Hannu Jokinen

An approximate analysis method of nonideal switched capacitor circuits is introduced. The method solves the time domain presentation in steady state as well as the frequency response for nonideal circuits. Circuits may be composed of all kinds of linear components and nonlinear transistor model can be used for the switches. An example is given to demonstrate that the proposed method

ABSTRACT This paper presents a steady-state small-signal analysis method for nonlinear circuits. The method can be used to calculate the steady-state time domain representation as well as the frequency response of switched-capacitor circuits. Any nonideal models for switches can be used, i.e., all modeling levels of MOSFETs as switches including parasitic components can be simulated. The method proposed may be applied to mixer analysis for the case of a strong LO and a weak RF signal to calculate the steady-state solution, the spectrum, or the conversion gain. An example is given to demonstrate that the method proposed is efficient and sufficiently fast to simulate switched-capacitor circuits. The simulation results show good agreement with transient analysis