Quartz Flexible Accelerometer (QFA) system has gained extensive utilization in related navigation system due to the high precision, exceptional stability, and rapid response. The operational amplifier as the pivotal component of the analog servo circuit intricately relative to the performance of the QFA system. In this paper, the electrical mechanism of the QFA readout system and the influence of operational amplifier noise on the noise of QFA readout system is studied, a low-noise Class AB amplifier for the servo circuit of QFA readout system designed and fabricated by 180 nm BCD process, and the QFA readout system with the designed amplifier is simulated. The experimental results show that the low-noise amplifier achieved equivalent input current and voltage noise of 5.75pA/sqrt (Hz) and 12.7nV/sqrt (Hz) separately. Simulation results shows the designed QFA servo circuit has achieved resolution of 35 μ g and noise of 2.1 μ g/sqrt (Hz) @1Hz.
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Li et al. (2024) studied this question.
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