A laser gyro and its conversion amplifier circuit and preamplifier circuit

Abstract

The utility model discloses a laser gyroscope and conversion amplification circuit and preamplifier circuit, and conversion amplification circuit includes first alternating current processing circuit, second alternating current processing circuit, direct current processing circuit and first peripheral circuit, and two way alternating current processing circuit all includes alternating current transimpedance amplifier circuit, high pass filter circuit and reverse proportional operation circuit, and direct current processing circuit includes direct current transimpedance amplifier circuit, and first peripheral circuit includes resistance R4, resistance R12, resistance R9, resistance R28, resistance R29, resistance R7, electric capacity C3, electric capacity C5, resistance R23, resistance R15, resistance R11, electric capacity C4. The utility model discloses can support alternating current photoelectric signal, direct current photoelectric signal separation input and alternating current photoelectric signal mixed input, and only needs to switch the resistance and capacitance device on preamplifier circuit to realize.

Description

Technical Field

[0001] This utility model relates to the field of inertial navigation technology, specifically to a laser gyroscope and its conversion amplifier circuit and preamplifier circuit. Background Technology

[0002] The preamplifier circuit is a key module in the signal processing chain of a laser gyroscope, a high-precision inertial navigation device widely used in aerospace, military, and industrial fields. Its core principle is to measure angular velocity by detecting the phase difference between two counter-propagating laser beams in a rotating system. In this process, the preamplifier circuit's main function is to process the signals from the laser gyroscope, and its design directly affects the gyroscope's accuracy, sensitivity, and anti-interference capability.

[0003] Existing technical solutions use preamplifier circuits composed of operational amplifiers and comparators. There are multiple photoelectric signal detection methods for laser gyroscopes, and the preamplifier circuits need to adapt to multiple power supply methods. Existing technical solutions cannot support multiple photoelectric detection methods and have a single power supply method, resulting in poor adaptability. Utility Model Content

[0004] To address the problems in the background technology, this utility model proposes a laser gyroscope that can support separate input of AC photoelectric signals, DC photoelectric signals, and mixed input of AC and DC photoelectric signals, as well as its conversion amplifier circuit and preamplifier circuit.

[0005] The present invention adopts the following technical solution: A laser gyroscope conversion and amplification circuit includes a first AC processing circuit, a second AC processing circuit, a DC processing circuit, and a first peripheral circuit. The first AC processing circuit includes a first AC transimpedance amplifier circuit, a first high-pass filter circuit, and a first inverting proportional operational circuit. The first AC transimpedance amplifier circuit includes operational amplifier M1, and the first inverting proportional operational circuit includes operational amplifier M4. The second AC processing circuit includes a second AC transimpedance amplifier circuit, a second high-pass filter circuit, and a second inverting proportional operational circuit. The second AC transimpedance amplifier circuit includes operational amplifier M2, and the second inverting proportional operational circuit includes operational amplifier M3. The DC processing circuit includes operational amplifier M5. The first peripheral circuit includes resistors R4, R12, R9, R28, R29, and R17, and capacitors C3, C5, R23, R15, R11, and C4. The first signal input is connected to one end of resistor R12 and capacitor C3. The other end of capacitor C3 is connected to the inverting input of operational amplifier M1. The other end of resistor R12 is connected to one end of resistors R4, R9, R28, and R17. The other end of resistor R4 is connected to GND. The other end of resistor R9 is connected to the inverting input of operational amplifier M5. The other end of resistor R28 is connected to one end of resistor R29 and the non-inverting input of operational amplifier M5. The other end of resistor R17 is connected to the second signal input and one end of capacitor C5. The other end of resistor R29 is connected to GND. The other end of capacitor C5 is connected to the inverting input of operational amplifier M2. The non-inverting input terminals of operational amplifiers M1, M4, M2, and M3 are all connected to the reference voltage. The output of operational amplifier M1 is connected to the inverting input of operational amplifier M4 through a first high-pass filter circuit. The output of operational amplifier M4 forms the output of the first AC processing circuit. The output of operational amplifier M2 is connected to the inverting input of operational amplifier M3 through a second high-pass filter circuit. The output of operational amplifier M3 forms the output of the second AC processing circuit. One end of resistor R11 is connected to GND, and the other end of resistor R11 is connected to the inverting input terminal of the DC transimpedance amplifier circuit and one end of resistor R23. The other end of resistor R23 is connected to the output terminal of operational amplifier M5 and one end of resistor R15. The other end of resistor R15 is connected to one end of capacitor C4 to form the output terminal of the DC processing circuit. The other end of capacitor C4 is connected to GND.

[0006] Optionally, the first AC transimpedance amplifier circuit also includes a resistor R3, one end of which is connected to the inverting input terminal of the operational amplifier M1, and the other end of which is connected to the output terminal of the operational amplifier M1. The second AC transimpedance amplifier circuit also includes a resistor R25. One end of the resistor R25 is connected to the inverting input terminal of the operational amplifier M2, and the other end of the resistor R25 is connected to the output terminal of the operational amplifier M2. The DC processing circuit also includes a resistor R10, one end of which is connected to the inverting input terminal of the operational amplifier M5, and the other end of which is connected to the output terminal of the operational amplifier M5. The first inverting proportional operational circuit also includes a resistor R2 and a capacitor C2 connected in parallel. One connection terminal of the resistor R2 and capacitor C2 is connected to the inverting input terminal of the operational amplifier M4, and the other connection terminal of the resistor R2 and capacitor C2 is connected to the output terminal of the operational amplifier M4. The second inverting proportional operational circuit also includes a resistor R26 and a capacitor C7, which are connected in parallel. One connection terminal of the resistor R26 and capacitor C7 is connected to the inverting input terminal of the operational amplifier M3, and the other connection terminal of the resistor R26 and capacitor C7 is connected to the output terminal of the operational amplifier M3.

[0007] Optionally, the first high-pass filter circuit includes a capacitor C1 and a resistor R1. One end of the capacitor C1 is connected to the output terminal of the operational amplifier M1, and the other end of the capacitor C1 is connected to one end of the resistor R1. The other end of the resistor R1 is connected to the inverting input terminal of the operational amplifier M4. The second high-pass filter circuit includes capacitor C6 and resistor R27. One end of capacitor C6 is connected to the output terminal of operational amplifier M2, and the other end of capacitor C6 is connected to one end of resistor R27. The other end of resistor R27 is connected to the inverting input terminal of operational amplifier M3.

[0008] Optionally, it also includes a first package structure, in which a first AC transimpedance amplifier circuit, a second AC transimpedance amplifier circuit, a DC processing circuit, an operational amplifier M4, a resistor R2, an operational amplifier M3, a resistor R26, and a reference voltage are packaged in the first package structure using SIP technology.

[0009] Optionally, the first package structure includes a VCC pin and a VEE pin, and the positive power supply terminals of operational amplifiers M1, M2, M3, M4, and M5 are connected to the VCC pin. The negative power supply terminals of operational amplifiers M1, M2, M3, M4, and M5 are connected to the VEE pin.

[0010] As a general inventive concept, this utility model also provides a laser gyroscope preamplifier circuit, including a comparator circuit and the aforementioned conversion amplifier circuit. The comparator circuit includes a first comparator circuit, a second comparator circuit, and a second peripheral circuit. The first comparator circuit includes a comparator M6 and a resistor R5. One end of the resistor R5 is connected to the inverting input of the comparator M6, and the other end of the resistor R5 is connected to the output of the comparator M6. The second comparator circuit includes comparator M7 and resistor R22. One end of resistor R22 is connected to the inverting input of comparator M7, and the other end of resistor R22 is connected to the output of comparator M7. The second peripheral circuit includes resistors R6, R7, R14, R16, R21, R20, R8, R19, R13, R18, capacitors C8 and C9. The output of the first AC processing circuit is connected to one end of resistor R6. The other end of resistor R6 is connected to one end of resistor R14 and the non-inverting input of comparator M6. The other end of resistor R14 is connected to the power supply and one end of resistor R16. The other end of resistor R16 is connected to one end of resistor R21 and the non-inverting input of comparator M7. The output of the second AC processing circuit is connected to the other end of resistor R21. One end of resistor R7 is connected to the inverting input of comparator M6. The other end of resistor R7 is connected to the reference voltage and one end of resistor R20. The other end of resistor R20 is connected to the inverting input of comparator M7. One end of resistor R8 is connected to the output of comparator M6. The other end of resistor R8 is connected to one end of resistor R13 and one end of capacitor C8. The other end of resistor R13 is connected to GND and one end of resistor R18, the other end of capacitor C8 is connected to GND and one end of capacitor C9, the other end of resistor R18 is connected to one end of resistor R19 and the other end of capacitor C9, one end of resistor R19 is connected to the output of comparator M7, the connection of resistor R8, resistor R13 and capacitor C8 forms the output of the first comparator circuit, and the connection of resistor R19, resistor R18 and capacitor C9 forms the output of the second comparator circuit.

[0011] Optionally, the comparator circuit further includes a second package structure, in which the first comparator circuit and the second comparator circuit are packaged using SIP technology.

[0012] Optionally, the second package structure has a VSS pin and a VDD pin. The positive power supply terminals of comparators M6 and M7 are connected to the VDD pin, the negative power supply terminals of comparators M6 and M7 are connected to the VSS pin, the VSS pin is connected to GND, and the VDD pin is connected to the power supply through resistor R24.

[0013] Optionally, the second package structure has a first reference voltage pin connected to a reference voltage, and the second package structure has a second reference voltage pin. The first reference voltage pin and the second reference voltage pin are connected, and resistors R7 and R20 are connected to the second reference voltage pin.

[0014] As a general inventive concept, this utility model also provides a laser gyroscope, including the aforementioned laser gyroscope preamplifier circuit.

[0015] Compared with the prior art, the advantages of this utility model are: This invention is the first to be designed for multiple application scenarios, supporting separate input of AC photoelectric signals, DC photoelectric signals, and mixed input of AC and DC photoelectric signals, and is compatible with both single +5V and ±5V power supplies. Furthermore, for these application scenarios, only the resistors and capacitors in the preamplifier circuit need to be switched, making it well-suited for various usage scenarios. Attached Figure Description

[0016] To facilitate understanding of this invention, it will be described in more detail with reference to the specific embodiments shown in the accompanying drawings. These drawings depict only typical embodiments of this invention and should not be considered as limiting the scope of protection of this invention.

[0017] Figure 1 This is a circuit structure diagram of the conversion amplifier circuit according to an embodiment of the present invention.

[0018] Figure 2 This is a circuit structure diagram of the comparator circuit according to an embodiment of the present invention. Detailed Implementation

[0019] The embodiments of the present invention are described below with reference to the accompanying drawings, so that those skilled in the art can better understand and implement the present invention. However, the listed embodiments are not intended to limit the present invention. In the absence of conflict, the following embodiments and the technical features in the embodiments can be combined with each other, wherein the same components are indicated by the same reference numerals.

[0020] The purpose of this solution is to design a preamplifier circuit for laser gyroscope signal processing that is more compatible, adaptable, and smaller in size than existing solutions.

[0021] The schematic diagram of this solution is as follows: Figure 1 As shown, Figure 1 The area within the dashed lines represents the IV conversion circuit and the amplifier circuit. Figure 2 The area within the dashed line represents the comparator circuit; the others are external adjustment circuits. Hunan 208 Advanced Technology Co., Ltd. utilizes the latest SIP technology to integrate the IV conversion circuit, amplifier circuit, and comparator circuit into a single 8mm x 8mm x 1.65mm module. Figure 2 As shown, this makes the volume smaller.

[0022] The operational amplifiers used in this solution are all bare cores, which are attached to the substrate with conductive adhesive. The pins are bonded using gold wire bonding technology with 1mil diameter gold wire. The bonding method is ultrasonic welding, the printing process is laser printing, and the packaging process is plastic encapsulation. The package type is BGA packaging, with a total of 36 pins and 36 effective pins.

[0023] This solution uses the TPH2502 operational amplifier and the TP1981 comparator. The TPH2502 operational amplifier features high bandwidth, high slew rate, and low broadband noise. The TP1981 comparator is a very fast comparator with features including an input common-mode range of -0.2V to VCC-1.5V, low noise, TTL / CM0 compatible output driver, and input shutdown.

[0024] This design presents a preamplifier circuit for laser gyroscope signal processing, comprising an integrated chip and peripheral resistors and capacitors. After the laser gyroscope outputs a signal, a weak photocurrent signal is output through a photodetector. This photocurrent signal is input to the signal receivers A1IN and B1IN of the preamplifier circuit. Figure 1As shown, operational amplifiers M1 and R3 form a transimpedance amplifier, operational amplifier M2 and R25 form a transimpedance amplifier, and operational amplifier M5, R10, and R23 form a transimpedance amplifier. The DC component of the photocurrent signal is converted into voltage C1_OUT by the transimpedance amplifiers (resistor R23 determines the IV conversion gain). The AC component of the photocurrent signal is converted into voltage signals A1_OUT and B1_OUT by the transimpedance amplifiers. Since the input bias current of operational amplifiers M1, M2, and M5 is very small, it can be ignored. The output voltages A1_OUT and B1_OUT are AC voltages that fluctuate with a certain amplitude, with reference voltage TP2 as the reference. Operational amplifiers M1 and M2 are powered by a single +5V supply. When the reference voltage TP2 is 2.5V (the midpoint between 0V and 5V), the amplitude range of the output voltages A1_OUT and B1_OUT can be maximized. The A1_OUT output from the transimpedance amplifier circuit is filtered by a high-pass filter circuit and an inverting proportional operational amplifier circuit. In this circuit, C1 and R1 form a high-pass filter circuit, C6 and R27 form a high-pass filter circuit, operational amplifier M3, R26, and C7 form an inverting proportional operational amplifier circuit, and operational amplifier M4, R2, and C2 form an inverting proportional operational amplifier circuit. After A1_OUT and B1_OUT pass through the high-pass filter circuit, the DC current is filtered out. According to the "virtual short" principle of operational amplifiers, the voltage at the non-inverting input terminal of the operational amplifier is TP2. This DC current is then applied to A2_INV and B2_INV, and after passing through the inverting proportional operational amplifier circuit and undergoing low-pass filtering, the outputs A2_OUT and B2_OUT are produced. Operational amplifiers M3 and M4 are powered by a single +5V supply, and the reference voltage TP2 is taken as 2.5V (the midpoint between 0V and 5V). This ensures that the amplitude range of the output voltages A2_OUT and B2_OUT can reach its maximum. Figure 2 As shown, the amplified signals A2_OUT and B2_OUT pass through a comparator circuit. Comparator M6, R5, and R7 form a comparator circuit, while comparator M7, R22, and R20 form another comparator circuit. The inverting input of comparators M6 and M7 is the reference voltage TP1, and the non-inverting input is connected to the input signal. The input signals A2_OUT and B2_OUT are compared with the reference voltage by comparators M6 and M7, outputting square wave signals A3_OUT and B3_OUT. Comparators M6 and M7 are powered by a single +5V supply, outputting square wave signals from 0 to 5V. Due to a certain deviation in the comparison threshold within the comparators, the duty cycle of the output square wave is less than 50%. The duty cycle of the output square wave signal can be adjusted by adjusting the pull-up resistors R14 and R16 at the input signal terminals.

[0025] Different connection methods are available for different use cases, as detailed in Table 1.

[0026] Table 1 ① When the laser gyroscope used by the user consists of an AC phototube and a DC phototube, and requires positive and negative power supply, connect the VCC terminal to +5V, connect the VEE terminal to -5V, use 100k resistors for R12 and R17, use a 0Ω resistor for R4, leave R9 unsoldered, leave R28 unsoldered, use a 0Ω resistor for R29, leave R11 unsoldered, connect the AC phototube to A1IN and B1IN, and connect the DC phototube to C_IN / D_IN (connecting the phototube anode to C_IN and the cathode to D_IN outputs negative light intensity; connecting the phototube anode to D_IN and the cathode to C_IN outputs positive light intensity).

[0027] ② When the laser gyroscope's optical signal output is composed of AC phototubes and DC phototubes, and requires a single power supply, connect the VCC terminal to +5V, connect the VEE terminal to GND, use 100k resistors for R12 and R17, use a 0Ω resistor for R4, leave R9 unsoldered, leave R28 unsoldered, use a 0Ω resistor for R29, leave R11 unsoldered, connect the AC phototube to A1IN and B1IN, connect the anode of the DC phototube to D_IN, and connect the cathode to C_IN.

[0028] ③ When the laser gyroscope's optical signal output is composed of AC / DC phototubes and requires positive and negative power supplies, connect VCC to +5V, VEE to -5V, use 10kΩ resistors for R12 and R17, leave R4 unsoldered, use 0Ω resistors for R9, R28, and R29, and leave R11 unsoldered. Connect the AC / DC phototubes to A1IN and B1IN. The DC current signal from the AC / DC phototubes is collected at the chip's C_IN terminal via resistors R12, R17, and R9. The internal operational amplifier M5 and resistor R10 form a transimpedance amplifier, and the current signal collected at the C_IN terminal outputs a voltage through the transimpedance amplifier.

[0029] ④ When the laser gyroscope's optical signal output is composed of AC / DC phototubes and requires a single power supply, connect VCC to +5V, connect VEE to GND, use 10k resistors for R12 and R17, leave R4 and R9 unsoldered, use 0Ω resistors for R28, and use 10k resistors for R29 and R11. Connect the AC / DC phototubes to A1IN and B1IN. The DC current signal from the AC / DC phototubes flows to GND through resistors R12, R17, R28, and R29. Due to the voltage drop across R29, there will be a voltage input at D_IN. Operational amplifier M5 and resistors R10 and R11 form a non-inverting amplifier, amplifying the voltage signal at the D_IN input before outputting it.

[0030] IV Conversion Circuit: Signal input A1IN is connected to one end of resistor R12 and capacitor C3. The other end of capacitor C3 is connected to the A_IN pin of the integrated chip. The other end of resistor R12 is connected to one end of resistors R4, R9, R28, and R17. The other end of resistor R4 is connected to GND. The other end of resistor R9 is connected to the C_IN pin of the integrated chip. The other end of resistor R28 is connected to one end of resistor R29 and the D_IN pin of the integrated chip. The other end of resistor R17 is connected to signal input B1IN and one end of capacitor C5. The other end of resistor R29 is connected to GND. The other end of capacitor C5 is connected to the B_IN pin of the integrated chip.

[0031] Amplifier Circuit: The A1_OUT pin of integrated chip is connected to one end of capacitor C1. The other end of capacitor C1 is connected to one end of resistor R1. The other end of resistor R1 is connected to the A2_INV pin of integrated chip and one end of capacitor C2. The other end of capacitor C2 is connected to the A2_OUT pin of integrated chip. The B1_OUT pin of integrated chip is connected to one end of capacitor C6. The other end of capacitor C6 is connected to one end of resistor R27. The other end of resistor R27 is connected to the B2_INV pin of integrated chip and one end of capacitor C7. The other end of capacitor C7 is connected to the B2_OUT pin of integrated chip. One end of resistor R11 is connected to GND. The other end of resistor R11 is connected to the C_IN pin of integrated chip and one end of resistor R23. The other end of resistor R23 is connected to the C1_OUT pin of integrated chip and one end of resistor R15. The other end of resistor R15 is connected to one end of capacitor C4. The other end of capacitor C4 is connected to GND.

[0032] Comparator circuit: The A2_OUT pin of the integrated chip is connected to one end of resistor R6; the other end of resistor R6 is connected to one end of resistor R14 and the A3_IN+ pin of the integrated chip; the other end of resistor R14 is connected to +5V and one end of resistor R16; the other end of resistor R16 is connected to one end of resistor R21 and the B3_IN+ pin of the integrated chip; the other end of resistor R21 is connected to the B2_OUT pin of the integrated chip; one end of resistor R7 is connected to the A3_IN- pin of the integrated chip; the other end of resistor R7 is connected to the TP1 pin of the integrated chip and resistor R... One end of resistor R20 is connected to the B3_IN pin of the integrated chip. One end of resistor R8 is connected to the A3_OUT pin of the integrated chip. The other end of resistor R8 is connected to one end of resistor R13 and one end of capacitor C8. The other end of resistor R13 is connected to GND. One end of resistor R18 is connected to GND and one end of capacitor C9. The other end of resistor R18 is connected to one end of resistor R19 and one end of capacitor C9. One end of resistor R19 is connected to the B3_OUT pin of the integrated chip.

[0033] The +5V power supply is connected to the VCC pin of the integrated chip and one end of the resistor R24. The other end of the resistor R24 ​​is connected to the VDD pin of the integrated chip. The -5V power supply is connected to the VEE pin of the integrated chip.

[0034] because Figure 1 and Figure 2 The laser gyroscope preamplifier circuit in the package structure is a mature circuit, therefore Figure 1 and Figure 2 Only a simplified circuit diagram is shown.

[0035] In summary, this solution integrates the preamplifier circuit functional modules and supports two photodetector methods as well as single +5V power supply and dual ±5V power supply. It includes an IV conversion circuit, an amplifier circuit, and a comparator circuit. Two opposing traveling waves within the laser cavity form alternating bright and dark interference fringes through a beam combining prism, etc. A photodetector converts this optical signal into an electrical signal. The IV conversion circuit then converts the weak photocurrent signal into a voltage signal and amplifies it. The amplifier circuit conditions the intensity and voltage signal while simultaneously filtering to reduce signal noise. Finally, the comparator circuit converts it into a square wave output.

[0036] This solution offers different connection methods for various application scenarios, supporting separate inputs of AC and DC photoelectric signals, as well as mixed AC / DC photoelectric signals. It is also compatible with both single +5V and ±5V power supplies. Furthermore, for these specific usage conditions, only the resistors and capacitors on the preamplifier circuit need to be switched, making it well-suited for a wide range of applications.

[0037] Furthermore, this solution utilizes SIP packaging technology to integrate multiple chips into a single package, reducing circuit area and improving system integration. A key challenge in laser gyroscope signal processing is ensuring the symmetry of the two signal transmission paths in the preamplifier circuit. This solution, by integrating multiple chips into a single package using SIP packaging technology, guarantees the symmetry of the preamplifier circuit, thus reducing the requirements for PCB layout during use.

[0038] Furthermore, by adding a damping resistor and an output load capacitor at the output end, this solution can quickly dissipate resonant energy, accelerate oscillation decay, reduce high-frequency components in the signal, and effectively reduce output signal ringing.

[0039] Compared to conventional preamplifier circuits, this solution boasts higher integration, fewer external components, ease of use, wider applicability, lower cost, and higher compatibility. Furthermore, the application of SIP packaging technology reduces the overall size of the circuit, shortens the distance between chips, reduces signal transmission paths, improves signal integrity and transmission speed, reduces latency, minimizes external connection points, lowers failure rates, and enhances reliability.

[0040] The embodiments described above are merely preferred embodiments of this utility model. The terms "in one embodiment," "in another embodiment," "in yet another embodiment," or "in still another embodiment" used in this specification all refer to one or more of the same or different embodiments according to this disclosure. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution should be included within the protection scope of this utility model.

Claims

1. A laser gyroscope conversion and amplification circuit, characterized in that, It includes a first AC processing circuit, a second AC processing circuit, a DC processing circuit, and a first peripheral circuit. The first AC processing circuit includes a first AC transimpedance amplifier circuit, a first high-pass filter circuit, and a first inverting proportional operational circuit. The first AC transimpedance amplifier circuit includes operational amplifier M1, and the first inverting proportional operational circuit includes operational amplifier M4. The second AC processing circuit includes a second AC transimpedance amplifier circuit, a second high-pass filter circuit, and a second inverting proportional operational circuit. The second AC transimpedance amplifier circuit includes operational amplifier M2, and the second inverting proportional operational circuit includes operational amplifier M3. The DC processing circuit includes operational amplifier M5. The first peripheral circuit includes resistors R4, R12, R9, R28, R29, and R17, and capacitors C3, C5, R23, R15, R11, and C4. The first signal input is connected to one end of resistor R12 and capacitor C3. The other end of capacitor C3 is connected to the inverting input of operational amplifier M1. The other end of resistor R12 is connected to one end of resistors R4, R9, R28, and R17. The other end of resistor R4 is connected to GND. The other end of resistor R9 is connected to the inverting input of operational amplifier M5. The other end of resistor R28 is connected to one end of resistor R29 and the non-inverting input of operational amplifier M5. The other end of resistor R17 is connected to the second signal input and one end of capacitor C5. The other end of resistor R29 is connected to GND. The other end of capacitor C5 is connected to the inverting input of operational amplifier M2. The non-inverting input terminals of operational amplifiers M1, M4, M2, and M3 are all connected to the reference voltage. The output of operational amplifier M1 is connected to the inverting input of operational amplifier M4 through a first high-pass filter circuit. The output of operational amplifier M4 forms the output of the first AC processing circuit. The output of operational amplifier M2 is connected to the inverting input of operational amplifier M3 through a second high-pass filter circuit. The output of operational amplifier M3 forms the output of the second AC processing circuit. One end of resistor R11 is connected to GND, and the other end of resistor R11 is connected to the inverting input terminal of the DC transimpedance amplifier circuit and one end of resistor R23. The other end of resistor R23 is connected to the output terminal of operational amplifier M5 and one end of resistor R15. The other end of resistor R15 is connected to one end of capacitor C4 to form the output terminal of the DC processing circuit. The other end of capacitor C4 is connected to GND.

2. The laser gyroscope conversion and amplification circuit according to claim 1, characterized in that, The first AC transimpedance amplifier circuit also includes a resistor R3. One end of the resistor R3 is connected to the inverting input terminal of the operational amplifier M1, and the other end of the resistor R3 is connected to the output terminal of the operational amplifier M1. The second AC transimpedance amplifier circuit also includes a resistor R25. One end of the resistor R25 is connected to the inverting input terminal of the operational amplifier M2, and the other end of the resistor R25 is connected to the output terminal of the operational amplifier M2. The DC processing circuit also includes a resistor R10, one end of which is connected to the inverting input terminal of the operational amplifier M5, and the other end of which is connected to the output terminal of the operational amplifier M5. The first inverting proportional operational circuit also includes a resistor R2 and a capacitor C2 connected in parallel. One connection terminal of the resistor R2 and capacitor C2 is connected to the inverting input terminal of the operational amplifier M4, and the other connection terminal of the resistor R2 and capacitor C2 is connected to the output terminal of the operational amplifier M4. The second inverting proportional operational circuit also includes a resistor R26 and a capacitor C7, which are connected in parallel. One connection terminal of the resistor R26 and capacitor C7 is connected to the inverting input terminal of the operational amplifier M3, and the other connection terminal of the resistor R26 and capacitor C7 is connected to the output terminal of the operational amplifier M3.

3. The laser gyroscope conversion and amplification circuit according to claim 1, characterized in that, The first high-pass filter circuit includes a capacitor C1 and a resistor R1. One end of the capacitor C1 is connected to the output terminal of the operational amplifier M1, and the other end of the capacitor C1 is connected to one end of the resistor R1. The other end of the resistor R1 is connected to the inverting input terminal of the operational amplifier M4. The second high-pass filter circuit includes capacitor C6 and resistor R27. One end of capacitor C6 is connected to the output terminal of operational amplifier M2, and the other end of capacitor C6 is connected to one end of resistor R27. The other end of resistor R27 is connected to the inverting input terminal of operational amplifier M3.

4. The laser gyroscope conversion and amplification circuit according to claim 2, characterized in that, It also includes a first package structure, in which a first AC transimpedance amplifier circuit, a second AC transimpedance amplifier circuit, a DC processing circuit, an operational amplifier M4, a resistor R2, an operational amplifier M3, a resistor R26, and a reference voltage are packaged in the first package structure using SIP technology.

5. The laser gyroscope conversion and amplification circuit according to claim 4, characterized in that, The first package structure has a VCC pin and a VEE pin. The positive power supply terminals of operational amplifiers M1, M2, M3, M4, and M5 are connected to the VCC pin. The negative power supply terminals of operational amplifiers M1, M2, M3, M4, and M5 are connected to the VEE pin.

6. A laser gyroscope preamplifier circuit, comprising a comparator circuit, characterized in that, It also includes the conversion amplifier circuit as described in any one of claims 1-5. The comparator circuit includes a first comparator circuit, a second comparator circuit, and a second peripheral circuit. The first comparator circuit includes a comparator M6 and a resistor R5. One end of the resistor R5 is connected to the inverting input of the comparator M6, and the other end of the resistor R5 is connected to the output of the comparator M6. The second comparator circuit includes comparator M7 and resistor R22. One end of resistor R22 is connected to the inverting input of comparator M7, and the other end of resistor R22 is connected to the output of comparator M7. The second peripheral circuit includes resistors R6, R7, R14, R16, R21, R20, R8, R19, R13, R18, capacitors C8 and C9. The output of the first AC processing circuit is connected to one end of resistor R6. The other end of resistor R6 is connected to one end of resistor R14 and the non-inverting input of comparator M6. The other end of resistor R14 is connected to the power supply and one end of resistor R16. The other end of resistor R16 is connected to one end of resistor R21 and the non-inverting input of comparator M7. The output of the second AC processing circuit is connected to the other end of resistor R21. One end of resistor R7 is connected to the inverting input of comparator M6. The other end of resistor R7 is connected to the reference voltage and one end of resistor R20. The other end of resistor R20 is connected to the inverting input of comparator M7. One end of resistor R8 is connected to the output of comparator M6. The other end of resistor R8 is connected to one end of resistor R13 and one end of capacitor C8. The other end of resistor R13 is connected to GND and one end of resistor R18, the other end of capacitor C8 is connected to GND and one end of capacitor C9, the other end of resistor R18 is connected to one end of resistor R19 and the other end of capacitor C9, one end of resistor R19 is connected to the output of comparator M7, the connection of resistor R8, resistor R13 and capacitor C8 forms the output of the first comparator circuit, and the connection of resistor R19, resistor R18 and capacitor C9 forms the output of the second comparator circuit.

7. The laser gyroscope preamplifier circuit according to claim 6, characterized in that, The comparator circuit also includes a second package structure, in which the first comparator circuit and the second comparator circuit are packaged using SIP technology.

8. The laser gyroscope preamplifier circuit according to claim 7, characterized in that, The second package structure has VSS and VDD pins. The positive power supply terminals of comparators M6 and M7 are connected to the VDD pin, and the negative power supply terminals of comparators M6 and M7 are connected to the VSS pin. The VSS pin is connected to GND, and the VDD pin is connected to the power supply through resistor R24.

9. The laser gyroscope preamplifier circuit according to claim 7, characterized in that, The second package structure has a first reference voltage pin connected to a reference voltage, and a second reference voltage pin connected to the first reference voltage pin. Resistors R7 and R20 are also connected to the second reference voltage pin.

10. A laser gyroscope, characterized in that, Includes the laser gyroscope preamplifier circuit as described in any one of claims 7-9.

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