Title:
AMPLIFIER CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2005/039043
Kind Code:
A1
Abstract:
An amplifier circuit capable of improving communication quality. In the circuit, a constant envelope signal producing part (101) produces, from input signals (Si, Sq), first and second envelope signals. A phase shifter (102a) shifts the phase of the first envelope signal by a degree of +&agr &ring , while a phase shifter (102b) shifts the phase of the second envelope signal by a degree of +β&ring . A local signal phase shifter (107a) shifts a local signal from a local oscillator (106) by a degree of -&agr &ring , while a local signal phase shifter (107b) shifts the local signal from the local oscillator (106) by a degree of -β&ring . Mixers (103a,103b) use the local signals from the local signal phase shifters (107a,107b) to frequency convert the first and second envelope signals from the phase shifters (102a,102b). Amplifiers (104a, 104b) amplify the signals from the mixers (103a, 103b). A combiner circuit (105) combines signals from the amplifiers (104a, 104b).
Inventors:
IZUMI TAKASHI
IKEDA KAZUHIKO
SASAKI MAKOTO
IKEDA KAZUHIKO
SASAKI MAKOTO
Application Number:
PCT/JP2004/015534
Publication Date:
April 28, 2005
Filing Date:
October 20, 2004
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
IZUMI TAKASHI
IKEDA KAZUHIKO
SASAKI MAKOTO
IZUMI TAKASHI
IKEDA KAZUHIKO
SASAKI MAKOTO
International Classes:
H03F3/68; H03D7/00; H03F1/06; H03F1/32; H03F3/21; H03F3/24; H04L27/20; H04L27/38; H04B1/04; (IPC1-7): H03F3/24; H04B1/04
Foreign References:
| JP2003298357A | 2003-10-17 | |||
| JPH10270947A | 1998-10-09 | |||
| JP2001244752A | 2001-09-07 | |||
| JPH09261102A | 1997-10-03 | |||
| JP2000209291A | 2000-07-28 | |||
| JP2002101000A | 2002-04-05 |
Other References:
See also references of EP 1677417A4
Attorney, Agent or Firm:
Washida, Kimihito (Shintoshicenter Bldg. 24-1, Tsurumaki 1-chome, Tama-sh, Tokyo 34, JP)
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