Extended Noise shaping of Cross-Coupled Sigma-Delta Modulator using optimized coefficients

In this paper, combined time-interleaving and noise coupling is used to achieve considerable improvement in the performance of sigma-delta modulator. A lowpass ∆Σ modulator with two time-interleaved first-order modulatore by used zero-optimization scheme for cross-coupled paths is described. The proposed technique enhances the level of the signal-to quantization-noise-ratio (SQNR) by optimizing the zero location of the noise transfer function (NTF), which leads to an increase in signal to noise. In the new SQNR design, the modulator rises up to 8.5 db.