Harmonic analysis for nonlinear characteristics

Harmonic analysis may be carried out for nonlinear devices by the use of a set of polynomial functions applied directly to the nonlinear characteristic instead of by the more conventional use of trigonometric functions. Higher accuracy may sometimes be achieved in point-by-point calculations. A special method of representation shows how the form of the nonlinear characteristic affects its response. A method is presented for using measurements of amplitudes to obtain analytical expressions for the nonlinear function.