Patent ID: 8081928

Claim:
A method of canceling unwanted harmonic signal component Sh 1 at a frequency Fsh that is a selected harmonic of an operating frequency Fo of a signal Sc, the method comprising: a) conducting the signal Sc via an integrated semiconductor RF signal switching circuit along a signal conduction path Psc from an input node Nin to an output node Nout; b) contemporaneously conducting a compensation current Icc between Psc and an AC reference voltage vref via a compensation nonlinear impedance Znlc not modulated by the signal Sc, the nonlinearity of Znlc enhancing a suitability of Icc for compensation; c) developing a compensating harmonic signal Sh 2 at the frequency Fsh as a component of Sc due to conduction of Icc through an impedance distinct from Znlc; d) wherein Sh 2 has a phase and amplitude at Fsh related to a phase and amplitude of Sh 1 at Fsh such that a sum of Sh 1 plus Sh 2 has a lower amplitude at Fsh than does Sh 1 alone, across a target range of Sc amplitude.