Patent ID: 8086976

Claim:
A method for statistical slew propagation in static statistical timing analysis, the method comprising: projecting a canonical approximation of an input slew to a first corner by using a computer; using the projected canonical approximation of the input slew to calculate a first delay and a first output slew; projecting the canonical approximation of the input slew to a second corner; perturbing the input slew to the second corner; calculating a second delay and a second output slew at the second corner using the input slew perturbed to the second corner; determining a delay sensitivity to the input slew and an output slew sensitivity to the input slew using finite difference calculations between the first delay and the first output slew at the first corner and the second delay and the second output slew at the second corner; identifying a set of parameters to which the input slew is sensitive, but to which at least one of the first and second delays or the first and second output slews are not sensitive; and modeling pure second order contributions of the parameters in the set on the at least one of the first and second delays or the first and second output slews.