Abstract
A multi-bit sigma-delta modulator with interstage feedback is described. The structure employs a single-bit quantizer in the main sigma-delta modulator and a multi-bit quantizer in the feed-forward path with its error fed back to the main modulator. It combines the advantages of sigma-delta modulator and pipeline A/D converters. This system topology offers an additional noise shaping factor to the error of the multi-bit quantizer.
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