Title:
SEMICONDUCTOR INTEGRATED CIRCUIT FOR COMMUNICATION
Document Type and Number:
WIPO Patent Application WO/2003/043208
Kind Code:
A1
Abstract:
A plurality of bands share an orthogonal modulation circuit for modulating two oscillation frequency signals having phases shifted by 90 degrees by using transmission data (I, Q). As an output load of the orthogonal modulation circuit, an LC resonance circuit consisting of inductance L and capacity C is used instead of the conventionally used resistor. The value of L or C constituting the resonance circuit is switched according to the transmission band.
Inventors:
OONO MASACHIKA (JP)
MATSUI HIROAKI (JP)
YAHAGI KOICHI (JP)
MATSUI HIROAKI (JP)
YAHAGI KOICHI (JP)
Application Number:
PCT/JP2002/010715
Publication Date:
May 22, 2003
Filing Date:
October 16, 2002
Export Citation:
Assignee:
HITACHI LTD (JP)
OONO MASACHIKA (JP)
MATSUI HIROAKI (JP)
YAHAGI KOICHI (JP)
OONO MASACHIKA (JP)
MATSUI HIROAKI (JP)
YAHAGI KOICHI (JP)
International Classes:
H03C3/40; H04B1/04; H04L27/20; H04L27/32; H04L27/36; H04B1/30; H04B1/40; H04L27/00; (IPC1-7): H04B1/04; H04B1/30; H04B1/40; H04L27/00
Domestic Patent References:
| WO1999001933A2 | 1999-01-14 |
Foreign References:
| JP2001044858A | 2001-02-16 | |||
| JPH09275321A | 1997-10-21 | |||
| JP2001211098A | 2001-08-03 |
Attorney, Agent or Firm:
Obinata, Tomio (4 Kagurazaka 3-chom, Shinjuku-ku Tokyo, JP)
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