Method and apparatus for digital switching of FM signals with reduced crosstalk

Abstract

Apparatus for digital switching of FM signals includes multiple functional switching circuits, each having an input for receiving an FM signal at a first frequency and each generating first switching transients in response to the FM signal. The apparatus includes a dummy switching circuit corresponding to each functional switching circuit. The dummy switching circuits generate second switching transients in response to the FM signal. The second switching transients are shifted in phase relative to the first switching transients such that a crosstalk signal resulting from the first and second switching transients has a frequency of twice the first frequency. The apparatus further includes filters for attenuating the crosstalk signal. By shifting the frequency of the crosstalk signal to twice the frequency of the FM signal, the crosstalk signal is easily filtered.

Dependencies are inferred from the claim text.