Noise analysis of ideal switched-capacitor networks

This paper presents a method for computing the noise power spectral density (PSD) in switched-capacitor networks, Explicit formulas are developed for both white and 1/f noise sources. The 1/f noise is handled directly in the formulation without having to approximate its PSD by using a noise shaping filter. The technique eliminates the need for computing eigenvalues or matrix exponentials as well as solving bilateral matrix equations, and thereby leads to a numerically efficient algorithm. The noise sources considered here are the ON-resistances of MOS switches and the input referred noise PSD's of operational amplifiers (opamps). Experiments are carried out to demonstrate the validity of the formulation for both white and 1/f input noise.