Multi band sigma delta analog to digital conversion

Abstract

A multi band approach to oversampled noise shaping analog to digital conversion is described. The multi band A/D converter breaks the signal band into several smaller bands and uses a different band reject noise shaping transfer function for each band. A FIR filter bank attenuates the out-of-band noise for each band and reconstructs the signal. This approach allows performance improvements over conventional noise shaping A/D converters which convert the entire signal band using one noise shaping transfer function. A design example and simulation results where a signal with 512 kHz bandwidth is converted to about 16 bits of resolution is presented.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>