Title:
TRANSMISSION CIRCUIT AND COMMUNICATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2008/015970
Kind Code:
A1
Abstract:
Provided is a transmission circuit (1) which accurately compensates offset characteristics
of an amplitude modulating section (15) and operates at low distortion and high
efficiency over a wide output power range. A signal generating section (11)
outputs an amplitude signal and an angle modulation signal. An amplitude amplifying
section (14) supplies the amplitude modulating section (15) of a voltage corresponding
to the magnitude of the inputted amplitude signal. The amplitude modulating
section (15) modulates the amplitude of an angle modulation signal by the voltage
supplied from the amplitude amplifying section (14), and outputs it as a modulation
signal. A temperature measuring section measures the temperature of the amplitude
modulating section (15). An offset compensating section (12) calculates an
offset compensation value based on the temperature change of the amplitude modulating
section (15) from an initial status, and adds the calculated offset compensation
value to the amplitude signal.
More Like This:
Inventors:
MATSUURA, Toru (())
松浦 徹 (())
松浦 徹 (())
Application Number:
JP2007/064757
Publication Date:
February 07, 2008
Filing Date:
July 27, 2007
Export Citation:
Assignee:
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1006, Oaza Kadoma Kadoma-sh, Osaka 01, 5718501, JP)
松下電器産業株式会社 (〒01 大阪府門真市大字門真１００６ Osaka, 5718501, JP)
MATSUURA, Toru (())
松下電器産業株式会社 (〒01 大阪府門真市大字門真１００６ Osaka, 5718501, JP)
MATSUURA, Toru (())
International Classes:
H04B1/04; H03F1/32; H04L27/04
Attorney, Agent or Firm:
OGASAWARA, Shiro (Daido-Seimei Esaka Bldg, 13th Floor 1-23-101, Esakach, Suita-shi Osaka 63, 5640063, JP)
Download PDF: