SINGLE AMPLIFER BI-QUAD SIGMA-DELTA MODULATOR

摘要

Some embodiments include apparatus and methods using a first stage including an integrator, a second stage coupled to the first stage, the second stage including an amplifier, a first capacitor, and a second capacitor coupled in series with the first capacitor between an input node and an output node of the amplifier, a quantizer coupled to the output node of the amplifier, and a feedback path coupled to an output node of the quantizer and to the first and second stages, the feedback path including a digital-to-analog converter (DAC), the DAC including an input node coupled to the output node of the quantizer and an output node coupled to the input node of the amplifier.