Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2007-07-12
2011-10-11
Le, Thanh (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S307000
Reexamination Certificate
active
08036623
ABSTRACT:
This disclosure describes techniques for reducing adverse effects of TX signal leakage in a full-duplex, wireless communication device. The techniques make use of a notch filter to reject TX signal leakage in a signal processed in the RX path of the wireless communication device. The notch filter may be constructed as a complex notch filter using passive resistor and capacitor components to produce a notch frequency that attenuates TX signal leakage components in a desired signal. The notch filter may be applied to a down-converted, baseband signal produced by a passive mixer.
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International Search Report and Written Opinion—PCT/US2008/056711, International Search Authority—European Patent Office—Nov. 4, 2008.
Cabanillas Jose
Chang Li-Chung
Gudem Prasad S.
Jenckes Kenyon S.
Le Thanh
Mobarhan Ramin
QUALCOMM Incorporated
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