Adaptive mixer output filter bandwidth control for variable conversion gain down-conversion mixer
First Claim
1. Adaptive mixer, comprising:
- a conversion gain module operable to receive a radio frequency signal and to generate an intermediate frequency signal therefrom, wherein said intermediate frequency signal has a predetermined first bandwidth;
a gain control module operable to change the gain of said conversion gain module from a first gain to a second gain, thereby generating an intermediate frequency signal at a second gain, wherein said intermediate frequency sigbnal generated at said second gain has a second bandwidth;
a bandwidth control module operable to change the bandwidth of said intermediate frequency signal from said second bandwidth to said first predetermined bandwidth.
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Abstract
An improved adaptive mixer for use in the down conversion module of a wireless transceiver. The adaptive mixer comprises a conversion gain module that is operable to receive a radio frequency signal and to generate an intermediate frequency that is provided to a radio interface in a wireless transceiver. The radio interface is operable to generate a gain control signal and a bandwidth control signal. The gain control signal is provided to a gain control module that is operable to select a combination of load resistance values that will provide a predetermined gain level for the output of the conversion gain module. Bandwidth control logic in the adaptive mixer uses the bandwidth control signal to operably connect a plurality of bandwidth control capacitors to the conversion gain module to control the bandwidth of the output signal. By selecting predetermined values for the load resistance and for the bandwidth control capacitors, the method and apparatus of the present invention makes it possible to generate an intermediate frequency output signal having a predetermined gain and a predetermined bandwidth.
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Citations
33 Claims
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1. Adaptive mixer, comprising:
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a conversion gain module operable to receive a radio frequency signal and to generate an intermediate frequency signal therefrom, wherein said intermediate frequency signal has a predetermined first bandwidth;
a gain control module operable to change the gain of said conversion gain module from a first gain to a second gain, thereby generating an intermediate frequency signal at a second gain, wherein said intermediate frequency sigbnal generated at said second gain has a second bandwidth;
a bandwidth control module operable to change the bandwidth of said intermediate frequency signal from said second bandwidth to said first predetermined bandwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of generating an intermediate frequency using an adaptive mixer, comprising:
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receiving a radio frequency signal and using a conversion gain module to generate an intermediate frequency signal therefrom, wherein said intermediate frequency signal has a predetermined first bandwidth;
changing the gain of said conversion gain module from a first gain to a second gain, thereby generating an intermediate frequency signal at a second gain, wherein said intermediate frequency signal generated at said second gain has a second bandwidth; and
changing the bandwidth of said intermediate frequency signal from said second bandwidth to said first predetermined bandwidth. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A wireless interface system that services communications between a wirelessly enabled host and at least one user input device, comprising:
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a front end module operable to receive an incoming signal at an RF frequency;
a transceiver module operable to process said incoming signal at an RF frequency and to generate an intermediate (IF) frequency signal therefrom;
wherein said transceiver module futher comprises;
a conversion gain module operable to receive a radio frequency signal and to generate an intermediate frequency signal therefrom, wherein said intermediate frequency signal has a predetermined first bandwidth;
a gain control module operable to change the gain of said conversion gain module from a first gain to a second gain, thereby generating an intermediate frequency signal at a second gain, wherein said intermediate frequency signal generated at said second gain has a second bandwidth;
a bandwidth control module operable to change the bandwidth of said intermediate frequency signal from said second bandwidth to said first predetermined bandwidth; and
processing circuitry operable to receive said IF frequency signal and to generate digital data signals therefrom. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification