Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2005-12-06
2009-06-30
Nguyen, Simon D (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
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.
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LG Electronics Inc.
Nguyen Simon D
Workman Nydegger
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