Canceling harmonics in semiconductor RF switches

Telecommunications – Transmitter and receiver at separate stations – Distortion – noise – or other interference prevention,...

Reexamination Certificate

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C455S067130, C333S101000, C333S103000

Reexamination Certificate

active

08081928

ABSTRACT:
An RF switching circuit adapted to cancel selected harmonic signals. An unwanted harmonic signal Sh1at a selected harmonic frequency Fsh of an operating frequency Fo exists in a signal Si conducted by the switching circuit, possibly produced by the switching circuit due to conduction through a first nonlinear impedance Znl(1). A compensating harmonic signal Sh2is therefore generated by conduction via a nonlinear impedance Znl(2). Znl(1) may be due to parasitic conduction by “off” switching elements, while Znl(2) may be due to conduction by an “on” FET. The amplitude and/or phasing of Sh2may be adjusted by selecting components for a network coupling Znl(2) to the conducted signal Si, such that Sh2substantially cancels Sh1across a target range of input power.

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