TOWARD THE 24-BIT DAC - NOVEL NOISE-SHAPING TOPOLOGIES INCORPORATING CORRECTION FOR THE NONLINEARITY IN A PWM OUTPUT STAGE

Possible means are discussed to achieve a DAC with performance close t o 24 bit, focusing on an oversampled pulse-width-modulation (PWM) desi gn. It is explained that, at this level of performance, correction for the intrinsic PWM nonlinearity must be integrated with the noise shap ing. A design is presented for a suitable nonlinear noise shaper with a theoretical performance in the region of 26 bit.