The Frequency Domain Behavioral Modeling and Simulation of Nonlinear Analog
Circuits and Systems.
A new technique for the frequency--domain behavioral modeling and simulation of
nonautonomous nonlinear analog subsystems is presented. This technique extracts
values of the Volterra nonlinear transfer functions and stores these values in binary files.
Using these files, the modeled substem can be simulated for an arbitrary
periodic input expressed as a finite sum of sines and cosines. Furthermore,
the extraction can be based on any circuit simulator that is capable of steady
state simulation. Thus a large system can be divided into smaller subsystems,
each of which is characterized by circuit level simulations or lab measurements.
The total system can then be simulated using the subsystem characterization
stored as tables in binary files.
Usng known ideal nonlinear circuits, the method extraction technique was tested
for nonlinearities up to seventh order. The Volterra nonlinear transfer
functions of an equalizing circuit were extracted from the results of transient
simulations which utilized the shooting method. The resulting tables were then
used to simulate an arbitrary waveform and the results closely matched the
equivalent time domain circuit simulation.
Philip J. Lunsford, II (Under the direction of Michael B.~Steer.)