Sensitivity Computation in Piecewise Approximate Circuit Simulation

Download or read book Sensitivity Computation in Piecewise Approximate Circuit Simulation written by Carnegie-Mellon University. SRC-CMU Research Center for Computer-Aided Design and published by . This book was released on 1989 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Both direct and adjoint methods are applied to the computation of time-domain transient sensitivities in the already efficient SPECS piecewise approximate circuit simulation environment. By exploiting the event-driven nature of SPECS, the computation, storage and interpolation of the Jacobians is not required to obtain sensitivities. Both direct and adjoint methods require only a marginal computational overhead and provide equivalent results. The choice of the method to employ depends on the ratio of the number of outputs to the number of parameters. More parameters favor the adjoint method and more outputs favor the direct. The overall efficiency of both SPECS and its time-domain sensitivity extension allows it to be applied to realistic circuits that due to their large size had previously made such analysis impractical. Simulation results on industrial circuits of up to 1500 MOS transistors show that transient sensitivities can be efficiently computed for large circuits.