A 0.021mm2 92dB-SNDR 88kHz-BW Incremental Zoom ADC with 2nd-order RT-DEM and Quiet Chopping

This work proposes a continuous-time incremental zoom ADC with an on-chip $2^{\mathrm{n}\mathrm{d}}$-order decimation filter. It adopts a $2^{\mathrm{n}\mathrm{d}}$-order RT-DEM technique to eliminate DAC mismatch with a customized bidirectional circular shift register, and the quiet chopping technique to achieve high input impedance. The prototype ADC presents 91.6dB SNDR over an 88kHz bandwidth, consuming only $437\mu \mathrm{W}$ of power.