Integrated frequency selectable resonant coupling network and method thereof

A radio frequency (RF) receiver front end integrated circuit (IC) arranged and constructed for receiving signals in a plurality of frequency bands, the IC comprising in combination:

• a low noise amplifier (LNA) for amplifying an input signal within the plurality of frequency bands;
• a center frequency selectable resonant coupling network comprising in combination;
• an integrated coupling transformer having a primary winding coupled to said LNA and a secondary winding including a fixed capacitor parallel coupled thereto;
• 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, said first integrated capacitive circuit arranged to present a balanced differential load to a differential signal provided by said LNA when said integrated switch is biased on or off;
• 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 and wherein controllably coupling a combination of said first integrated capacitive circuit and said second integrated capacitive circuit will resonate said integrated coupling transformer at a frequency in one of the plurality of frequency bands;
• and
• a radio frequency mixer for down converting an output signal at said secondary winding within either one of said first one of the plurality of frequency bands and a second one of the plurality of frequency bands to a base-band signal.

A method in an integrated circuit for processing signals in a plurality of frequency bends, the method including the steps of:

• providing an input signal within alternatively a first frequency band and a second frequency band, said input signal further comprising a differential input signal;
• coupling said input signal to a primary winding of an integrated coupling transformer;
• controlling, using an integrated switch that is actively biased on or off, an integrated switched capacitor network that presents a balanced load to said differential input signal and that is coupled to said transformer to provide a coupling network that is alternatively arid respectively resonant with said integrated coupling transformer at a first frequency within said first frequency band and a second frequency within said second frequency band to selectively provide an output signal at a secondary winding including a fixed capacitor, parallel coupled thereto, of said transformer;
• and
• down converting said output signal.