The Liberty Format is an open source industry standard for library modeling that has seen significant enhancement in recent years to address the challenges introduced by the new smaller technologies at 65nm and below. Issues associated with modeling Timing, Power and Noise have seen an explosion in complexity. The paper discusses the challenges introduced by the new high accuracy models and techniques to ameliorate them for Library providers.

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This paper presents a switched capacitor circuit simulator, AWEswit. 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 Pad6 sequence is employed to extract dominant pole models for the response of the state variables. In addition a general technique to handle complications in the AWE analysis resulting from loops of voltage sources and capacitors is presented. This technique makes AWEswit compatible with that class of switched capacitor simulators which operate in the charge-voltage regime.