Patent ID: 7552040
Filing Date: 2009-06-23
Classification: G06F

Abstract:
1. A method for determining coefficients for a logical circuit block model, comprising: determining a value of a simulated gate current conducted from a logical circuit block output into a gate of a loading circuit transistor during simulations of performance of said logical circuit block; simulating a current-dependent current source conducted from said logical circuit block output to a return path during said simulations of performance; setting a magnitude of the current-dependent current source to a value computed according to a model from the determined value of the simulated gate current, wherein the magnitude of the current-dependent current source is set in proportion to the determined value of the simulated gate current according to a proportion; repeatedly calculating a logical circuit block performance value while varying the proportion in order to simulate different sizes of the loading circuit transistor; computing said coefficients from a result of the calculating, wherein the coefficients are coefficients that relate the logical circuit block performance value to a capacitance of said gate of said loading circuit transistor from a result of said calculating and said varying; and storing said coefficients in a computer memory.