Uniqueness of Circuits and Systems Containing One Nonlinearity
S. Boyd and L. O. Chua
IEEE Transactions on Automatic Control, TAC-30(7):674-681, July 1985.
We study systems containing one memoryless nonlinearity. We show that two such systems have the same I/O operator only when they are related by simple scaling, delay, and loop transformations. The theory is applied to one-port networks containing one nonlinear element.