Abstract.
The formalized approach for periodic distortion analysis is presented. The
problem of distortion of periodic time-varying circuits is an important
practical task in development of RF CAD. Distortion analysis of communication
circuits often requires determining the distortion about a periodically
time-varying operating point. In this case the distortion characteristics can be
obtained from the simulation of weakly nonlinear behavior with respect to the
input signal. The computational method is based on exploitation of the
properties of the simplified Newton iterative process to solve nonlinear
problems in functional space. The numerical scheme of periodic distortion
analysis is described. Unlike Volterra series this technique doesn’t require
computation of the second and third derivatives of device models. Three steps of
the algorithm provide the same order of accuracy that three steps of the
distortion procedure based on Volterra series methods. The special-purpose mode
for the periodic distortion analysis of RF circuits is based on the simulation
in the frequency domain in the framework of the harmonic balance method. In
comparison with solving the complete multitone steady-state problem for the
periodic distortion analysis the new approach provides the significant
computational efficiency due to the simplification of the algorithms.
Key words: circuit
simulation, nonlinear circuits, steady-state periodic mode, periodic distortion.
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