Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2007-10-16
2007-10-16
Nguyen, Tony T. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
C455S177100, C455S200100, C455S232100, C455S277200
Reexamination Certificate
active
10902765
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.
REFERENCES:
patent: 6292652 (2001-09-01), Kim
patent: 2005/0239428 (2005-10-01), Seendripu et al.
Broadcom Corporation
Garlick Bruce E.
Garlick & Harrison & Markison
Nguyen Tony T.
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