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High frequency circuit simulation involving nonlinear active devices presents special simulation challenges because of the complex distributed linear environments involved, and the increasing need to accommodate wide-spectrum digitally-modulated signal formats operating over very large bandwidths. This contribution describes a simulation approach that is based on discrete-time convolution which allows both transient and steady-state solutions to be obtained with high accuracy, generality and robustness. Examples are given of the application of this kind of simulation to severely nonlinear operation of a high frequency power amplifier employing lumped elements with lossy, dispersive transmission lines. The approach described is also of interest for signal integrity simulations in high speed digital systems.
Date of Conference: 27-30 May 2007