Method for incorporating noise considerations in automatic circu

Details Method for incorporating noise considerations in automatic circu Method for incorporating noise considerations in automatic circu

1998-04-07

1999-12-07

Teska, Kevin J.

39550035, G06F 9455

Patent

active

059997141

ABSTRACT:
A method of incorporating noise considerations during circuit optimization includes the steps of: specifying a circuit schematic to be optimized; specifying at least one noise criterion as a noise measurement, including the signal to be checked for noise, the sub-interval of time of interest, and the maximum allowable noise deviation; providing each noise criterion as either a semi-infinite constraint or a semi-infinite objective function; specifying at least one variable of the optimization; converting the semi-infinite noise constraints and the semi-infinite noise objective functions into time-integral equality constraints; optionally, if required, providing additional optimization criteria other than noise as, for each such criterion, either objective functions or constraints; creating a merit function to be minimized to solve the optimization problem; simulating the circuit in the time-domain; computing the values of the objective functions and constraints; efficiently computing the gradients of the merit function of the optimizer (including contributions of all objective functions and constraints and the time-integrals representing noise considerations) preferably by means of a single adjoint analysis; iteratively providing the constraint values, the objective function values and the gradients of the merit function to a nonlinear optimizer; and continuing the optimization iterations to convergence.

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T. Nguyen et al., "Adjoint Transient Sensitivity Computation in Piecewise Linear Simulation", Proceedings of Design Automation Conference, 1998, pp. 447-482.

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