Hybrid time-stamped transition density for the estimation of delay-dependent switching activities

We propose a new method to estimate the delay-dependent switching activities of the combinational circuits. The method extends the transition density in order to handle the delay dependent properties of glitches; each transition density is tagged with its time stamp. It also combines the accurate power estimation of the symbolic simulation under the zero-delay model and the efficient glitch power estimation of the time-stamped transition density method. The experimental results show that our proposed method estimates the delay-dependent switching activities within about 10% error on the average.