Radio-frequency receiver and integrated circuit for use in...

Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation

Reexamination Certificate

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Details

C455S183100, C455S333000

Reexamination Certificate

active

10962850

ABSTRACT:
A radio-frequency (RF) receiver includes an input terminal for receiving RF signals in a first frequency band and a second frequency band lower than the first frequency band, a first tuned filter allowing a signal of a passing frequency in the RF signal in the first frequency band to pass through the filter, a local oscillator, a frequency divider for frequency-dividing a signal output from the local oscillator, a first mixer operable to convert the signal output from the first tuned filter into a signal of an intermediate frequency, a second tuned filter allowing a signal of a passing frequency of the RF signal in the second frequency band to pass through the filter, a second mixer operable to convert the signal output from the second tuned filter into a signal of the intermediate frequency, and a phase-locked-loop (PLL) circuit operable to control an oscillation frequency of the local oscillator and the passing frequencies of the first tuned filter and the second tuned filter.

REFERENCES:
patent: 6108050 (2000-08-01), Yamamoto et al.
patent: 6177964 (2001-01-01), Birleson et al.
patent: 6483552 (2002-11-01), Yamamoto
patent: 6573949 (2003-06-01), Yamamoto
patent: 6724440 (2004-04-01), Suan et al.
patent: 6842198 (2005-01-01), Suzuki et al.
patent: 7002639 (2006-02-01), Kawai
patent: 7120413 (2006-10-01), Lee et al.
patent: 2005/0032492 (2005-02-01), Asayama et al.
patent: 2006/0046678 (2006-03-01), Noda et al.
patent: 01-265688 (1989-10-01), None
patent: 2000-223956 (2000-08-01), None
patent: 2000-295539 (2000-10-01), None
patent: 2002-111526 (2002-04-01), None
patent: 2002-118795 (2002-04-01), None
patent: 2004-179841 (2004-06-01), None
patent: WO 01/20792 (2001-03-01), None
European Search Report for EP 04 02 4078, dated Feb. 15, 2005.

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