1. [1] S.R. Norsworthy, R. Schreier, and G.C. Temes, Delta-Sigma Data Converters: Theory, Design, and Simulation, Piscataway, NJ: IEEE Press, 1997.
2. [2] J.M.D.L. Rosa and R.D. Rio, Introduction to ΣΔ Modulators: Basic Concepts and Fundamentals, CMOS Sigma-Delta Converters: Practical Design Guide, John Wiley & Sons, 2013.
3. [3] A.A. Hamoui and K.W. Martin, “High-order multibit modulators and pseudo data-weighted-averaging in low-oversampling ΔΣ ADCs for broad-band applications,” IEEE Trans. Circuits Syst. I, vol.51, no.1, pp.72-85, Jan. 2004. 10.1109/tcsi.2003.821291
4. [4] G. Fahmy, D. Kanemoto, H. Kanaya, K. Yoshida, R. Pokhard, and A. Anand, “A third order delta-sigma modulator employing shared opamp technique for WCDMA on 0.18um CMOS,” IEICE Electron. Express, vol.8, no.15, pp.1204-1209, 2011. 10.1587/elex.8.1204
5. [5] G.-M. Sung, C.-P. Yu, and D.-A. Yao, “A comparison of second-order sigma-delta modulator between switched-capacitor and switched-current techniques,” IEEE Asia Pacific Conference on Circuits and Systems, B7P-K1, pp.1172-1175, 2008. 10.1109/apccas.2008.4746234