Expandible high-order cascade ya modulator with constant, reduced systematic loss of resolution

Abstract

A-t - An arbitrary order sigma-delta modulator cascude architecture is presented with only I-bit loss of resolution due to scaling issues, even with single-bit quantizulion. This loss is kept with a high overloading point, regardless of the order. Simulations reveol that circuit imperfections can be tolerated up to 6th order, so that 90-dB SNDR can be obtained with x16 oversampling, without multi-bit quantization.