Patent ID: 6278750
Filing Date: 2001-08-21
Classification: H03M

Abstract:
An automatic gain control (AGC) feedback-referenced sigma-delta modulating device provided for processing an analog signal therein comprising:an automatic gain controller (AGC) includes a peak detector for receiving and determining a peak input voltage of said analog input signal;said automatic gain controller further includes a maximum gain control block for receiving said peak input voltage from said peak value detector for generating a maximum gain controlled peak value Vp;said automatic gain controller further includes a positive-and-negative AGC reference voltage (Vref.sup.+AGC, Vref.sup.-AGC) generation block for receiving and applying said maximum gain controlled peak value Vp to generate a positive AGC reference voltage Vref.sup.+AGC and a negative AGC reference voltage Vref.sup.-AGC; anda sigma-delta modulator includes a switched capacitor integrator for receiving said analog input signal and an AGC feedback of said positive AGC reference voltage Vref.sup.+AGC and said negative AGC reference voltage Vref.sup.-AGC for processing said analog input signal and said AGC feedback of said positive AGC reference voltage Vref.sup.+AGC and said negative AGC reference voltage Vref.sup.-AGC for generating a one binary bit output therefrom.