the upper end of the fifth capacitor; and an eleventh pin of the frequency-voltage conversion chip is connected with the upper end of the fourth capacitor.
The lower end of the third resistor is connected with a grounding end, and the slip sheet end of the third resistor is connected with the left end of the fourth resistor; the lower end of the first diode and the lower end of the first capacitor are respectively connected with a grounding terminal; the left end of the second capacitor is connected with the right end of the fifth resistor, and the left end of the fifth resistor is connected with the frequency input signal end; the lower end of the second diode is respectively connected with the upper end of the third capacitor, the lower end of the seventh resistor, the upper end of the eighth resistor and the lower end of the sixth resistor, and the upper end of the sixth resistor is connected with a power supply end; the lower end of the third capacitor is connected with the lower end of the eighth resistor, the lower end of the ninth resistor and the ground terminal respectively.
As a further improvement of the above technical solution, the capacitance multiplier filter circuit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a sixth capacitor, a seventh capacitor, and an amplifier; the left end of the eleventh resistor is connected with the frequency-voltage conversion circuit, and the right end of the eleventh resistor is respectively connected with a voltage output end, the upper end of the sixth capacitor and the upper end of the seventh capacitor; the lower end of the sixth capacitor is respectively connected with the upper end of the thirteenth resistor, the left end of the twelfth resistor and the inverting input end of the amplifier; the right end of the twelfth resistor is connected with the lower end of the seventh capacitor and the output end of the amplifier respectively; the lower end of the thirteenth resistor is respectively connected with the non-inverting input end and the grounding end of the amplifier.
As a further improvement of the technical scheme, the frequency-voltage conversion chip is TC9400 and has high conversion efficiency.
As a further improvement of the technical scheme, the liquid crystal display screen is L CD9648, and the performance is good.
The invention has the beneficial effects that: the single chip microcomputer system circuit is used for outputting frequency pulse signals; the frequency-voltage conversion circuit is connected with the single chip microcomputer system circuit, corresponding voltage signals are output according to the frequency pulse signals, the single chip microcomputer system circuit only outputs pulses, and the output mode is single, so that stable output can be obtained; simple structure, low cost, and stable output signal.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic circuit module structure diagram of a function generator based on a single chip microcomputer and a frequency-voltage conversion chip, provided by the invention;
FIG. 2 is a frequency-voltage conversion circuit diagram of a function generator based on a single chip microcomputer and a frequency-voltage conversion chip, provided by the invention;
FIG. 3 is a filter circuit diagram of a capacitance multiplier of a frequency-voltage conversion circuit of a function generator based on a single chip microcomputer and a frequency-voltage conversion chip, which is provided by the invention;
FIG. 4 is a circuit diagram of a system and peripheral circuits of a single chip microcomputer based on a single chip microcomputer and a frequency-voltage conversion chip;
FIG. 5 is a diagram of the output pulse mode of the pin of the single chip microcomputer when the function generator outputs the sawtooth wave based on the single chip microcomputer and the frequency-voltage conversion chip provided by the invention;
the coordinate arrows in fig. 2, 3 and 4 represent up, down, left and right, respectively.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Embodiment 1, referring to fig. 1, a function generator based on a single chip microcomputer and a frequency-voltage conversion chip includes: the device comprises a frequency-voltage conversion circuit, a capacitor multiplier filter circuit, a matrix keyboard circuit, a singlechip system circuit and a liquid crystal display screen; the single chip microcomputer system circuit is respectively connected with and controls the frequency-voltage conversion circuit, the matrix keyboard circuit and the liquid crystal display screen, and the capacitance multiplier filter circuit is connected with the frequency-voltage conversion circuit.
The matrix keyboard is a keyboard group with the arrangement similar to a matrix used in single chip microcomputer peripheral equipment. The matrix keyboard circuit is used for selecting voltage waveform channels and adjusting voltage waveform parameters.
The singlechip system circuit is used for outputting pulse signals with different frequencies, detecting voltage waveform channels and waveform parameters of the matrix keyboard circuit and controlling the output size and frequency of the voltage waveform.
The liquid crystal display screen is connected with the single chip microcomputer system circuit and used for displaying the voltage waveform output channel and outputting the type and waveform parameters of the voltage waveform.
Referring to fig. 4, the single chip microcomputer system circuit comprises a single chip microcomputer chip U2, a power supply circuit, a reset circuit and a clock circuit, wherein the single chip microcomputer chip U2 is respectively connected with the power supply circuit, the reset circuit and the clock circuit, the clock circuit consists of two capacitors and a crystal oscillator and is used for providing basic clock crystal oscillation for the single chip microcomputer chip U2, a peripheral circuit of the single chip microcomputer chip U2 comprises the power supply circuit, a clock crystal oscillation pin, a reset pin, a keyboard scanning pin, a L CD9648 display screen pin, a serial port pin and three pulse waveform output pins, and the single chip microcomputer chip U2 adopts an STM series.
Specifically, referring to fig. 4, the single chip system circuit and the peripheral circuit include: the single-chip microcomputer chip U2, the liquid crystal display chip U3, the USB interface U4, the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the crystal oscillator Y1, the first switch SW1, the second switch SW2, the third switch SW3, the fourth switch SW4, the fifth switch SW5, the sixth switch SW6 and the seventh switch SW 7; a first pin of the singlechip chip U2 is respectively connected with the upper end of the eighth capacitor C8 and the upper end of the crystal oscillator Y1; a second pin of the singlechip chip U2 is respectively connected with the lower end of the crystal oscillator Y1 and the lower end of the ninth capacitor C9; the lower end of the eighth capacitor C8 is connected with the upper end of the ninth capacitor C9 and the ground end respectively; a third pin of the singlechip chip U2 is respectively connected with the lower end of a tenth capacitor C10, the lower end of a seventh switch SW7 and the left end of a fourteenth resistor R14; the upper end of the tenth capacitor C10 is connected to the upper end of the seventh switch SW 7; the right end of the fourteenth resistor R14 is connected with the ground terminal; a fourth pin GND of the singlechip chip U2 is connected with a fourth pin of the USB interface U4; a fifth pin D + of the singlechip chip U2 is connected with a third pin of the USB interface U4; the sixth pin D-of the singlechip chip U2 is connected with the second pin of the USB interface U4; the seventh pin VCC of the single chip U2 is connected to the first pin of the USB interface U4.
The eighth pin RESET of the single chip microcomputer chip U is connected with the eighth pin of the liquid crystal display chip U, the ninth pin CS of the single chip microcomputer chip U is connected with the seventh pin of the liquid crystal display chip U, the tenth pin RS of the single chip microcomputer chip U is connected with the sixth pin of the liquid crystal display chip U, the eleventh pin SDA of the single chip microcomputer chip U is connected with the fifth pin of the liquid crystal display chip U, the twelfth pin SC of the single chip microcomputer chip U is connected with the fourth pin of the liquid crystal display chip U, the thirteenth pin NC of the single chip microcomputer chip U is connected with the third pin of the liquid crystal display chip U, the fourteenth pin VCC of the single chip U is connected with the second pin of the liquid crystal display chip U, the fifteenth pin GND of the single chip microcomputer chip U is connected with the first pin of the liquid crystal display chip U, the sixteenth pin of the single chip microcomputer chip U is respectively connected with the right end of the fourth switch SW, the right end of the fifth switch SW and the right end of the sixth switch SW, the seventeenth pin GND of the seventeenth pin of the single chip U is respectively connected with the right end of the first switch SW, the right end of the second switch SW and the left end of the sixth switch SW, the eighteenth pin of the single chip SW is respectively connected with the left switch SW of the left switch SW, and the left switch SW of the ninth switch SW.
The frequency-voltage conversion circuit is used for converting the frequency pulse signal output by the singlechip system circuit into a voltage signal. The capacitor multiplier filter circuit is used for eliminating sawtooth ripples generated by the frequency-voltage conversion circuit.
Referring to fig. 5, the function generator outputs a sawtooth wave in a pulse mode output by a pin U2 of the chip. The function generator is used for converting a pulse with a certain frequency into a corresponding voltage output, when the output is a sawtooth wave, the voltage has the characteristic of linear increase along with time, so that the frequency of the pulse also increases along with time, and the function generator is specifically represented as follows: the duty cycle of the pulses decreases linearly with time during a certain complete period of the sawtooth wave.
Preferably, the frequency-to-voltage conversion circuit provides three outputs of the waveform using three frequency-to-voltage conversion chips U1. Preferably, the frequency-voltage conversion chip U1 is model TC 9400.
Referring to fig. 2 and 3, the frequency-voltage conversion circuit and the capacitor multiplier filter circuit include: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a first diode D1, a second diode D2 and an amplifier.
The first pin VDD of the frequency-voltage conversion chip U1 is connected with a power supply end, the upper end of a first resistor R1 and the upper end of a third resistor R3; the second pin GND of the frequency-voltage conversion chip U1 is connected to the upper end of the second resistor R2, the upper end of the first capacitor C1, the lower end of the first resistor R1, and the upper end of the first diode D1, respectively; a third pin ZeroAdjust of the frequency-voltage conversion chip U1 is respectively connected with the lower end of the second resistor R2 and the right end of the fourth resistor R4; a fourth pin DET of the frequency-voltage conversion chip U1 is connected to the upper end of the seventh resistor R7, the upper end of the second diode D2, and the right end of the second capacitor C2, respectively; the fifth pin IBIAS of the frequency-voltage conversion chip U1 is connected with the upper end of the ninth resistor R9; the sixth pin VREF of the frequency-voltage conversion chip U1 is connected to the seventh pin VSS of the frequency-voltage conversion chip U1 and the ground terminal, respectively; an eighth pin GND of the frequency-voltage conversion chip U1 is respectively connected with the lower end of the thirteenth resistor R13, the non-inverting input end of the amplifier and the ground end; a ninth pin OUT of the frequency-voltage conversion chip U1 is connected to the lower end of the tenth resistor R10, the lower end of the fifth capacitor C5, and the left end of the eleventh resistor R11, respectively; a tenth pin INN of the frequency-voltage conversion chip U1 is connected to the lower end of the fourth capacitor C4, the upper end of the tenth resistor R10, and the upper end of the fifth capacitor C5, respectively; an eleventh pin VREF OUT of the frequency-voltage conversion chip U1 is connected to the upper end of the fourth capacitor C4.
The lower end of the third resistor R3 is connected with the ground terminal, and the sliding vane end of the third resistor R3 is connected with the left end of the fourth resistor R4; the lower end of the first diode D1 and the lower end of the first capacitor C1 are respectively connected with the ground terminal; the left end of the second capacitor C2 is connected with the right end of the fifth resistor R5, and the left end of the fifth resistor R5 is connected with a frequency input signal end; the lower end of the second diode D2 is connected to the upper end of the third capacitor C3, the lower end of the seventh resistor R7, the upper end of the eighth resistor R8 and the lower end of the sixth resistor R6, respectively, and the upper end of the sixth resistor R6 is connected to a power supply terminal; the lower end of the third capacitor C3 is respectively connected with the lower end of the eighth resistor R8, the lower end of the ninth resistor R9 and the ground terminal; the upper end of the sixth capacitor C6 is connected with the upper end of the seventh capacitor C7 and the voltage signal output end respectively; the lower end of the sixth capacitor C6 is respectively connected with the upper end of the thirteenth resistor R13, the inverting input end of the amplifier and the left end of the twelfth resistor R12; the right end of the twelfth resistor R12 is connected to the lower end of the seventh capacitor C7 and the output end of the amplifier respectively.
The output of different waveforms is realized through a singlechip system circuit, a matrix keyboard circuit, a frequency-voltage conversion circuit and a liquid crystal display screen, and the output mode is single, so that stable output can be obtained; the directly regulated parameter is the pulse frequency, and the regulation range and the regulation precision are higher.
Specifically, a signal function is written into a programming program, the signal function is burnt into the single chip microcomputer chip U2 through a USB serial port, and an interrupt function of the serial port communication of the single chip microcomputer chip U2 is turned on in the program for debugging the program; because the pulse of the singlechip system is converted into a voltage signal through an external circuit, in a program, two-bit parameters are preset through a matrix keyboard when pulse output is defined for determining the speed of pulse change and the pulse frequency, so that the pulse size and the change rate can be converted into the voltage size and frequency when the pulse output is output; the program also comprises a key detection driving program and a display driving program, different channels are selected to output waveforms with different frequencies and amplitudes through level detection of pins connected with matrix keys, and the liquid crystal display screen is driven through the display driving program.
The matrix keyboard adjusts voltage waveform output channels and waveform parameters, and the selection of the waveform output channels meets the requirements of simultaneous output or single-channel output; because the whole single chip microcomputer system converts the pulse into the corresponding voltage value to be output, the adjustment of the waveform parameters is essentially to adjust the pulse frequency and the frequency change rate of the single chip microcomputer system, the pulse output by the single chip microcomputer system acts on the frequency-voltage conversion chip U1, the frequency-voltage conversion chip U1 converts the pulse with different frequencies into the corresponding linear voltage value under the frequency parameter, and the change rate of the pulse frequency determines the frequency of the output voltage.
The liquid crystal display screen displays the parameters of the waveform output channel, the frequency and the amplitude, and the parameters can be modified through a matrix keyboard; the voltage signal output by the frequency-voltage conversion chip U1 is subjected to filtering elimination by a capacitor multiplier filter circuit, and finally, a voltage signal is output. The output is stable, and the adjusting range and the adjusting precision are high.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (9)
1. The utility model provides a function generator based on singlechip and frequency-voltage conversion chip which characterized in that: the method comprises the following steps:
a singlechip system circuit for outputting a frequency pulse signal,
and the frequency-voltage conversion circuit is connected with the single chip microcomputer system circuit and outputs a corresponding voltage signal according to the frequency pulse signal.
2. The function generator based on the single chip microcomputer and the frequency-voltage conversion chip as claimed in claim 1, wherein: the frequency-voltage conversion circuit is characterized by also comprising a capacitance multiplier filter circuit, wherein the capacitance multiplier filter circuit is connected with the frequency-voltage conversion circuit.
3. The function generator based on the single chip microcomputer and the frequency-voltage conversion chip as claimed in claim 1, wherein: the keyboard comprises a single chip microcomputer system and is characterized by further comprising a matrix keyboard circuit, wherein the matrix keyboard circuit is connected with the single chip microcomputer system through a circuit.
4. The function generator based on the single chip microcomputer and the frequency-voltage conversion chip as claimed in claim 1, wherein: the liquid crystal display screen is connected with the single chip microcomputer system circuit.
5. The function generator based on the single chip microcomputer and the frequency-voltage conversion chip as claimed in claim 1, wherein: the single chip microcomputer system circuit comprises a single chip microcomputer chip, a power supply circuit, a reset circuit and a clock circuit, wherein the single chip microcomputer chip is respectively connected with the power supply circuit, the reset circuit and the clock circuit.
6. The function generator based on the single chip microcomputer and the frequency-voltage conversion chip as claimed in claim 1, wherein: the frequency-voltage conversion circuit comprises a frequency-voltage conversion chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first diode and a second diode; a first pin of the frequency-voltage conversion chip is connected with a power supply end, the upper end of the first resistor and the upper end of the third resistor; a second pin of the frequency-voltage conversion chip is respectively connected with the upper end of the second resistor, the upper end of the first capacitor, the lower end of the first resistor and the upper end of the first diode; a third pin of the frequency-voltage conversion chip is respectively connected with the lower end of the second resistor and the right end of the fourth resistor; a fourth pin of the frequency-voltage conversion chip is respectively connected with the upper end of the seventh resistor, the upper end of the second diode and the right end of the second capacitor; a fifth pin of the frequency-voltage conversion chip is connected with the upper end of the ninth resistor; the sixth pin of the frequency-voltage conversion chip is respectively connected with the seventh pin and the grounding terminal of the frequency-voltage conversion chip; the eighth pin of the frequency-voltage conversion chip is connected with the grounding end; a ninth pin of the frequency-voltage conversion chip is respectively connected with the lower end of the tenth resistor and the lower end of the fifth capacitor; a tenth pin of the frequency-voltage conversion chip is respectively connected with the lower end of the fourth capacitor, the upper end of the tenth resistor and the upper end of the fifth capacitor; an eleventh pin of the frequency-voltage conversion chip is connected with the upper end of the fourth capacitor;
the lower end of the third resistor is connected with a grounding end, and the slip sheet end of the third resistor is connected with the left end of the fourth resistor; the lower end of the first diode and the lower end of the first capacitor are respectively connected with a grounding terminal; the left end of the second capacitor is connected with the right end of the fifth resistor, and the left end of the fifth resistor is connected with the frequency input signal end; the lower end of the second diode is respectively connected with the upper end of the third capacitor, the lower end of the seventh resistor, the upper end of the eighth resistor and the lower end of the sixth resistor, and the upper end of the sixth resistor is connected with a power supply end; the lower end of the third capacitor is connected with the lower end of the eighth resistor, the lower end of the ninth resistor and the ground terminal respectively.
7. The function generator based on the single chip microcomputer and the frequency-voltage conversion chip as claimed in claim 2, wherein: the capacitance multiplier filter circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a sixth capacitor, a seventh capacitor and an amplifier; the left end of the eleventh resistor is connected with the frequency-voltage conversion circuit, and the right end of the eleventh resistor is respectively connected with a voltage output end, the upper end of the sixth capacitor and the upper end of the seventh capacitor; the lower end of the sixth capacitor is respectively connected with the upper end of the thirteenth resistor, the left end of the twelfth resistor and the inverting input end of the amplifier; the right end of the twelfth resistor is connected with the lower end of the seventh capacitor and the output end of the amplifier respectively; the lower end of the thirteenth resistor is respectively connected with the non-inverting input end and the grounding end of the amplifier.
8. The function generator based on the single chip microcomputer and the frequency-voltage conversion chip as claimed in claim 6, wherein: the model of the frequency-voltage conversion chip is TC 9400.
9. The function generator based on the single chip microcomputer and the frequency-voltage conversion chip as claimed in claim 4, wherein the liquid crystal display screen is L CD 9648.
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| CN202010218176.XA CN111399412A (en) | 2020-03-25 | 2020-03-25 | Function generator based on single chip microcomputer and frequency-voltage conversion chip |
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| CN202010218176.XA CN111399412A (en) | 2020-03-25 | 2020-03-25 | Function generator based on single chip microcomputer and frequency-voltage conversion chip |
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| CN104509208A (en) * | 2012-06-26 | 2015-04-08 | 安蒂奥基亚专上学院 | Multiplexing ultra-low power LED illuminator |
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Application publication date: 20200710 |