A consistent nonlinear simulation environment based on improvedharmonic balance techniques

摘要

Nonlinear simulations of semiconductor networks, in both the timenand the frequency domains, determine the accuracy of analog CAD tools.nConventional circuit simulators such as SPICE provide nonlinearnsimulation only in the time domain. Analysis outputs are often verifiednby the frequency-domain nonlinear harmonic balance (HB) techniques.nHowever, inconsistency between the individually developed tools wouldneasily invalidate this simulation/verification process. In addition, thenHB algorithms also suffer from many convergence problems which excludenHB from general applications. The authors present a compiler-basedndesign framework in association with the improved HB algorithms tonprovide consistent nonlinear simulations. Simulation algorithms arenformulated directly on unified modeling primitives which are then usednto construct device models. Application examples and simulation resultsnare presented to demonstrate the effectiveness of the proposednmethodology