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A technique to improve power scaling efficiency of MEMS interfaces over previous approaches is presented. Power scaling with respect to amplitude is achieved by cascading gain stages through an input gain-select mux, and power scaling with respect to input bandwidth of the sensor is achieved through periodic power-down of the interface. A prototype of the interface was fabricated in 1.8V , 0.18 mum...
A 12 bit 50 MSPS pipelined ADC is fabricated in 0.18 mum CMOS process. Internal reference buffers without off-chip capacitors are implemented under 1.8 V power supply voltage for 2 Vp-p input signal swing. Opamp sharing and removal of explicit S/H stage are utilized for low power dissipation. Occupying 1.81times0.76 mm2, ADC achieves SNR of 70.4 dBFS, SFDR of 86 dBFS and ENOB of 11.3 b at Fin of 10...
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