Fully integrated architecture for improved sigma-delta modulator with automatic gain controller

Abstract

The present invention discloses an automatic gain control (AGC) feedback-referenced sigma-delta modulating device provided for processing an analog signal received therein. This device includes an automatic gain controller (AGC) for receiving processing the analog input signal for generating an AGC feedback including a set of positive and negative AGC reference voltages. This device further include a sigma-delta modulator for receiving the analog input signal and the AGC feedback of the set of the positive and negative AGC reference voltages for generating a one binary bit output therefrom. In a preferred embodiment, the automatic gain controller (AGC) includes a peak detector for receiving and detecting a peak input voltage of the analog input signal. The automatic gain controller (AGC) further includes a maximum gain control block for receiving the peak input voltage from the peak value detector for generating a maximum gain controlled peak value Vp. And, the automatic gain controller (AGC) further includes a positive-and-negative AGC reference voltage (Vref+_AGC, Vref−_AGC) generation block for receiving and applying the maximum gain controlled peak value Vp to generate a positive AGC reference voltage Vref+_AGC and a negative AGC reference voltage Vref−_AGC.

Dependencies are inferred from the claim text.