AWEswit: A switched capacitor circuit simulator

A switched capacitor circuit simulator, AWEswit, is presented. AWEswit exploits the cyclical reconfiguration of switched capacitor circuits through a sequence of continuous-time circuits. It employs asymptotic waveform evaluation (AWE) to estimate the response of the state variables (capacitor voltages) in each switching phase. For accuracy, a horizontal Pade´ sequence is employed to extract dominant pole models for the response of the state variables. In addition, a general technique for handling complications in the AWE analysis resulting from loops of voltage sources and capacitors is presented. This technique makes AWEswit compatible with the class of switched capacitor simulators that operate in the charge-voltage regime. Simulation results are presented