A higher-order mismatch-shaping method for multi-bit Sigma-Delta Modulators

Mismatch-shaping dynamic element matching (DEM) methods are extensively used in multi-bit sigma-delta modulators (SDM) to reduce the effects of element mismatches. To date, only first and second-order mismatch-shaping DEM techniques have been reported in the literature. In this paper, a higher-order mismatch-shaping DEM method is reported, which is an extension of the known vector-feedback mismatch-shaping technique. Example simulation results are presented for third-order and fourth-order mismatch-shaping DEMs.