An Accurate Time-Domain Current Waveform Simulator for VLSI Circuits

A new charge-based current model for CMOS gates is presented in this paper. The current during a transition consists of three components : one occurs when the input changes and the others ezist only when the output changes. So, this model can generate current waveform with negative values, like SPICE. These three components are characterized b y triangular functions with four parameters which can be easily obtained after timing simulation. When comparing the resulta obtained b y wing SPICE with those b y our model, we find agreement, especially on the time points at which mazimum current occurs.