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A fully-differential open-loop switched capacitor interface is presented in this paper for a ±30 g capacitive micro-accelerometer. Considering that input common-mode feedback capacitors in a fully-differential charge sensitive amplifier increase the gain of noise, a full-swing input common-mode feedback scheme is proposed in this work to minimize the feedback capacitance and reduce the noise. Moreover,...
A low-noise high-linearity switched capacitor interface implemented in a 0.35$\mu \text {m}$ 3.3 V/15 V CMOS process is presented in this paper for a ±50g capacitive micro-accelerometer. The sensing element is enclosed in an optimized closed loop with proportional-integral compensation, improving the linearity significantly. In order to suppress the flicker noise of the front-end at the lowest cost,...
A switched capacitor interface is presented in this paper for a ±50g capacitive micro-accelerometer. In order to suppress the flicker noise of the frontend, a switched capacitor proportional-integral controller combined with a charge sensitive amplifier using correlated double sampling is proposed. The controller has a simple structure with minimized number of switches and cancels the offset of both...
This paper presents a low-noise single-ended open-loop switched-capacitor interface circuit in 0.35μm CMOS technology for a comb structure micro-accelerometer. Using correlated double sampling, the low-frequency noise of the charge sensitive amplifier and the gain stage is suppressed, whereas the noise of the sensor charging reference voltage and the sample-and-hold circuit which follows the gain...
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