Patent ID: 8302046

Claim:
A system for analysis of an integrated circuit design, the system comprising: a processor to execute instructions to perform operations in analyzing timing of an integrated circuit design; and a processor readable storage device to store instructions that when executed by the processor cause the processor to perform operations including modeling a logic gate with a constant direct current (DC) voltage source during a steady state region of operation; in response to a transition from the steady state region of operation, modeling the logic gate with a time-varying voltage dependent current source during a varying current region of operation, wherein an instantaneous output current provided by the time varying voltage dependent current source is responsive to time and an instantaneous output voltage of the logic gate; and in response to a transition from the variable current region of operation, modeling the logic gate with a time-invariant voltage dependent current source during an asymptotic region of operation, wherein an instantaneous output current provided by the time-invariant voltage dependent current source is responsive to instantaneous output voltage of the logic gate independent of time.