A high-resolution time-interleaved delta-sigma modulator with low oversampling

This paper proposes a new two-channel time-interleaved delta-sigma modulator (DSM). The time-interleaved approach can reduce four times of sampling rate as compared with the conventional delta-sigma modulator and the performance is much better. This technique can relax the limitation of high-gain and high-speed requirements of opamps in the DSM design and thus it can reduce the design complexity and power consumption significantly. Consequently, this proposed DSM architecture can provide a low power and high-resolution performance for the audio band applications. The simulation results indicate that this interleaved DSM has a dynamic range of 110dB with 3.2 MHz sampling rate in 25 kHz signal bandwidth.

[1]  A. Eshraghi,et al.  A time-interleaved parallel /spl Delta//spl Sigma/ A/D converter , 2003 .

[2]  Gabor C. Temes,et al.  A Noise-Coupled Time-Interleaved Delta-Sigma ADC With 4.2 MHz Bandwidth, ${-}$ 98 dB THD, and 79 dB SNDR , 2008, IEEE Journal of Solid-State Circuits.

[3]  Gabor C. Temes,et al.  Noise-Coupled Multi-Cell Delta-Sigma ADCs , 2007, 2007 IEEE International Symposium on Circuits and Systems.

[4]  Gabor C. Temes,et al.  Enhanced split-architecture delta-sigma ADC , 2006, 2006 13th IEEE International Conference on Electronics, Circuits and Systems.

[5]  David A. Johns,et al.  Time-interleaved oversampling A/D converters: theory and practice , 1997 .

[6]  Sudhakar Pamarti.  The Effect of Noise Cross-Coupling on Time-Interleaved Delta-Sigma ADCs , 2008, IEEE Transactions on Circuits and Systems II: Express Briefs.