A Stable 4th-Order Delta-Sigma Modulator with an FIR predictor

Abstract

AbstrwtA novel approach for a stable high-order delta-sigma modulator is presented. The modulator provides 16 bit resolution at 20kHz bandwidth using 4th~order noise shaping structure at an oversampling ratio of 64. The modulation loop is completely stabilized by an FIR prediction technique. The architecture inherently has less sensitivity to com¬ ponent mismatch. The total hardware is much the same as the noise shaping integrators.