Prediction of the spectrum of a digital delta-sigma modulator followed by a polynomial nonlinearity
IEEE Transactions on Circuits and Systems Part I: Regular Papers
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Dithering inside the loop of sigma-delta and multistage sigma-delta modulators is studied. It is shown under certain conditions that dithering inside the loop of the sigma-delta modulator has the effect of attenuating the discrete quantization error spikes. It does not make the quantization error white. For a multistage sigma-delta modulation system, inside-the-loop dithering makes the quantization error white for a system with three stages. Simulation results are presented to support the theoretical analysis.