Title:
TRANSMITTER, RECEIVER, AND WIRELESS COMMUNICATION DEVICE COMPRISING TRANSMITTER AND RECEIVER
Document Type and Number:
WIPO Patent Application WO/2003/084083
Kind Code:
A1
Abstract:
The generation frequency band of a first IF signal generated by a digital signal modulator (11a) frequency band of a transmission signal, is adjusted depending on the so that the generation frequency band is compatible with the upper frequency edge of a first IF band-pass filter (14). In addition, the oscillation frequency of a first local oscillator (24a) is adjusted so that a second IF signal, generated by converting the first IF signal by a first frequency converter (23a), compatible with the lower frequency edge of a second IF band-pass filter (25). This allows the transmission signal, including a plurality of frequency bands, to be transmitted with no additional filter and without providing a switch for the filter.
Inventors:
NOGUCHI SHIGETAKA (JP)
Application Number:
PCT/JP2003/003882
Publication Date:
October 09, 2003
Filing Date:
March 27, 2003
Export Citation:
Assignee:
SHARP KK (JP)
NOGUCHI SHIGETAKA (JP)
NOGUCHI SHIGETAKA (JP)
International Classes:
H04B1/04; (IPC1-7): H04B1/04; H04B1/10; H04B1/26
Foreign References:
| JP2000236268A | 2000-08-29 | |||
| JPH077446A | 1995-01-10 | |||
| JPH0946249A | 1997-02-14 | |||
| JPH05227051A | 1993-09-03 | |||
| JP2001103024A | 2001-04-13 | |||
| JPH10285063A | 1998-10-23 |
Attorney, Agent or Firm:
Fujimoto, Eisuke c/o Fujimoto Patent & Law Office (Room 317 Sanno Grand Building 3F., 14-2,
Nagata-cho 2-chom, Chiyoda-ku Tokyo, JP)
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