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- W2016305909 abstract "A multi-function two-stage chopper-stabilized preamplifier (PAMP) for MEMS capacitive microphones (MCM) is presented. The PAMP integrates digitally controllable gain, high-pass filtering and offset control, adding flexibility to the front-end readout of MCMs. The first stage of the PAMP consists of a source-follower (SF) while the second-stage is a capacitive gain stage. The second-stage employs chopper-stabilization (CHS), while SF buffer shields the MCM sensor from the switching spurs. The PAMP uses MW poly bias resistors for the second-stage, exploiting Miller effect to achieve flat audio-band response. The gain and high-pass filtering corner can be adjusted by digitally controlling the capacitor banks in the PAMP. The offset-control feature of the PAMP is implemented using a narrow-band low-pass gm-C filter. The PAMP occupies 950 mum times 950 mum in 0.35 mum CMOS technology and draws a 50 muA total current from a 1.8 V single supply. The PAMP achieves SNDR of 44 dBA/Pa (elec. meas.) and 27 dBA/Pa (acoustic meas.) and a conversion range from 50 dBSPL to 120 dBSPL." @default.
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- W2016305909 date "2009-09-01" @default.
- W2016305909 modified "2023-10-02" @default.
- W2016305909 title "A multifunction low-power preamplifier for MEMS capacitive microphones" @default.
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- W2016305909 doi "https://doi.org/10.1109/esscirc.2009.5325947" @default.
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