Wireless receiver with notch filter to reduce effects of...

Details Wireless receiver with notch filter to reduce effects of... Wireless receiver with notch filter to reduce effects of...

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.

REFERENCES:
patent: 6035213 (2000-03-01), Tokuda et al.
patent: 7127226 (2006-10-01), Tolson
patent: 7155179 (2006-12-01), Rothenberg
patent: 2005/0107051 (2005-05-01), Aparin et al.
patent: 2008/0009258 (2008-01-01), Safarian et al.
patent: 1675270 (2006-06-01), None
International Search Report and Written Opinion—PCT/US2008/056711, International Search Authority—European Patent Office—Nov. 4, 2008.

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