Patent ID: 6889036
Filing Date: 2005-05-03
Classification: H03F,H03H,H04B

Abstract:
1. An integrated center frequency selectable resonant coupling network comprising in combination: an integrated coupling transformer having a secondary winding including a fixed capacitor parallel coupled thereto for coupling to a load and a primary winding for coupling to a source; a first integrated capacitive circuit controllably coupled, by an integrated switch that is actively biased on or off, across a first one of said primary winding and said secondary winding and when so coupled operable to resonate with said integrated coupling transformer at a first frequency in a first frequency band, said first integrated capacitive circuit arranged to present a balanced differential load to a differential signal provided by said source when said integrated switch is biased on or off; and a second integrated capacitive circuit controllably coupled across a second one of said primary winding and said secondary winding and when so coupled operable to resonate with said integrated coupling transformer at a second frequency in a second frequency band.