Time-Interleaved Noise-Coupling Delta-Sigma Modulator Using Modified Noise-Shaped Integrating Quantizer

This paper presents an efficient noise coupling scheme in time-interleaved delta-sigma modulators (DSMs). The traditional voltage domain quantization error extraction is replaced with time domain method which is inherently available in the noise-shaped integrating quantizers (NSIQs). Thus, no digital-to-analog converter is required for the noise-coupling. A modified NSIQ scheme is proposed, which not only allows the use of the NSIQ with an even number of time-interleaving, but also increases the overall noise transfer function (NTF) order. Along with an additional order of NTF in the NSIQ, a higher order NTF can be achieved by interleaving and noise-coupling multiple channel NSIQs and DSMs. The proposed time-interleaved noise-coupling NSIQ can be used as a stand alone analog-to-digital converter, or as a quantizer in time-interleaved DSMs. Mathematical analysis and MATLAB simulation results are provided to prove the efficiency of the proposed scheme.