Gyroscope two-phase sampling front-end amplifier and gyroscope signal sampling control method

Abstract

The invention discloses a gyroscope two-phase sampling front-end amplifier. The gyroscope two-phase sampling front-end amplifier comprises an operational amplifier, a power supply, a first switch pair and a second switch pair, a plurality of charging and discharging devices and a clock source, wherein the operational amplifier is connected with the upper pole plate connection end and the lower pole plate connection end of a gyroscope sensor model circuit; the power supply is connected between the gyroscope sensor model circuit and the operational amplifier; the first switch pair and the second switch pair are connected between the power supply and the operational amplifier; the plurality of charging and discharging devices are arranged in the gyroscope sensor model circuit and the operational amplifier, connected with the power supply and used for charging according to the closing of the first switch pair and discharging according to the closing of the second switch pair. By virtue of the gyroscope two-phase sampling front-end amplifier, the problem that the middle polar plate of the existing gyroscope circuit front-end amplifier cannot be directly connected with the ground can be solved; the gyroscope two-phase sampling front-end amplifier is insensitive to the common mode voltage drift; the error caused by mismatching of reference capacitors can be eliminated; the imbalance and low-frequency noise of the circuit can be reduced. The invention also discloses a signal sampling control method integrated with the gyroscope two-phase sampling front-end amplifier.

Description

technical field [0001] The invention relates to a dual-phase sampling front-end amplifier circuit of a gyroscope and a signal control principle thereof. Background technique [0002] High-precision gyroscopes and accelerometers are favored for their wide-ranging applications in precision navigation, automotive electronics, intelligent robotics, industrial control, and consumer electronics. The MEMS gyroscope can be equivalent to a pair of dynamic differentially changing capacitors. The capacitance change can reflect the change of the physical quantity to be measured. The capacitance change is generally 10 -18 ~10 -12 F, put forward more stringent requirements on the sensitivity, resolution and linear range of the capacitive readout circuit. The middle plate of the existing gyroscope must be grounded. However, one end of the front-end capacitance-voltage conversion module of the existing gyroscope readout circuit is connected to the power supply V dd , the other end is gro...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the aforementioned defects, and designs a gyroscope dual-phase sampling front-end amplifier to solve the problem that the middle plate of the front-end amplifier of the existing gyroscope sensor model circuit cannot be directly connected to the field

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