Canceling harmonics in semiconductor RF switches

  • US 20060194558A1
  • Filed: 02/03/2006
  • Published: 08/31/2006
  • Est. Priority Date: 02/03/2005
  • Status: Active Grant
First Claim
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1. A method of canceling unwanted harmonic signal component Sh1 at a frequency Fsh that is a selected harmonic of an operating frequency Fo of a signal Sc that is conducted by an integrated semiconductor RF signal switching circuit along a signal conduction path Psc from an input node Nin to an output node Nout, the method comprising:

  • a) conducting a compensation current Icc between Psc and an AC reference voltage vref via a compensation nonlinear impedance Znlc;

    b) developing a compensating harmonic signal Sh2 at the frequency Fsh as a component of Sc due to conduction of Icc through an impedance;

    c) wherein Sh2 has a phase and amplitude at Fsh related to a phase and amplitude of Sh1 at Fsh such that a sum of Sh1 plus Sh2 has a lower amplitude at Fsh than does Sh1 alone, across a target range of Sc amplitude.

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