CN109004919B - Current/frequency conversion circuit and conversion method based on triangular wave modulation - Google Patents
Current/frequency conversion circuit and conversion method based on triangular wave modulation Download PDFInfo
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- CN109004919B CN109004919B CN201811161912.1A CN201811161912A CN109004919B CN 109004919 B CN109004919 B CN 109004919B CN 201811161912 A CN201811161912 A CN 201811161912A CN 109004919 B CN109004919 B CN 109004919B
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000007493 shaping process Methods 0.000 claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims description 27
- 230000005669 field effect Effects 0.000 claims description 14
- 239000013078 crystal Substances 0.000 claims description 12
- 230000010354 integration Effects 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 12
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
- H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
- H03K4/50—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor
- H03K4/501—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g. by a comparator
- H03K4/502—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g. by a comparator the capacitor being charged from a constant-current source
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to a high-precision current/frequency conversion circuit and a conversion method based on triangular wave modulation, wherein the high-precision current/frequency conversion circuit comprises a main integrator, the input end of the main integrator is an input current end, the output ends of the main integrator and a triangular wave generation circuit are connected with the input end of a comparator, the output end of the comparator is connected with one input end of a digital processing circuit, the two output ends of the digital processing circuit are respectively connected with the control end of an ultra-high-speed switching circuit and the input end of an output circuit, the input end of the ultra-high-speed switching circuit is connected with the output end of a constant current source circuit, the output end of the ultra-high-speed switching circuit is connected with the input end of the main integrator, the output end of a shaping circuit is connected with the other input end of the digital processing circuit, and the input end of the shaping circuit is connected with the output end of the triangular wave generation circuit. The invention solves the problems of high debugging difficulty, high requirements for debugging personnel and incapability of meeting the requirement of mass production in the current production and debugging process.
Description
Technical Field
The invention belongs to the technical field of analog-digital hybrid circuits, and particularly relates to a current/frequency conversion circuit and a conversion method based on triangular wave modulation.
Background
The current/frequency conversion circuit is one of the important components of inertial navigation systems, used with accelerometers in inertial navigation systems, to convert the output current of the accelerometer into a digital pulse signal proportional thereto. At present, a current/frequency conversion circuit adopting a charge balance principle is widely applied, a threshold level compared with a main integrator in a traditional method adopts a fixed threshold level, the switching times of a constant current source are larger when a current signal is input greatly, and the precision is difficult to achieve an ideal target because the transition time is a main factor influencing the conversion precision in the switching process of the constant current source, and the compensation is usually carried out by adopting a compensation or digital calibration method, but the process is complex, the debugging workload is large, and the requirement on elements is higher. Therefore, the traditional circuit structure is necessary to be improved, errors caused by the transition process are reduced mechanically, the circuit precision is improved, and the debugging difficulty is reduced.
Disclosure of Invention
The invention mainly aims to provide a current/frequency conversion circuit and a conversion method based on triangular wave modulation, which aim to reduce the overall switching working frequency of the circuit, reduce errors caused by a transitional process in mechanism, improve the circuit precision and reduce the debugging difficulty.
In order to achieve the above objective, the present invention provides a current/frequency conversion circuit based on triangular wave modulation, which comprises a main integrator, a comparator, a digital processing circuit, a shaping circuit, a super-high speed switch circuit, a constant current source circuit, an output circuit and a triangular wave generation circuit, wherein the input end of the main integrator is an input current end, the output ends of the main integrator and the triangular wave generation circuit are connected with the input end of the comparator, the output end of the comparator is connected with one input end of the digital processing circuit, the two output ends of the digital processing circuit are respectively connected with the control end of the super-high speed switch circuit and the input end of the output circuit, the input end of the super-high speed switch circuit is connected with the output end of the constant current source circuit, the output end of the shaping circuit is connected with the other input end of the digital processing circuit, and the input end of the shaping circuit is connected with the output end of the triangular wave generation circuit; the triangular wave generating circuit comprises a frequency dividing circuit, a threshold integral amplifying circuit and a crystal oscillator, wherein the input end of the frequency dividing circuit is connected with the input end of the shaping circuit through the crystal oscillator, the output end of the frequency dividing circuit is connected with the output end of the threshold integral amplifying circuit, and the output end of the threshold integral amplifying circuit is connected with the input end of the comparator.
In an embodiment of the present application, the triangular wave generating circuit includes a frequency dividing circuit, a threshold integral amplifying circuit and a crystal oscillator, an input end of the frequency dividing circuit is connected with an input end of the shaping circuit through the crystal oscillator, an output end of the frequency dividing circuit is connected with an output end of the threshold integral amplifying circuit, and an output end of the threshold integral amplifying circuit is connected with an input end of the comparator.
In an embodiment of the present application, the main integrator includes a precision operational amplifier N1, an integrating capacitor Cf1, a triode VJ1 and a triode VJ2, where a non-inverting input end of the precision operational amplifier N1 is grounded, an inverting input end of the precision operational amplifier N1 is used as an input current end through a resistor RJ1, an output end of the precision operational amplifier N1 is sequentially connected with an input end of a comparator through resistors RJ2 and RJ3, bases of the triode VJ1 and the triode VJ2 are connected at a node between the resistor RJ2 and the resistor RJ3, a collector of the triode VJ1 is connected with a positive electrode of a power supply, a collector of the triode VJ2 is connected with a negative electrode of the power supply, emitters of the triode VJ1 and the triode VJ2 are respectively connected with an input end of the comparator and one end of the integrating capacitor Cf1 through resistors RJ4 and RJ5, and the other end of the integrating capacitor Cf1 is connected with the inverting input end of the precision operational amplifier N1; the triode VJ1 is an N-type triode, and the triode VJ2 is a P-type triode.
In an embodiment of the present application, the threshold integrating amplifying circuit includes an integrator N2 and a proportional operational amplifier N3, where an in-phase input end of the integrator N2 is grounded, an inverting input end of the integrator N2 is connected to an output end of the frequency dividing circuit through a resistor RT1, an output end of the integrator N2 is connected to an inverting input end of the proportional operational amplifier N3 through a resistor RT2, an in-phase input end of the proportional operational amplifier N3 is grounded, and an output end of the proportional operational amplifier N3 is connected to the comparator.
In an embodiment of the present application, the ultra-high speed switching circuit is composed of transistors V1 and V2, a field effect transistor V3, and a peripheral circuit, wherein a base electrode of the transistor V1 is connected in parallel with a resistor R1 and a capacitor C1 and then is connected with an output end of the digital processing circuit, an emitter electrode of the transistor V1 is connected with a power supply, and a collector electrode of the transistor V1 is connected with a gate electrode of the field effect transistor V3 through the resistor R2; the collector of the triode V2 is connected with the grid of the field effect transistor V3, the emitter of the triode V is connected with a power supply, the base of the triode is connected at a node between the capacitor C1 and the resistor R1 through the capacitor C3, and the source and the grid of the field effect transistor V3 are output ends of the ultra-high-speed switch circuit; one end of a capacitor C2 is connected between the resistor R2 and the collector electrode of the triode V1, and the other end of the capacitor C2 is connected to the gate electrode of the field effect transistor V3; wherein, triode V1 is P type triode, triode V2 is N type triode.
The application also discloses a conversion method of the current/frequency conversion circuit based on triangular wave modulation, which is used for the current/frequency conversion circuit based on triangular wave modulation, and comprises the following steps:
(1) The constant current source circuit and the input current are continuously integrated and reset through the main integrator to generate periodic sawtooth wave integrated voltage;
(2) The integrated voltage is compared with threshold level through a comparator and then digitized to form high and low pulse waveforms;
(3) The digital processing circuit is used for shaping the digitized pulse wave according to the output frequency of the shaping circuit, so that the pulse width and the frequency of the pulse wave are synchronized to the integral multiple of the output frequency of the shaping circuit, and meanwhile, the pulse output by the digital processing circuit is used for controlling the on-off of the ultra-high speed switch circuit, so that the disconnection and the connection of the constant current source circuit are realized, and the integration and the reset time of the main integrator are controlled.
According to the technical scheme, the high-precision current/frequency conversion circuit based on triangular wave modulation reduces the overall switching frequency of the circuit, adopts an ultra-high-speed switch composed of discrete devices, reduces errors caused by a transitional process in a mechanism, and improves the circuit precision. The current/frequency conversion circuit provided by the invention can achieve higher precision without compensation, and solves the problems of high debugging difficulty, higher requirements on debugging personnel and incapability of meeting the requirement of mass production in the current production debugging process.
Drawings
The invention will now be described in detail with reference to specific embodiments and accompanying drawings, in which:
FIG. 1 is a schematic block diagram of the circuit of the present invention;
FIG. 2 is a circuit diagram of a main integrator of the present invention;
FIG. 3 is a circuit diagram of a threshold integral amplifying circuit of the present invention;
FIG. 4 is a circuit diagram of an ultra-high switching circuit of the present invention;
fig. 5 is a waveform diagram of the circuit operation signals of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the high-precision current/frequency conversion circuit based on triangular wave modulation in this embodiment includes a main integrator 1, a comparator 5, a digital processing circuit 7, a shaping circuit 6, a super-high speed switching circuit 8, a constant current source circuit 9, an output circuit 10 and a triangular wave generation circuit, wherein the input end of the main integrator 1 is an input current end, the output ends of the main integrator 1 and the triangular wave generation circuit are connected with the input end of the comparator 5, the output end of the comparator 5 is connected with one input end of the digital processing circuit 7, the two output ends of the digital processing circuit 7 are respectively connected with the control end of the super-high speed switching circuit 8 and the input end of the output circuit 10, the input end of the super-high speed switching circuit 8 is connected with the output end of the constant current source circuit 9, the output end of the super-high speed switching circuit 8 is connected with the input end of the main integrator 1, the output end of the shaping circuit 6 is connected with the other input end of the digital processing circuit 7, and the input end of the shaping circuit 6 is connected with the output end of the triangular wave generation circuit.
The output of the main integrator 1 is connected with one input of the comparator 5, and is compared with the other threshold level of the comparator 5, the other threshold level is a low-frequency triangular wave, the low-frequency triangular wave is generated by the threshold integral amplifying circuit 4, and the input of the threshold integral amplifying circuit 4 is a 16KHz low-frequency square wave signal which is obtained by the crystal oscillator through the frequency dividing circuit 3. One path of output of the digital processing circuit 7 is connected with the constant current source circuit 9 to the input end of the main integrator 1 by controlling the ultra-high speed switching circuit 8, the on-off of the ultra-high speed switching circuit 8 is controlled according to the output condition of the digital processing circuit 7, the 128KHz frequency standard signal generated by the crystal oscillator 2 is shaped by the shaping circuit and then is input to the digital processing circuit 7, and the output circuit 10 is controlled to generate pulse output.
The triangular wave generating circuit comprises a frequency dividing circuit 3, a threshold integral amplifying circuit 4 and a crystal oscillator 2, wherein the input end of the frequency dividing circuit 3 is connected with the input end of a shaping circuit 6 through the crystal oscillator 2, the output end of the frequency dividing circuit 3 is connected with the output end of the threshold integral amplifying circuit 4, and the output end of the threshold integral amplifying circuit 4 is connected with the input end of a comparator 5.
As shown in fig. 2, the main integrator 1 includes a precision operational amplifier N1, an integrating capacitor Cf1, a triode VJ1 and a triode VJ2, the in-phase input end of the precision operational amplifier N1 is grounded, the inverting input end of the precision operational amplifier is used as an input current end through a resistor RJ1, the output end of the precision operational amplifier N1 is connected with the input end of a comparator 5 through resistors RJ2 and RJ3 in sequence, the bases of the triode VJ1 and the triode VJ2 are connected at a node between the resistor RJ2 and the resistor RJ3, the collectors of the triode VJ1 and the triode VJ2 are connected with a power supply, the emitters of the triode VJ1 and the triode VJ2 are connected with the input end of the comparator 5 and one end of the integrating capacitor Cf1 through resistors RJ4 and RJ5 respectively, and the other end of the integrating capacitor Cf1 is connected with the inverting input end of the precision operational amplifier N1.
As shown in fig. 3, the threshold integrating amplifier circuit 4 is composed of an integrating circuit composed of a front-stage integrator N2 and a proportional operational amplifier circuit composed of a rear-stage proportional operational amplifier N3, the non-inverting input terminal of the integrator N2 is grounded, the inverting input terminal of the integrator N2 is connected with the 3 output terminal of the frequency dividing circuit via a resistor RT1, the output terminal of the integrator N2 is connected with the inverting input terminal of the proportional operational amplifier N3 via a resistor RT2, the non-inverting input terminal of the proportional operational amplifier N3 is grounded, and the output terminal of the proportional operational amplifier N3 is connected with the comparator.
The integrating circuit formed by the front-stage integrator N2 is a low-frequency square wave obtained by crystal oscillator frequency division, the frequency is 16KHz, the capacitance value of the integrating capacitor CT1 in the integrating circuit formed by N2 is 0.033uf, and the values of the nodes RT2 and RT3 can be flexibly adjusted according to the requirement to finely adjust the horizontal potential of the output threshold triangular wave so as to finely adjust the actual measurement linearity of the circuit, so that the circuit achieves the expected working precision.
As shown in fig. 4, the ultra-high-speed switch circuit 8 is composed of transistors V1 and V2, a field effect transistor V3 and a peripheral circuit, wherein the base electrode of the transistor V1 is connected in parallel with the output end of the digital processing circuit 7 through a resistor R1 and a capacitor C1, the collector electrode of the transistor V1 is connected with a power supply, and the emitter electrode of the transistor V1 is connected with the gate electrode of the field effect transistor V3 through a resistor R2; the collector of the triode V2 is connected with the grid of the field effect transistor V3, the emitter of the triode V2 is connected with a power supply, the base of the triode V2 is connected at the node between the capacitor C1 and the resistor R1 through the capacitor C3, and the source and the grid of the field effect transistor V3 are the output ends of the ultra-high-speed switch circuit 8.
When the input is high, the triode V1 is cut off, and when the G-stage voltage of the JFET V3 is-15V, the switch is opened. When the input is low. The triode V1 is conducted, and the G-level voltage of the JFET V3 can be about-2V through reasonably distributing the resistance values of R2 and R3, so that the switch is conducted. The charge and discharge path of the turn-on process is composed of the transistor V1 and the capacitor C2, and the charge and discharge path of the turn-off process is composed of the transistor V2. Normally the transistor will be turned on for a smaller time than it is turned off, and this feature can be exploited by the fact that when the input is high, transistor V2 is turned on and then transistor V1 is turned off, which will bring the voltage of stage G of JFET V3 to-15V, because even when transistor V1 is not yet fully turned off, transistor V2 turns on which will immediately charge stage G of JFET to-15V. The base capacitor C3 of transistor V2 will be excited to keep transistor on until V1 is completely turned off. Similarly, when the input is low, the base capacitor C1 of the transistor V1 will generate excitation to turn on the transistor V1, and the capacitor C2 will charge the JFET immediately to turn on the JFET. By optimizing the parameters of each element, the switching speed of the ultra-high speed switching circuit can be less than 5ns
Working principle: the input current is connected to the input end of the main integrator 5, the constant current source circuit 9 is also connected to the input end of the main integrator 1 circuit through the ultra-high speed switch circuit 8, thus the two paths of currents can continuously integrate and reset the main integrator 1 circuit to generate periodic sawtooth wave integrated voltage, the integrated voltage is connected to the comparator 5 and the threshold level for comparison, then the integrated voltage is digitalized to form high and low pulse waveforms, the comparator 5 output is connected to the input of the digital processing circuit 7, the digital processing circuit 7 shapes the digitalized pulse waves according to the frequency output by the shaping circuit, the pulse width and the frequency of the pulse waves are synchronized to the integral multiple of the frequency output by the shaping circuit 6, the pulse output by the digital processing circuit 7 controls the on-off of the ultra-high speed switch circuit 8, the disconnection and the connection of the constant current source circuit are realized, the integral and the reset time of the main integrator 1 are controlled, the integral ratio of the sawtooth wave is in proportion to the input current according to the charge balance principle, the standardized pulse duty ratio is output by the digital processing circuit 7, and the output of the digital processing circuit 7 is in proportion to the ratio of the integral and the reset time of the sawtooth wave, and the output of the digital processing circuit is in proportion to the pulse ratio of the digital pulse output to the digital pulse ratio.
As shown in fig. 5, which shows the working waveform of the circuit, when the input current Iin is smaller, the waveform of the main integrator 1 works at the upper end of the threshold triangular wave, the integrating and resetting process is completed in one period of the triangular wave, and at this time, the reset pulse is smaller, and the corresponding output pulse is smaller. When the input current Iin is larger, the waveform of the main integrator 1 works at the lower end of the threshold triangular wave, and the integration and reset processes are completed in one period of the triangular wave, so that the reset pulse is larger, and the corresponding output pulse is more. It can be seen that with the introduction of the low frequency triangle waveform, the circuit integral reset always works at a lower switching frequency when large current and small current are input, and the working frequency is the frequency of the threshold triangle wave level of 16KHz, so that the error generated by the switching transition process is greatly reduced, and the high frequency error of the integrator is reduced. The output circuit can obtain the number of output pulses which are directly proportional to the width of the reset pulse by phase-separating the 128KHz frequency standard signal generated by the crystal oscillator 2 from the reset pulse, thereby realizing high-precision conversion from current to frequency.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (4)
1. A current/frequency conversion circuit based on triangular wave modulation, characterized in that: the device comprises a main integrator, a comparator, a digital processing circuit, a shaping circuit, an ultra-high-speed switch circuit, a constant current source circuit, an output circuit and a triangular wave generation circuit, wherein the input end of the main integrator is an input current end, the output ends of the main integrator and the triangular wave generation circuit are connected with the input end of the comparator, the output end of the comparator is connected with one input end of the digital processing circuit, the two output ends of the digital processing circuit are respectively connected with the control end of the ultra-high-speed switch circuit and the input end of the output circuit, the input end of the ultra-high-speed switch circuit is connected with the output end of the constant current source circuit, the output end of the ultra-high-speed switch circuit is connected with the input end of the main integrator, the output end of the shaping circuit is connected with the other input end of the digital processing circuit, the input end of the shaping circuit is connected with the output end of the triangular wave generation circuit, the triangular wave generation circuit comprises a frequency dividing circuit, a threshold integrating amplifying circuit and a crystal oscillator, the input end of the frequency dividing circuit is connected with the input end of the shaping circuit through the crystal oscillator, the output end of the frequency dividing circuit is connected with the input end of the threshold integrating amplifying circuit, and the input end of the threshold integrating amplifying circuit are connected with the input end of the comparator; the main integrator comprises a precise operational amplifier N1, an integrating capacitor Cf1, a triode VJ1 and a triode VJ2, wherein the non-inverting input end of the precise operational amplifier N1 is grounded, the inverting input end of the precise operational amplifier N1 is used as an input current end through a resistor RJ1, the output end of the precise operational amplifier N1 is sequentially connected with the input end of a comparator through resistors RJ2 and RJ3, the base electrodes of the triode VJ1 and the triode VJ2 are connected at a node between the resistor RJ2 and the resistor RJ3, the collector electrode of the triode VJ1 is connected with the positive electrode of a power supply, the collector electrodes of the triode VJ2 are connected with the negative electrode of the power supply, the emitting electrodes of the triode VJ1 and the triode VJ2 are respectively connected with the input end of the comparator and one end of the integrating capacitor Cf1 through resistors RJ4 and RJ5, and the other end of the integrating capacitor Cf1 is connected with the inverting input end of the precise operational amplifier N1; the triode VJ1 is an N-type triode, and the triode VJ2 is a P-type triode.
2. The triangle wave modulation-based current/frequency conversion circuit according to claim 1, wherein: the threshold integral amplifying circuit comprises an integrator N2 and a proportional operational amplifier N3, wherein the non-inverting input end of the integrator N2 is grounded, the inverting input end of the integrator N2 is connected with the output end of the frequency dividing circuit through a resistor RT1, the output end of the integrator N2 is connected with the inverting input end of the proportional operational amplifier N3 through a resistor RT2, the non-inverting input end of the proportional operational amplifier N3 is grounded, and the output end of the proportional operational amplifier N3 is connected with the comparator.
3. The triangle wave modulation-based current/frequency conversion circuit according to claim 1, wherein: the ultra-high speed switching circuit consists of triodes V1 and V2, a field effect transistor V3 and a peripheral circuit, wherein the base electrode of the triode V1 is connected with the output end of the digital processing circuit after being connected in parallel through a resistor R1 and a capacitor C1, the emitter electrode of the triode V1 is connected with a power supply, and the collector electrode of the triode V1 is connected with the grid electrode of the field effect transistor V3 through the resistor R2; the collector of the triode V2 is connected with the grid of the field effect transistor V3, the emitter of the triode V is connected with a power supply, the base of the triode is connected at a node between the capacitor C1 and the resistor R1 through the capacitor C3, and the source and the grid of the field effect transistor V3 are output ends of the ultra-high-speed switch circuit; one end of a capacitor C2 is connected between the resistor R2 and the collector electrode of the triode V1, and the other end of the capacitor C2 is connected to the gate electrode of the field effect transistor V3; wherein, triode V1 is P type triode, triode V2 is N type triode.
4. A conversion method of a triangular wave modulation-based current/frequency conversion circuit, characterized in that it is used for the triangular wave modulation-based current/frequency conversion circuit as claimed in any one of claims 1 to 3, comprising the steps of:
(1) The constant current source circuit and the input current are continuously integrated and reset through the main integrator to generate periodic sawtooth wave integrated voltage;
(2) The integrated voltage is compared with threshold level through a comparator and then digitized to form high and low pulse waveforms;
(3) The digital processing circuit is used for shaping the digitized pulse wave according to the output frequency of the shaping circuit, so that the pulse width and the frequency of the pulse wave are synchronized to the integral multiple of the output frequency of the shaping circuit, and meanwhile, the pulse output by the digital processing circuit is used for controlling the on-off of the ultra-high speed switch circuit, so that the disconnection and the connection of the constant current source circuit are realized, and the integration and the reset time of the main integrator are controlled.
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| CN201811161912.1A CN109004919B (en) | 2018-09-30 | 2018-09-30 | Current/frequency conversion circuit and conversion method based on triangular wave modulation |
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| CN201811161912.1A CN109004919B (en) | 2018-09-30 | 2018-09-30 | Current/frequency conversion circuit and conversion method based on triangular wave modulation |
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| CN109885121B (en) * | 2019-03-22 | 2020-05-19 | 西安微电子技术研究所 | Current/frequency conversion circuit |
| CN112128055B (en) * | 2019-09-27 | 2022-09-20 | 青岛航天半导体研究所有限公司 | Power generation control method based on gyroscope automatic navigation system |
| CN110868215B (en) * | 2019-12-10 | 2024-02-09 | 中国电子科技集团公司第四十三研究所 | Self-adaptive control high-precision current/frequency conversion circuit |
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