Integrated frequency selectable resonant coupling network and method thereof
First Claim
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.
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Accused Products
Abstract
An integrated center frequency selectable resonant coupling network suited for use in an integrated circuit is disclosed. The network includes an integrated coupling transformer having a secondary winding for coupling to a load and a primary winding for coupling to a source; a first integrated capacitive circuit controllably coupled across one of the primary and secondary windings and when so coupled operable to resonate with the integrated coupling transformer at a frequency in a first frequency band; and a second integrated capacitive circuit coupled across a second one of the primary and the secondary windings that is operable to resonate with the integrated coupling transformer at a frequency in a second frequency band. The method is in an IC and includes providing and coupling an input signal within alternatively a first frequency band and a second frequency band to a primary winding of an integrated coupling transformer; controlling an integrated switched capacitor network, coupled to the transformer, to provide a coupling network that is alternatively and respectively resonant at a first and second frequency within the first and second frequency band thus selectively providing an output signal at a secondary winding of the transformer; and down converting the output signal.
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Citations
25 Claims
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1. An integrated center frequency selectable resonant coupling network comprising in combination:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. 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:
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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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method in an integrated circuit for processing signals in a plurality of frequency bends, the method including the steps of:
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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. - View Dependent Claims (24, 25)
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Specification