Offset elimination in ΣΔ analog to digital converters by ƒs/2 modulation

This paper derives ƒs/2 modulation from signal and system theory of complex signals. It is presented, how the In phase and the Quadrature phase are reduced to a single phase, while all properties of complex signaling are maintained. Further, it is derived, that the remaining phase is predestinated for ΣΔ modulation. Finally, simulation results prove the theoretically derived offset-elimination property.

[1]  R. Mina,et al.  Advanced `Fs/2' Discrete-Time GSM Receiver in 90-nm CMOS , 2006, 2006 IEEE Asian Solid-State Circuits Conference.

[2]  Chung-Yu Wu,et al.  Chopper-stabilized sigma-delta modulator , 1993, 1993 IEEE International Symposium on Circuits and Systems.

[3]  Colin Lyden,et al.  A high pass switched capacitor ΣΔ modulator , 2002, ICECS.

[4]  Gabor C. Temes,et al.  Circuit techniques for reducing the effects of op-amp imperfections: autozeroing, correlated double sampling, and chopper stabilization , 1996, Proc. IEEE.

[5]  C. Lyden,et al.  A high pass switched capacitor /spl Sigma//spl Delta/ modulator , 2002, 9th International Conference on Electronics, Circuits and Systems.

[6]  Jean-François Naviner,et al.  High-pass /spl Delta//spl Sigma/ modulator: from system analysis to circuit design , 2006, 2006 IEEE International Symposium on Circuits and Systems.

[7]  Gabor C. Temes,et al.  Understanding Delta-Sigma Data Converters , 2004 .

[8]  Koichi Ishida,et al.  Chopper-stabilized high-pass sigma delta modulator utilizing a resonator structure , 2003, IEEE Trans. Circuits Syst. II Express Briefs.