A 372 µW 10 kHz-BW 1092 dB-SNDR Nested Delta-Sigma Modulator Using Hysteresis-Co

Abstract

This article presents a nested delta-sigma modulator (DSM) structure, where an inner analog DSM is embedded in an outer analog-digital-hybrid DSM. The outer hybrid DSM is com- posed of the inner analog DSM, a digital filter, and a hysteresis- comparison MSB-pass quantizer. The internal signal swing of the inner analog DSM can be significantly suppressed by the outer DSM loop, thus achieving good power efficiency. Compared to conventional system-level signal swing optimization techniques, the pro