Time-interleaved sigma-delta modulator using output prediction scheme

Abstract—A time-interleaved sigma–delta modulator using the output prediction scheme is proposed. This approach uses only one integrator channel along with incomplete integrator output terms to eliminate the quantizer domino which is a key limit for practical circuit implementation of conventional time-inter-leaved sigma–delta modulators. In addition, channel mismatch effects due to mismatch within multiple integrator feedback paths can be reduced by optimizing the feedback path. An equiva-lent two-channel time-interleaved version of the conventional second-order sigma–delta modulator is realized to verify the proposed method. Index Terms—Channel mismatch, incomplete integrator outputs, output prediction, quantizer domino, sigma–delta modu-lators, time-interleaved. I