Two numerical methods for distortion analysis of transistorized networks are compared. One, based on Volterra series expansions, is generally accepted as being useful for small signals and mildly nonlinear systems. The other is a new piecewise harmonic balance technique which works for small as well as large signals. For very small signals, both methods give identical results. If the signals are moderately large or the system moderately nonlinear, the Volterra series method gives erratic and incorrect results and breaks down completely for large signals.

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Journal IEEE Transactions on Circuits and Systems
Gopal, K. (Krishna), Nakhla, M.S, Singhal, K. (Kishore), & Vlach, J. (Jiri). (1978). Distortion Analysis of Transistor Networks. IEEE Transactions on Circuits and Systems, 25(2), 99–106. doi:10.1109/TCS.1978.1084445