Communication device

Details Communication device Communication device

2005-08-16

2005-08-16

Nguyen, Simon (Department: 2685)

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

C455S076000, C455S255000, C455S318000, C455S550100

Reexamination Certificate

active

06931237

ABSTRACT:
A communication apparatus is provided which employs two oscillators to generate a transmission signal and a reception signal, and prevents harmful spurious components from being produced. As shown in FIGS.9A and9B, the oscillation frequency fVCO2of a VCO2is given by fVCO2=N×(2×fDD), where fDD is the difference between the transmit frequency fT and receive frequency fR. A 3/(2×N) frequency multiplier outputs a signal with a frequency 3×fDD, and a divide-by-N circuit (2/(2×N) frequency multiplier) outputs a signal with a frequency 2×fDD. Thus the transmit intermediate frequency fTIF is given by fTIF=3×fDD, and the receive intermediate frequency fRIF is given by fRIF=2×fDD. The oscillation frequency fVCO1of a VCO1is fCH. The transmit frequency fT is given by fT=fCH+fTIF=fCH+3×fDD. The circuit can prevent a transmission spurious problem to its own reception band.

REFERENCES:
patent: 5689819 (1997-11-01), Nishimura et al.
patent: 5794131 (1998-08-01), Cairns
patent: 5966666 (1999-10-01), Yamaguchi et al.
patent: 6061575 (2000-05-01), Lombardi
patent: 6154640 (2000-11-01), Itoh et al.
patent: 6754474 (2004-06-01), Savelli et al.
patent: 6826388 (2004-11-01), Tanaka et al.
patent: 0792052 (1997-02-01), None
patent: 0 792 052 (1997-08-01), None
patent: 7-283842 (1975-10-01), None
patent: 05041673 (1993-02-01), None
patent: 05075495 (1993-03-01), None
patent: 05110469 (1993-04-01), None
patent: 8-331005 (1996-12-01), None
patent: 9-233143 (1997-09-01), None
patent: 9-261106 (1997-10-01), None
patent: 10-4437 (1998-01-01), None
patent: 2000-78051 (2000-03-01), None

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