Title:
COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2002/067452
Kind Code:
A1
Abstract:
A communication device which generates transmission signals and reception signals using two oscillators and at the same time minimizes the generation of spurious components. As shown in Figs. 9A, 9B, VCO2's oscillation frequency fVCO2=N$m(x)(2$m(x)fDD), fDD being the difference between transmission frequency fT and reception frequency fR. A signal having a frequency of 3$m(x)fDD is output from a 3/(2$m(x)N) frequency multiplication circuit. A signal having a frequency of 2$m(x)fDD is output from an N divider. The results are that a transmitting intermediate frequency fTIF=3$m(x)fDD and a receiving intermediate frequency fRIF=2$m(x)fDD. The oscillation frequency fVCO1 of VCO1 is fCH. Therefore, a transmission frequency fT=fCH + fTIF=fCH + 3$m(x)fDD. This circuit does not pose a transmission spurious problem with a self-reception band.
Inventors:
MIYA SHINJI (JP)
SAITO NOBUO (JP)
SAITO NOBUO (JP)
Application Number:
PCT/JP2002/001571
Publication Date:
August 29, 2002
Filing Date:
February 21, 2002
Export Citation:
Assignee:
ASAHI CHEMICAL MICRO SYST (JP)
MIYA SHINJI (JP)
SAITO NOBUO (JP)
MIYA SHINJI (JP)
SAITO NOBUO (JP)
International Classes:
H03D7/16; H04B1/40; H04B15/04; H04B15/06; (IPC1-7): H04B1/50
Foreign References:
| JPH0541673A | 1993-02-19 | |||
| JPH0575495A | 1993-03-26 | |||
| JPH05110469A | 1993-04-30 | |||
| JPH08331005A | 1996-12-13 | |||
| JPH09233143A | 1997-09-05 | |||
| JPH09261106A | 1997-10-03 |
Attorney, Agent or Firm:
Tani, Yoshikazu (Akasaka 2-chome Minato-ku, Tokyo, JP)
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