RAMP INPUT RESPONSE OF RC TREE NETWORKS

Closed form expressions are presented to accurately describe the delay characteristics of RC tree networks. The Penfield-Rubinstein-Horowitz approach to estimating the step function response of RC trees has bee n extended to consider ramp inputs. This result improves timing accura cy by considering the shape of the input waveform driving each individ ual interconnect tree while maintaining computational simplicity for u se in the automated timing analysis of complex VLSI circuits.