Patent ID: 6850877

Claim:
A method of modeling the performance of an electronic circuit, comprising the steps of: retrieving, from a memory, model parameters of the circuit; retrieving, from a memory, manufacturing process parameters corresponding to a manufacturing process by way of which the circuit may be fabricated; operating a computer to derive a Jacobian matrix corresponding to the dependence of a plurality of circuit performances in response to variations in values of the process parameters; operating the computer to perform singular value decomposition of the Jacobian matrix to provide an ordered set of singular values and a rotation vector; selecting a subset of the ordered set of singular values, the subset including those singular values of significant magnitude; for each of the plurality of circuit performances, deriving a worst case vector of process parameters from the selected subset of singular values and the rotation vector; and operating the computer to simulate the operation of the circuit for each of the worst case vectors of process parameters, to evaluate worst case modeled values for each of the plurality of circuit performances.