Agilent Technologies, Inc.

Cadence Design Systems, Inc.

Richard Trihy

Donald John O'Riordan

Ronald Alan Rohrer

The response of linear and non-linear systems to an arbitrary pulse train is modeled for efficient and accurate circuit simulation. First, a harmonic balance analysis is performed for a system incorporating linear and non-linear components. Then, the even and odd frequency components of the harmonic balance result are separated and interpolated. Finally, the resulting interpolated components are combined to generate the frequency domain positive step response and the frequency domain negative step response of the system. These resulting frequency domain step responses are utilized to generate a low order pole/zero model of the step responses. The pole/zero model can then be used to efficiently and accurately model the response of the system to an arbitrary sequence of positive and negative going pulses.

Modeling linear and non-linear system response to a pulse train

An improved method for debugging of analog and mixed signal behavioral models during simulation using Newton-Raphson iteration replay. The method according to the invention has substantially modified the prior art solution by limiting the interactive debugging steps in a replay of the last iteration of the accepted timepoints. Using this method, the user only interacts with the simulation during the iteration replay, and only for the accepted solution points. If the user is single stepping through this simulation, the simulator enters interactive mode at each statement during the replay. Similarly, if not single stepping, but a breakpoint has been triggered, the simulator enters the interactive mode at the appropriate statement to honor the breakpoint. While the iteration replay is performed, the system of equations does not need to be solved again. Instead, the solution vector is reinstated from the known solution of the last iteration.

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Richard Trihy