A Discrete-Time Audio ΔΣ Modulator Using Dynamic Amplifier With Speed Enhancemen

Abstract

This article presents a discrete-time second- order  modulator for the audio applications. In this modulator, a novel dynamic amplifier is proposed to realize the switched-capacitor (SC) integrators. To eliminate the common-mode (CM) voltage drop in a closed-loop dynamic amplifier during the integration phase, without the use of additional load capacitance, the reset method for the amplifier is modified. Two auxiliary branches are introduced to enhance the settling speed of the integrator. Two dif