Title:
AMPLIFIER HAVING DISTORTION COMPENSATION FUNCTION
Document Type and Number:
Japanese Patent JP3560398
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the capacity of a distortion compensation table and to eliminate the need for the polar/orthogonal and orthogonal/polar coordinate transformation operations by generating a compensation coefficient from the error signal obtained between the input signal and the output of an amplifier based on the adaptive algorithm to compensate the distortion characteristic component of the amplifier.
SOLUTION: A compensation coefficient is generated from the error signal obtained between the input signal and the output of an amplifier 1 based on the adaptive algorithm to compensate the distortion characteristic component of the amplifier 1. That is, an estimated compensation coefficient generation circuit 50 applying the adaptive algorithm outputs a distortion compensation coefficient corresponding to the amplitude of a base band input signal X (t). Such coefficient uses a fact that it is equal to a function that is defined between the amplitude and phase distortions of the amplifier 1. Thereby, the circuit 50 has the distortion compensation coefficients corresponding to the input signal amplitude and the electric power or their functions. Then the signal X (t) is multiplied by the distortion compensation coefficient output of the circuit 50 by an amplifier 6.
Inventors:
Yasuyuki Oishi
Hideto Furukawa
Kazuo Hase
Eisuke Fukuda
Takeshi Takano
Hideto Furukawa
Kazuo Hase
Eisuke Fukuda
Takeshi Takano
Application Number:
JP22416995A
Publication Date:
September 02, 2004
Filing Date:
August 31, 1995
Export Citation:
Assignee:
富士通株式会社
International Classes:
H03F1/32; (IPC1-7): H03F1/32
Domestic Patent References:
| JP63121326A | ||||
| JP6037551A | ||||
| JP8181544A | ||||
| JP6310947A |
Attorney, Agent or Firm:
Hayashi Tsunetoku