Suppression of Low-Frequency Noise Using Discrete Component Chopping Noise Suppression Circuit for Space Inertial Sensor Drive Voltage Amplifier

Abstract The space inertial sensor represents a pivotal component of the space gravitational wave detection apparatus, whereas the test mass (TM) it contains serves as a pivotal reference for space gravitational wave detection. The actuation circuit maintains the test mass at a fixed position within the space inertia sensor. The Drive Voltage
Amplifier (DVA) of the actuation circuit introduces low-frequency noise that directly affects the accuracy of gravitational wave detection at the mHz frequency. Therefore, it is of great significance to suppress low-frequency noise in the DVA. This study analyzes the noise modelling of the DVA in the actuation circuit and points out that the low-frequency noise of the DVA is mainly 1/f noise. Based on chopping noise suppression technology, a set of chopping noise suppression circuits is designed to greatly suppress the background noise of the DVA under the premise of ensuring the functionality of the circuit. At last, a printed circuit board (PCB) prototype was constructed for experimental analysis, reducing the noise floor at 1 mHz from 22.89 uV/√Hz to 1.24 uV/√Hz, and reducing the noise at 1 mHz of the output signal from