Apparatus for frequency direct conversion reception in...

Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion

Reexamination Certificate

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Details

C455S285000, C455S318000, C455S326000

Reexamination Certificate

active

07555280

ABSTRACT:
An apparatus for frequency direct conversion reception in a mobile communication terminal and method thereof are disclosed, by which a DC offset can be removed. The present invention includes a power distributor configured to distribute a radio frequency input signal into two signals having 180° phase differences, an equal phase directionality coupler configured to receive a single local signal provided by a local oscillator in order to distribute the single local signal into two output signals having the same phase, a pair of mixers, each configured to mix one of the two distributed local signals with one of the two distributed radio frequency signals in order to output a signal in downlink centering on a DC, a pair of baseband gain buffer amplifiers, each configured to deliver without load effect one of the two signals outputted from each of the pair of mixers to a rear end of the apparatus, a pair of pass filters, each configured to allow only low frequency band signals of the signals output by the pair of baseband gain buffer amplifiers to pass through, and a low frequency subtraction circuit configured to receive and compare the size of the signals that pass through the pair of pass filters.

REFERENCES:
patent: 4308473 (1981-12-01), Carnes
patent: 6073001 (2000-06-01), Sokoler
patent: 6510314 (2003-01-01), Kuo
patent: 6694129 (2004-02-01), Peterzell et al.
patent: 6711397 (2004-03-01), Petrov et al.
patent: 7003263 (2006-02-01), Fischer et al.
patent: 7035615 (2006-04-01), Kim et al.
patent: 7054610 (2006-05-01), Itoh et al.
patent: 2002/0155822 (2002-10-01), Adachi
patent: 2003/0078020 (2003-04-01), Kintis
patent: 2003/0109238 (2003-06-01), Kim et al.
patent: 2004/0063418 (2004-04-01), Kluge et al.
patent: 2008/0051051 (2008-02-01), Kral
patent: 1266554 (2000-09-01), None

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