Title:
AMPLIFIER CIRCUIT AND WIRELESS COMMUNICATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/125261
Kind Code:
A1
Abstract:
Disclosed is an amplifier circuit (1) of an envelope tracking method provided with a timing adjustment unit (1B) comprising a limited number of adjustment values for adjusting the time by which output is delayed in response to input and capable of adjusting the mutual time difference of input signals arriving at the amplifier (100) and the power supply voltage by selection of the adjustment value; a test signal output unit (108) capable of repeatedly sending a test signal as an input signal at predetermined periods; and an adjustment value determination unit (109) for sequentially measuring m (where m is an arbitrary natural number less than or equal to k) periods of output power of the amplifier (100) while modifying the adjustment value at the timing adjustment unit (1B) to a different value every k (where k is an arbitrary natural number) periods of the test signal, searching for the adjustment value at which the total (or average) of m periods of the output power is maximized, and setting the adjustment value for the timing adjustment unit (1B).
Inventors:
ONISHI MASAHIKO (JP)
Application Number:
PCT/JP2010/072379
Publication Date:
October 13, 2011
Filing Date:
December 13, 2010
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
ONISHI MASAHIKO (JP)
ONISHI MASAHIKO (JP)
International Classes:
H03F1/32; H03F1/06; H03F3/189; H03F3/24
Foreign References:
| JP2009232296A | 2009-10-08 | |||
| JP2001189685A | 2001-07-10 |
Other References:
DONALD F. KIMBALL ET AL.: "High-Efficiency Envelope-Tracking W-CDMA Base-Station Amplifier Using GaN HFETs", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 54, no. 11, November 2006 (2006-11-01), XP011149867, DOI: doi:10.1109/TMTT.2006.884685
FEIPENG WANG ET AL.: "Design of Wide-Band Envelope-Tracking Power Amplifiers for OFDM Applications", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 53, no. 4, April 2005 (2005-04-01)
See also references of EP 2557682A4
FEIPENG WANG ET AL.: "Design of Wide-Band Envelope-Tracking Power Amplifiers for OFDM Applications", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 53, no. 4, April 2005 (2005-04-01)
See also references of EP 2557682A4
Attorney, Agent or Firm:
SunCrest Patent and Trademark Attorneys (JP)
Patent business corporation Sun Crest international patent firm (JP)
Patent business corporation Sun Crest international patent firm (JP)
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