A new single-loop single-stage low power sigma-delta modulator

摘要

This paper presents a new single-loop single-stage second order sigma-delta modulator. The circuit based on switched capacitor components just uses one Op-Amp to realize second order noise shaping. The modulator demonstrated 85 dB DR in 8kHz bandwidth, dissipating 135 /spl mu/W from a 2.5 V supply.