A feedback and drive package circuit for a laser gyroscope

Abstract

The utility model discloses a kind of feedback and driving packaging circuit for laser gyroscope, including signal processing circuit and amplifier circuit, signal processing circuit has first input pin, second input pin, light intensity input pin and first output pin, amplifier circuit includes third input pin, fourth input pin, second output pin, high voltage pin, first function pin and second function pin;Signal processing circuit includes first operational amplifier, first resistance and second resistance, amplifier circuit includes second operational amplifier, third resistance, fifth resistance and triode amplifier circuit module.The utility model only needs to build different peripheral circuit environment, compatible frequency stabilization loop function or jitter loop function can be realized.

Description

Technical Field

[0001] This utility model relates to the field of inertial navigation technology, specifically to a feedback and drive packaging circuit for a laser gyroscope. Background Technology

[0002] The laser gyroscope frequency stabilization loop and mechanical jitter loop are key modules in the laser gyroscope signal processing chain. They are mainly used for DC light intensity processing, frequency stabilization driving, or mechanical jitter sensor signal detection and jitter driving of the laser gyroscope.

[0003] In the frequency stabilization loop, the main function of DC light intensity conditioning is to adjust the magnitude of the DC light intensity voltage signal to suit the subsequent ADC circuit acquisition, and simultaneously perform filtering to reduce noise in the DC light intensity voltage signal. The main function of the frequency stabilization driver is to amplify the input voltage signal to facilitate the frequency stabilization execution of the laser gyroscope, thus achieving frequency stabilization. In the jitter loop, the main function of jitter signal detection is to receive the signal output from the mechanical jitter sensor, amplify it to a suitable voltage range for subsequent ADC circuit acquisition. The main function of the jitter driver is to amplify the input voltage signal to facilitate the driving of the mechanical jitter actuator of the laser gyroscope, thus achieving mechanical frequency shifting of the laser gyroscope.

[0004] Existing technical solutions use operational amplifiers and resistors and capacitors to build frequency stabilization loop circuits or dithering loop circuits. In an IMU system, all three laser gyroscopes need to be equipped with frequency stabilization loop circuits and dithering loop circuits. Considering that the gyroscope control circuit in an IMU system is limited by area and power consumption, the implementation is relatively complex. Utility Model Content

[0005] To address the problems in the background technology, this utility model proposes a feedback and drive packaged circuit for laser gyroscopes that can realize both frequency stabilization loop function and dithering loop function.

[0006] The present invention adopts the following technical solution: A feedback and drive packaged circuit for a laser gyroscope includes a signal processing circuit and an amplification circuit. The signal processing circuit has a first input pin, a second input pin, a light intensity input pin, and a first output pin. The amplification circuit includes a third input pin, a fourth input pin, a second output pin, a high voltage pin, a first functional pin, and a second functional pin. The signal processing circuit includes a first operational amplifier, a first resistor, and a second resistor. The non-inverting input of the first operational amplifier and one end of the first resistor are both connected to the first input pin, and the other end of the first resistor is connected to the light intensity input pin. The inverting input of the first operational amplifier and one end of the second resistor are both connected to the second input pin, and the other end of the second resistor and the output terminal of the first operational amplifier are both connected to the first output pin. The amplifier circuit includes a second operational amplifier, a third resistor, a fifth resistor, and a transistor amplifier module. The inverting input of the second operational amplifier is connected to the fourth input pin, and the non-inverting input of the second operational amplifier is connected to one end of the third resistor and the third input pin. The transistor amplifier module has a first input terminal, a second input terminal, an output terminal, a first lead-out terminal, a second lead-out terminal, and a discharge terminal. The other end of the third resistor, the output terminal of the transistor amplifier module, and the second output pin are connected. The first lead-out terminal of the transistor amplifier module is connected to the first functional pin, the second lead-out terminal of the transistor amplifier module is connected to the second functional pin, the second input terminal of the transistor amplifier module is connected to the high voltage pin, one end of the fifth resistor is connected to the output terminal of the second operational amplifier, and the other end of the fifth resistor is connected to the first input terminal of the transistor amplifier module.

[0007] Optionally, the transistor amplifier circuit module includes a fourth resistor, a diode, a first transistor, and a second transistor. The base of the second transistor forms the first input terminal of the transistor amplifier circuit module. The emitter of the second transistor is connected to GND and forms the discharge terminal of the transistor amplifier circuit module. The anode of the diode is connected to the other end of the third resistor, and the connection point of the two forms the output terminal of the transistor amplifier circuit module. The cathode of the diode, one end of the fourth resistor, the base of the first transistor, and the collector of the second transistor are connected, and the connection point of the four forms the first lead of the transistor amplifier circuit module. The other end of the fourth resistor is connected to the collector of the first transistor, and the connection point of the two forms the second input terminal of the transistor amplifier circuit module. The emitter of the first transistor forms the second lead of the transistor amplifier circuit module.

[0008] Optionally, it also includes peripheral circuitry, which includes a sixth, seventh, eighth, ninth, tenth, and eleventh resistor. The light intensity signal is connected to the light intensity input pin. The light intensity modulation signal is connected to one end of the tenth and eighth resistors. The other end of the tenth resistor is connected to the ninth resistor and the first input pin. The other end of the ninth resistor is grounded. The other end of the eighth resistor is connected to the sixth, seventh, and second input pins. The other end of the sixth resistor is grounded. The other end of the seventh resistor is connected to the first output pin of the integrated chip. The frequency stabilization control signal is connected to the fourth input pin. One end of the eleventh resistor is connected to GND. The other end of the eleventh resistor is connected to the third input pin. The second function pin is connected to the second output pin.

[0009] Optionally, the sixth and tenth resistors are left unsoldered, or the seventh, eighth and ninth resistors are left unsoldered.

[0010] Optionally, the peripheral circuit includes a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a first capacitor, and a second capacitor. The jitter current signal is connected to one end of the twelfth resistor, one end of the thirteenth resistor, and one end of the first capacitor. The other ends of the twelfth and thirteenth resistors are connected to GND. The other end of the first capacitor is connected to one end of the fourteenth resistor. The other end of the fourteenth resistor is connected to the second input pin. The first input pin is connected to a positive voltage. The jitter control signal is connected to the fourth input pin, one end of the fifteenth resistor is connected to GND, the other end of the fifteenth resistor is connected to the third input pin, the first function pin is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor is connected to the high voltage power supply, the second function pin is connected to the second output pin, one end of the second capacitor, and the other end of the second capacitor is connected to the high voltage analog signal.

[0011] Optionally, it also includes a packaging structure, in which the signal processing circuit and the amplification circuit are packaged using SIP technology.

[0012] Optionally, three signal processing circuits and three amplifier circuits are provided.

[0013] Optionally, the package circuit includes a +Vs pin, a -Vs pin, and a GND pin. The positive power supply terminals of the first operational amplifier and the second operational amplifier are both connected to the +Vs pin, and the negative power supply terminals of the first operational amplifier and the second operational amplifier are both connected to the -Vs pin.

[0014] Compared with the prior art, the advantages of this utility model are: This invention integrates the frequency stabilization or jittering function modules of a laser gyroscope through packaging circuit design. It allows for compatibility with either frequency stabilization or jittering loop functions by simply setting up different peripheral circuit environments. When used as a frequency stabilization loop, the signal processing circuit functions as a DC light intensity conditioning circuit, and the amplification circuit functions as a frequency stabilization drive circuit. The laser gyroscope's optical signal, after passing through a photodetector and preamplifier, outputs a voltage signal. This voltage signal is then conditioned by the DC light intensity conditioning circuit in the frequency stabilization loop to a suitable level for ADC acquisition, while also undergoing filtering and noise reduction. Simultaneously, after the ADC acquires the voltage signal, the DAC output voltage signal is amplified by the frequency stabilization drive circuit to drive the laser gyroscope's frequency stabilization. When used as a jittering loop, the signal processing circuit functions as a jitter signal detection circuit, and the amplification circuit functions as a jitter drive circuit. When the laser gyroscope jitters, a signal is generated. After passing through the jitter signal detection circuit, this signal is amplified to a suitable level for ADC acquisition. Meanwhile, after the ADC acquires the voltage signal, the DAC outputs the voltage signal, which is amplified by the jitter drive circuit to drive the jitter of the laser gyroscope. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a circuit diagram of the first frequency stabilization loop in this embodiment of the present invention.

[0017] Figure 2 This is a circuit diagram illustrating the principle structure of the second frequency stabilization loop in this embodiment of the present invention.

[0018] Figure 3 This is a circuit diagram of the third frequency stabilization loop in this embodiment of the present invention.

[0019] Figure 4 This is a circuit diagram illustrating the principle structure of the first jitter loop in an embodiment of this utility model.

[0020] Figure 5 This is a circuit diagram illustrating the principle structure of the second jitter loop in an embodiment of this utility model.

[0021] Figure 6 This is a circuit diagram illustrating the principle structure of the third jitter loop in this embodiment of the present invention. Detailed Implementation

[0022] 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.

[0023] like Figures 1-6 As shown, this embodiment provides a feedback and drive package circuit for a laser gyroscope, including a signal processing circuit and an amplification circuit. The signal processing circuit has a first input pin, a second input pin, a light intensity input pin, and a first output pin. The amplification circuit includes a third input pin, a fourth input pin, a second output pin, a high voltage pin, a first functional pin, and a second functional pin. The signal processing circuit includes a first operational amplifier, a first resistor, and a second resistor. The non-inverting input of the first operational amplifier and one end of the first resistor are both connected to the first input pin, and the other end of the first resistor is connected to the light intensity input pin. The inverting input of the first operational amplifier and one end of the second resistor are both connected to the second input pin, and the other end of the second resistor and the output terminal of the first operational amplifier are both connected to the first output pin. The amplifier circuit includes a second operational amplifier, a third resistor, a fifth resistor, and a transistor amplifier module. The inverting input of the second operational amplifier is connected to the fourth input pin, and the non-inverting input of the second operational amplifier is connected to one end of the third resistor and the third input pin. The transistor amplifier module has a first input terminal, a second input terminal, an output terminal, a first lead-out terminal, a second lead-out terminal, and a discharge terminal. The other end of the third resistor, the output terminal of the transistor amplifier module, and the second output pin are connected. The first lead-out terminal of the transistor amplifier module is connected to the first functional pin, the second lead-out terminal of the transistor amplifier module is connected to the second functional pin, the second input terminal of the transistor amplifier module is connected to the high voltage pin, one end of the fifth resistor is connected to the output terminal of the second operational amplifier, and the other end of the fifth resistor is connected to the first input terminal of the transistor amplifier module.

[0024] This invention integrates the frequency stabilization or jittering function modules of a laser gyroscope through packaging circuit design. It allows for compatibility with either frequency stabilization or jittering loop functions by simply setting up different peripheral circuit environments. When used as a frequency stabilization loop, the signal processing circuit functions as a DC light intensity conditioning circuit, and the amplification circuit functions as a frequency stabilization drive circuit. The laser gyroscope's optical signal, after passing through a photodetector and preamplifier, outputs a voltage signal. This voltage signal is then conditioned by the DC light intensity conditioning circuit in the frequency stabilization loop to a suitable level for ADC acquisition, while also undergoing filtering and noise reduction. Simultaneously, after the ADC acquires the voltage signal, the DAC output voltage signal is amplified by the frequency stabilization drive circuit to drive the laser gyroscope's frequency stabilization. When used as a jittering loop, the signal processing circuit functions as a jitter signal detection circuit, and the amplification circuit functions as a jitter drive circuit. When the laser gyroscope jitters, a signal is generated. After passing through the jitter signal detection circuit, this signal is amplified to a suitable level for ADC acquisition. Meanwhile, after the ADC acquires the voltage signal, the DAC outputs the voltage signal, which is amplified by the jitter drive circuit to drive the jitter of the laser gyroscope.

[0025] The transistor amplifier circuit module includes a fourth resistor, a diode, a first transistor, and a second transistor. The base of the second transistor forms the first input terminal of the transistor amplifier circuit module. The emitter of the second transistor is connected to GND and forms the discharge terminal of the transistor amplifier circuit module. The anode of the diode is connected to the other end of the third resistor, and the connection point of the two forms the output terminal of the transistor amplifier circuit module. The cathode of the diode, one end of the fourth resistor, the base of the first transistor, and the collector of the second transistor are connected, and the connection point of the four forms the first lead of the transistor amplifier circuit module. The other end of the fourth resistor is connected to the collector of the first transistor, and the connection point of the two forms the second input terminal of the transistor amplifier circuit module. The emitter of the first transistor forms the second lead of the transistor amplifier circuit module.

[0026] This invention designs a transistor amplifier circuit module. The module consists of a fourth resistor, a diode, a first transistor, and a second transistor. The module's leads are connected to a high-voltage pin, a first functional pin, a second functional pin, a second output pin, a fifth resistor, and GND. The VG voltage amplifies the output signal of the second operational amplifier (the amplified voltage is at most VG). The first lead and its output can control loop power consumption and output capability. The output is the amplified frequency stabilization control signal. The fifth resistor's connection point is the module's input terminal, and the GND connection point is the transistor amplifier circuit's discharge terminal.

[0027] The packaged circuit of this embodiment also includes peripheral circuitry. When the packaged circuit of this embodiment is used as a frequency stabilization loop for a laser gyroscope, the peripheral circuitry includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor. The light intensity signal is connected to the light intensity input pin. The light intensity modulation signal is connected to one end of the tenth and eighth resistors. The other end of the tenth resistor is connected to the ninth resistor and the first input pin. The other end of the ninth resistor is grounded. The other end of the eighth resistor is connected to the sixth, seventh, and second input pins. The other end of the sixth resistor is grounded. The other end of the seventh resistor is connected to the first output pin of the integrated chip. The frequency stabilization control signal is connected to the fourth input pin. One end of the eleventh resistor is connected to GND. The other end of the eleventh resistor is connected to the third input pin. The second functional pin is connected to the second output pin.

[0028] In the aforementioned peripheral circuit, the sixth and tenth resistors are not soldered, or the seventh, eighth, and ninth resistors are not soldered.

[0029] When the packaged circuit of this embodiment is used as a laser gyroscope jitter loop, the peripheral circuit includes a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a first capacitor, and a second capacitor. The jitter current signal is connected to one end of the twelfth resistor, one end of the thirteenth resistor, and one end of the first capacitor. The other ends of the twelfth and thirteenth resistors are connected to GND. The other end of the first capacitor is connected to one end of the fourteenth resistor. The other end of the fourteenth resistor is connected to the second input pin. The first input pin is connected to a positive voltage. The jitter control signal is connected to the fourth input pin, one end of the fifteenth resistor is connected to GND, the other end of the fifteenth resistor is connected to the third input pin, the first function pin is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor is connected to the high voltage power supply, the second function pin is connected to the second output pin, one end of the second capacitor, and the other end of the second capacitor is connected to the high voltage analog signal.

[0030] The packaging circuit in this embodiment also includes a packaging structure, in which the signal processing circuit and the amplification circuit are packaged using SIP technology.

[0031] There are three signal processing circuits and three amplifier circuits.

[0032] The packaged circuit has a +Vs pin, a -Vs pin, and a GND pin. The positive power supply terminals of the first operational amplifier and the second operational amplifier are both connected to the +Vs pin, and the negative power supply terminals of the first operational amplifier and the second operational amplifier are both connected to the -Vs pin.

[0033] The purpose of this utility model is to design a circuit that is compatible with frequency stabilization and jitter of three-channel laser gyroscopes, which is more compatible, adaptable, and smaller in size than existing solutions.

[0034] The schematic diagram of this utility model has two application scenarios, such as... Figures 1-3 The diagram shows the use of the frequency stabilization loop function, such as... Figures 4-6 For use with the jitter loop function, see Figure 1- Figure 6 The area within the dashed lines represents the signal processing and amplification circuits, while the others are peripheral adjustment circuits. This invention utilizes the latest SIP technology to integrate three signal processing and amplification circuits into a single 12mm x 12mm x 2.62mm module, resulting in a smaller size.

[0035] The operational amplifiers used in this invention 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. The packaging process is plastic encapsulation with BGA packaging. There are a total of 96 pins, with 74 effective pins.

[0036] The chip in this invention mainly uses the TPA1882 operational amplifier. The TPA1882 operational amplifier is an operational amplifier with features such as high precision, wide voltage range, high bandwidth, and high performance rail-to-rail output.

[0037] The integrated chip used in this utility model design is such as Figures 1-6The area within the dashed lines represents the internal structure of the same chip. M1, M2, M3, M4, M5, and M6 are TPA1882 operational amplifiers, and their power supplies are connected to +Vs and -Vs, respectively. The non-inverting input of operational amplifier M1 is connected to one end of resistor R1 and the integrated chip pin M1+, while the other end of resistor R1 is connected to the integrated chip pin IN1. The inverting input of operational amplifier M1 is connected to one end of resistor R2 and the integrated chip pin M1-, while the other end of resistor R2 is connected to the output terminal of operational amplifier M1 and the integrated chip pin OUT1. The inverting input of operational amplifier M4 is connected to the M4- pin of the integrated circuit chip. The non-inverting input of operational amplifier M4 is connected to one end of resistor R3 and the M4+ pin of the integrated circuit chip. The other end of resistor R3 is connected to the OUT4 pin of the integrated circuit chip and the anode of diode D1. The cathode of diode D1 is connected to the B1 pin of the integrated circuit chip, one end of resistor R4, the base of transistor Q1, and the collector of transistor Q2. The other end of resistor R4 is connected to the VG pin of the integrated circuit chip and the collector of transistor Q1. The emitter of transistor Q1 is connected to the C1 pin of the integrated circuit chip. The base of transistor Q2 is connected to one end of resistor R5. The other end of resistor R5 is connected to the output of operational amplifier M4. The emitter of transistor Q2 is connected to the GND pin of the integrated circuit chip. The non-inverting input of operational amplifier M2 is connected to one end of resistor R6 and the integrated chip pin M2+, and the other end of resistor R6 is connected to the integrated chip pin IN2. The inverting input of operational amplifier M2 is connected to one end of resistor R7 and the integrated chip pin M2-, and the other end of resistor R7 is connected to the output terminal of operational amplifier M2 and the integrated chip pin OUT2. The inverting input of operational amplifier M5 is connected to the M5- pin of the integrated circuit chip. The non-inverting input of operational amplifier M5 is connected to one end of resistor R8 and the M5+ pin of the integrated circuit chip. The other end of resistor R8 is connected to the OUT5 pin of the integrated circuit chip and the anode of diode D2. The cathode of diode D2 is connected to the B2 pin of the integrated circuit chip, one end of resistor R9, the base of transistor Q3, and the collector of transistor Q4. The other end of resistor R9 is connected to the VG pin of the integrated circuit chip and the collector of transistor Q3. The emitter of transistor Q3 is connected to the C2 pin of the integrated circuit chip. The base of transistor Q4 is connected to one end of resistor R10. The other end of resistor R10 is connected to the output of operational amplifier M5. The emitter of transistor Q4 is connected to the GND pin of the integrated circuit chip. The non-inverting input of operational amplifier M3 is connected to one end of resistor R11 and the integrated chip pin M3+, and the other end of resistor R11 is connected to the integrated chip pin IN3. The inverting input of operational amplifier M3 is connected to one end of resistor R12 and the integrated chip pin M3-, and the other end of resistor R12 is connected to the output terminal of operational amplifier M3 and the integrated chip pin OUT3.The inverting input of operational amplifier M6 is connected to the M6- pin of the integrated circuit chip. The non-inverting input of operational amplifier M6 is connected to one end of resistor R13 and the M6+ pin of the integrated circuit chip. The other end of resistor R13 is connected to the OUT6 pin of the integrated circuit chip and the anode of diode D3. The cathode of diode D3 is connected to the B3 pin of the integrated circuit chip, one end of resistor R14, the base of transistor Q5, and the collector of transistor Q6. The other end of resistor R14 is connected to the VG pin of the integrated circuit chip and the collector of transistor Q5. The emitter of transistor Q5 is connected to the C3 pin of the integrated circuit chip. The base of transistor Q6 is connected to one end of resistor R15. The other end of resistor R15 is connected to the output of operational amplifier M6. The emitter of transistor Q6 is connected to the GND pin of the integrated circuit chip.

[0038] This invention optimizes the output capability and power consumption of the gyroscope's frequency stabilization loop and dithering loop. External connections to pins B1 / B2 / B3 and C1 / C2 / C3 reduce loop power consumption and increase output capability. Connecting a series resistor to high voltage on pins B1 / B2 / B3 further reduces loop power consumption. Connecting a Darlington transistor after pins B1 / B2 / B3 and C1 / C2 / C3 increases output capability. For loops with sufficient output capability, this method can reduce the overall loop power consumption. Different types of gyroscopes require different driving capabilities for the dithering loop; connecting a Darlington transistor can increase the dithering driving capability.

[0039] In this design, resistors R4 / R9 / R14, transistors Q1 / Q3 / Q5, diodes D1 / D2 / D3, and transistors Q2 / Q4 / Q6 form a transistor amplifier circuit module. The module's output terminals are connected to VG, B1 / 2 / 3, C1 / 2 / 3, OUT4 / 5 / 6, one end of resistors R5 / R10 / R15, and GND. The VG voltage amplifies the output signal of operational amplifiers M4 / 5 / 6 (the amplified voltage is at most VG). The output terminals of B1 / B2 / B3 and C1 / C2 / C3 control the loop power consumption and output capability. OUT4 / 5 / 6 is the amplified frequency stabilization control signal. The connection terminal of resistors R5 / R10 / R15 is the input terminal of this module. The GND connection terminal is the discharge terminal of the transistor amplifier circuit.

[0040] This invention presents a circuit capable of both frequency stabilization and jittering of three-channel laser gyroscopes. Both circuits are composed of a self-developed chip and external resistors and capacitors. The following description covers two application scenarios.

[0041] (1) such as Figures 1-3 Used as a frequency stabilization loop circuit, the resistors in the three frequency stabilization loops are shown in Table 1, and the pins in the three frequency stabilization loops are shown in Table 2: Table 1 Table 2 ① Light intensity protection circuit: The light intensity protection circuit has different connection methods for different application scenarios, as detailed in Table 3.

[0042] Table 3 When the laser gyroscope preamplifier circuit used by the user outputs positive light intensity, resistor R16 is unsoldered, resistor R20 uses an 11kΩ resistor, resistor R22 uses a 39kΩ resistor, resistor R24 ​​is unsoldered, and resistor R17 uses a 200kΩ resistor. The light intensity signal is input to the IN1 terminal of the light intensity conditioning circuit. The light intensity is divided by resistors R1 and R22 and input to the non-inverting input of operational amplifier M1 as LDC_X / (R1+R22) ×R22. According to the "virtual short" principle, the voltage at the inverting input terminal of the operational amplifier is LDC_X / (R1+R22) ×R22. Operational amplifier M1, resistors R20, R2, and R17 constitute the inverting amplifier. This part of the operational amplifier performs modulation output and DAC input according to the user software settings. In the light intensity conditioning circuit, the relationship between the output AD_LDC_X and DA_LIN_X is: When the laser gyroscope preamplifier circuit used by the user outputs negative light intensity, resistor R16 is a 30kΩ resistor, resistor R20 and R22 are unsoldered, resistor R24 ​​is a 20kΩ resistor, and resistor R17 is unsoldered. The light intensity signal is input to the IN1 terminal of the light intensity processing circuit. Operational amplifier M1, resistors R24, R1, R16, and R2 form a non-inverting amplifier. The non-inverting input of operational amplifier M1 is DA_LDC_X / (R24+R1) ×R1+LDC_X / (R24+R1) ×R24. According to the "virtual short" principle, the voltage at the inverting input of the operational amplifier is DA_LDC_X / (R24+R1) ×R1+LDC_X / (R24+R1) ×R24. This part of the operational amplifier performs modulation output and DAC input according to the user software settings. The relationship between the output AD_LDC_X and DA_LIN_X is: The light intensity conditioning circuits of operational amplifiers M2 and M3 are the same as those of M1, and will not be described in detail.

[0043] Connection method: The light intensity input terminal LDC_X is connected to the IN1 pin of the integrated chip. The DA signal input DA_LIN_X is connected to one end of resistors R24 and R20. The other end of resistor R24 ​​is connected to resistor R22 and the M1+ pin of the integrated chip. The other end of resistor R22 is connected to GND. The other end of resistor R20 is connected to resistors R16 and R17 and the M1- pin of the integrated chip. The other end of resistor R16 is connected to GND. The other end of resistor R17 is connected to the OUT1 pin of the integrated chip.

[0044] The light intensity input terminal LDC_Y is connected to the IN2 pin of the integrated chip. The DA signal input DA_LIN_Y is connected to one end of resistors R32 and R30. The other end of resistor R32 is connected to resistor R31 and the M2+ pin of the integrated chip. The other end of resistor R31 is connected to GND. The other end of resistor R30 is connected to resistors R28 and R29 and the M2- pin of the integrated chip. The other end of resistor R28 is connected to GND. The other end of resistor R29 is connected to the OUT2 pin of the integrated chip.

[0045] The light intensity input terminal LDC_Z is connected to the IN3 pin of the integrated chip. The DA signal input DA_LIN_Z is connected to one end of resistors R25 and R21. The other end of resistor R25 is connected to resistor R23 and the M3+ pin of the integrated chip. The other end of resistor R23 is connected to GND. The other end of resistor R21 is connected to resistors R18 and R19 and the M3- pin of the integrated chip. The other end of resistor R18 is connected to GND. The other end of resistor R19 is connected to the OUT3 pin of the integrated chip.

[0046] ② Frequency-stabilized drive circuit: When the user continuously monitors the light intensity of the laser gyroscope, the controller algorithm calculates the direction and magnitude of the piezoelectric ceramic driving voltage that needs to be adjusted, and outputs DA_PLC_X. The high voltage VG, resistor R4 and transistor Q1 pull up the frequency-stabilized driving signal. The operational amplifier M4, resistor and resistor R3 form an inverting amplifier to amplify the controller output signal and generate a high voltage analog signal sufficient to drive the piezoelectric ceramic.

[0047] In the frequency-stabilized drive circuit, the relationship between the output AX and DA_PLC_X is as follows: The light intensity conditioning circuits of operational amplifiers M5 and M6 are the same as those of M3, and will not be described in detail.

[0048] Connection method: The DA signal input DA_PLC_X is connected to pin M4- of the integrated chip, resistor R26 is connected to GND and M4+ of the integrated chip, and pin C1 of the integrated chip is connected to OUT4.

[0049] The DA signal input DA_PLC_Y is connected to pin M5- of the integrated chip, resistor R33 is connected to GND and M5+ of the integrated chip, and pin C2 of the integrated chip is connected to OUT5.

[0050] The DA signal input DA_PLC_Z is connected to pin M6- of the integrated chip, resistor R27 is connected to GND and M6+ of the integrated chip, and pin C3 of the integrated chip is connected to OUT6.

[0051] like Figures 4-6 It is used as a jitter loop circuit. The resistors in the three jitter loops are shown in Table 4, and the pins in the three jitter loops are shown in Table 2. Table 4 ① Jitter signal detection circuit: When the user needs to detect the jitter feedback signal, in the circuit, PIA_X / PIA_Y / PIA_Z are the output current signals of the jitter sensor. At this time, the amplification factor is R2 / R36. By applying a 1.25V bias voltage to the non-inverting pins of M1 / M2 / M3, the voltage of OUT1 / 2 / 3 can be adjusted to between 0 and 2.5V, which is convenient for ADC sampling.

[0052] Connection method: The jitter current signal input PIA_X is connected to one end of resistor R34, one end of resistor R35 and one end of capacitor C1. The other ends of resistor R34 and resistor R35 are connected to GND. The other end of capacitor C1 is connected to one end of resistor R36. The other end of resistor R36 is connected to pin M1- of the integrated chip. +1.25V is connected to pin M1+ of the integrated chip.

[0053] The jitter current signal input PIA_Y is connected to one end of resistor R39, one end of resistor R40, and one end of capacitor C3. The other ends of resistors R39 and R40 are connected to GND. The other end of capacitor C3 is connected to one end of resistor R41. The other end of resistor R41 is connected to pin M2- of the integrated chip. +1.25V is connected to pin M2+ of the integrated chip.

[0054] The jitter current signal input PIA_Z is connected to one end of resistor R44, one end of resistor R45, and one end of capacitor C5. The other ends of resistors R44 and R45 are connected to GND. The other end of capacitor C5 is connected to one end of resistor R46. The other end of resistor R46 is connected to pin M3- of the integrated chip. +1.25V is connected to pin M3+ of the integrated chip.

[0055] ② Jitter drive circuit: When the user continuously collects jitter feedback signals, the control algorithm calculates the signal adjusted by the jitter sensor and outputs DA_DIT. The high voltage VG, resistor R4 and transistor Q1 pull up the jitter drive signal. The operational amplifier M4, resistor R37 and resistor R3 form an inverting amplifier to amplify the controller output signal. The DC is blocked by capacitor C2 to generate a high voltage analog signal to drive the jitter sensor.

[0056] In the jitter drive circuit, the relationship between the outputs DIT_X and DA_DIT_X is as follows: The light intensity conditioning circuits of operational amplifiers M5 and M6 are similar to the dithering drive circuit of M4, and will not be described in detail.

[0057] Connection method: The DA signal input DA_DIT_X is connected to the M4- pin of the integrated chip. Resistor R37 is connected to GND and the M4+ pin of the integrated chip. The B1 pin of the integrated chip is connected to one end of resistor R38, and the other end of resistor R38 is connected to VG. The C1 pin of the integrated chip is connected to OUT4 and one end of capacitor C2, and the other end of resistor C2 is connected to DIT_X.

[0058] The DA signal input DA_DIT_Y is connected to the M5- pin of the integrated chip. Resistor R42 is connected to GND and the M5+ pin of the integrated chip. The B2 pin of the integrated chip is connected to one end of resistor R43, and the other end of resistor R43 is connected to VG. The C2 pin of the integrated chip is connected to OUT5 and one end of capacitor C4, and the other end of resistor C4 is connected to DIT_Y.

[0059] The DA signal input DA_DIT_Z is connected to the M6- pin of the integrated chip. Resistor R47 is connected to GND and the M6+ pin of the integrated chip. The B3 pin of the integrated chip is connected to one end of resistor R48, and the other end of resistor R48 is connected to VG. The C3 pin of the integrated chip is connected to OUT6 and one end of capacitor C6, and the other end of resistor C6 is connected to DIT_Z.

[0060] 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 should be included within the protection scope of this utility model.

Claims

1. A feedback and drive packaged circuit for a laser gyroscope, characterized in that, It includes a signal processing circuit and an amplifier circuit. The signal processing circuit has a first input pin, a second input pin, a light intensity input pin, and a first output pin. The amplifier circuit includes a third input pin, a fourth input pin, a second output pin, a high voltage pin, a first functional pin, and a second functional pin. The signal processing circuit includes a first operational amplifier, a first resistor, and a second resistor. The non-inverting input of the first operational amplifier and one end of the first resistor are both connected to the first input pin, and the other end of the first resistor is connected to the light intensity input pin. The inverting input of the first operational amplifier and one end of the second resistor are both connected to the second input pin, and the other end of the second resistor and the output terminal of the first operational amplifier are both connected to the first output pin. The amplifier circuit includes a second operational amplifier, a third resistor, a fifth resistor, and a transistor amplifier module. The inverting input of the second operational amplifier is connected to the fourth input pin, and the non-inverting input of the second operational amplifier is connected to one end of the third resistor and the third input pin. The transistor amplifier module has a first input terminal, a second input terminal, an output terminal, a first lead-out terminal, a second lead-out terminal, and a discharge terminal. The other end of the third resistor, the output terminal of the transistor amplifier module, and the second output pin are connected. The first lead-out terminal of the transistor amplifier module is connected to the first functional pin, the second lead-out terminal of the transistor amplifier module is connected to the second functional pin, the second input terminal of the transistor amplifier module is connected to the high voltage pin, one end of the fifth resistor is connected to the output terminal of the second operational amplifier, and the other end of the fifth resistor is connected to the first input terminal of the transistor amplifier module.

2. The feedback and drive packaging circuit for a laser gyroscope according to claim 1, characterized in that, The transistor amplifier circuit module includes a fourth resistor, a diode, a first transistor, and a second transistor. The base of the second transistor forms the first input terminal of the transistor amplifier circuit module. The emitter of the second transistor is connected to GND and forms the discharge terminal of the transistor amplifier circuit module. The anode of the diode is connected to the other end of the third resistor, and the connection point of the two forms the output terminal of the transistor amplifier circuit module. The cathode of the diode, one end of the fourth resistor, the base of the first transistor, and the collector of the second transistor are connected, and the connection point of the four forms the first lead of the transistor amplifier circuit module. The other end of the fourth resistor is connected to the collector of the first transistor, and the connection point of the two forms the second input terminal of the transistor amplifier circuit module. The emitter of the first transistor forms the second lead of the transistor amplifier circuit module.

3. The feedback and drive packaging circuit for a laser gyroscope according to claim 1, characterized in that, It also includes peripheral circuitry, which includes a sixth, seventh, eighth, ninth, tenth, and eleventh resistor. The light intensity signal is connected to the light intensity input pin. The light intensity modulation signal is connected to one end of the tenth and eighth resistors. The other end of the tenth resistor is connected to the ninth resistor and the first input pin. The other end of the ninth resistor is grounded. The other end of the eighth resistor is connected to the sixth, seventh, and second input pins. The other end of the sixth resistor is grounded. The other end of the seventh resistor is connected to the first output pin of the integrated chip. The frequency stabilization control signal is connected to the fourth input pin. One end of the eleventh resistor is connected to GND. The other end of the eleventh resistor is connected to the third input pin. The second function pin is connected to the second output pin.

4. The feedback and drive packaging circuit for a laser gyroscope according to claim 3, characterized in that, The sixth and tenth resistors are left unconnected, or the seventh, eighth and ninth resistors are left unconnected.

5. The feedback and drive packaging circuit for a laser gyroscope according to claim 1, characterized in that, The peripheral circuit includes a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a first capacitor, and a second capacitor. The jitter current signal is connected to one end of the twelfth resistor, one end of the thirteenth resistor, and one end of the first capacitor. The other ends of the twelfth and thirteenth resistors are connected to GND. The other end of the first capacitor is connected to one end of the fourteenth resistor. The other end of the fourteenth resistor is connected to the second input pin. The first input pin is connected to the positive voltage. The jitter control signal is connected to the fourth input pin, one end of the fifteenth resistor is connected to GND, the other end of the fifteenth resistor is connected to the third input pin, the first function pin is connected to one end of the sixteenth resistor, the other end of the sixteenth resistor is connected to the high voltage power supply, the second function pin is connected to the second output pin, one end of the second capacitor, and the other end of the second capacitor is connected to the high voltage analog signal.

6. The feedback and drive packaging circuit for a laser gyroscope according to any one of claims 1-5, characterized in that, It also includes a packaging structure, in which signal processing circuitry and amplification circuitry are packaged using SiP technology.

7. The feedback and drive packaging circuit for a laser gyroscope according to claim 6, characterized in that, There are three signal processing circuits and three amplifier circuits.

8. The feedback and drive packaging circuit for a laser gyroscope according to claim 6, characterized in that, The packaged circuit has a +Vs pin, a -Vs pin, and a GND pin. The positive power supply terminals of the first operational amplifier and the second operational amplifier are both connected to the +Vs pin, and the negative power supply terminals of the first operational amplifier and the second operational amplifier are both connected to the -Vs pin.

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