Abstract
This paper presents an opamp-free solution to implement noise shaping in a successive approximation register analog-to-digital convertor. The comparator noise, incomplete settling error of digital-to-analog convertor and mismatch are alleviated. Designed in a 65 nm CMOS technology, the prototype realizes 58 dB SNDR at 50 MS/s sampling frequency. It consumes 120.7 μW from a 0.8 V supply and achieves a FoM of 14.8 fJ per conversion step.
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