Low‐Noise MEMS Microphone Readout Integrated Circuit Using Positive Feedback Signal Amplification
ETRI Journal(2016)
摘要
A low‐noise readout integrated circuit (ROIC) for a microelectromechanical systems
(MEMS) microphone is presented in this paper. A positive feedback signal amplification
technique is applied at the front‐end of the ROIC to minimize the effect of the output
buffer noise. A feedback scheme in the source follower prevents degradation of the
noise performance caused by both the noise of the input reference current and the
noise of the power supply. A voltage booster adopts noise filters to cut out the noise
of the sensor bias voltage. The prototype ROIC achieves an input referred noise (A‐weighted)
of −114.2 dBV over an audio bandwidth of 20 Hz to 20 kHz with a 136 μA current consumption.
The chip is occupied with an active area of 0.35 mm
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关键词
Microelectromechanical systems,microphone,capacitive microphone,positive feedback signal amplification,source follower,voltage booster,MEMS
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