Optical-fiber gyroscope pre-amplification circuit based on switch capacitance integrator

Abstract

The invention discloses an optical-fiber gyroscope front-mounted amplification circuit based on a switch capacitance integrator, which belongs to the technical field of weak signal detection and optical-fiber gyroscope inertia measurement. The switch capacitance integrator comprises an operation amplifier, a first high-speed analog switch, a second high-speed analog switch and a precision capacitor; and the switch capacitance integrator is used for substituting for an FET amplification circuit and a subsequent cascade amplification circuit in an original optical-fiber gyroscope photoelectric conversion element, so that the complexity of the circuit is reduced, the circuit dimension is reduced, no heat noise is produced, and the signal-to-noise ratio of the circuit is increased; and meanwhile, by virtue of the way for dynamically adjusting the circuit gain by virtue of the integral time, the sampling data of an analog-to-digital converter does not need to be accumulated by a logic controller, so that the clock frequency of the analog-to-digital converter can be effectively reduced, the reduction of noise and interference can be facilitated, and the circuit power consumption can be further reduced.

Description

technical field [0001] The invention belongs to the technical field of weak signal detection and fiber optic gyroscope inertial measurement, and in particular relates to a fiber optic gyroscope preamplifier circuit based on a switched capacitor integrator. Background technique [0002] Fiber optic gyroscope is an angular velocity sensor based on the Sagnac effect, which is widely used in the field of inertial measurement. The interfering light containing angular velocity information is photoelectrically converted through the PIN photodiode. The PIN photodiode is also called the PIN diode. It is the middle region of the PN junction between the two semiconductors, that is, the I-type layer is generated between the P region and the N region. A photodetector that absorbs light radiation and generates a photocurrent. This photodetector has the advantages of small junction capacitance, short transit time, and high sensitivity. The typical value of the output current of the PIN di...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of complex cascade amplifier circuit structure, low integration, and difficulty in realizing low power consumption and miniaturization in the existing closed-loop fiber optic gyroscope structure, the present invention proposes a fiber optic gyroscope preamplifier circuit based on a switched capacitor integrator. Replace the FET amplifier circuit and cascade amplifier circuit in the existing closed-loop fiber optic gyro structure, and connect it between the output terminal of the PIN diode and the A / D input terminal of the analog-to-digital converter

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