Title:
DISTORTION COMPENSATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2001/082473
Kind Code:
A1
Abstract:
A distortion compensation circuit for compensating for a nonlinear distortion of an output signal from a power amplifier circuit used in a radio communication device such as a cellular phone apparatus and the transmitting unit of a base or terminal station of a radio communication system. Particularly, an improvement of the predistorter system widely applicable to various kinds of radio systems with no need to add any distortion compensation circuit to the base band section, and with no dependence on the system used, except that a high frequency input signal exhibits an envelope variation. Memory means (3) that stores in advance the reverse distortion data of high frequency power amplifier means (12) as of a cellular phone apparatus is driven with its addresses being data obtained by detecting and digitalizing the envelope of a high frequency input signal exhibiting an envelope variation. The gain of gain variable means (10) disposed on a stage preceding the high frequency power amplifier means is adjusted to compensate for the distortion of the high frequency power amplifier means.
Inventors:
KUSUNOKI SHIGEO (JP)
YAMAMOTO KATSUYA (JP)
YAMAMOTO KATSUYA (JP)
Application Number:
PCT/JP2001/003411
Publication Date:
November 01, 2001
Filing Date:
April 20, 2001
Export Citation:
Assignee:
SONY CORP (JP)
KUSUNOKI SHIGEO (JP)
YAMAMOTO KATSUYA (JP)
KUSUNOKI SHIGEO (JP)
YAMAMOTO KATSUYA (JP)
International Classes:
H03F1/32; (IPC1-7): H03F1/32
Foreign References:
| US5151664A | 1992-09-29 | |||
| JPH04275708A | 1992-10-01 | |||
| US5963090A | 1999-10-05 | |||
| JPH05121958A | 1993-05-18 |
Other References:
See also references of EP 1282224A4
Attorney, Agent or Firm:
Matsukuma, Hidemori (Nishishinjuku 1-chome Shinjuku-ku Tokyo, JP)
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