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Patent Searching and Data


Title:
DISTORTION COMPENSATION CIRCUIT
Document Type and Number:
Japanese Patent JP3160081
Kind Code:
B2
Abstract:

PURPOSE: To enhance compensation accuracy for the fluctuation of an output signal level in a distortion compensation circuit which compensates nonlinear distortion generated in a power amplifier.
CONSTITUTION: This distortion compensation circuit equipped with an input signal processing means 11 which generates a branch input signal in which the power level and phase of an input signal are shifted, a distortion extraction means 13 which extracts the distortion component of an output signal by synthesizing the branch input signal with the output signal of the power amplifier for the input signal, and a distortion compensation means 15 which suppresses the distortion component by synthesizing with the output signal in negative phase is comprised by providing with a phase control means 17 which detects the phase difference of the branch input signal and the output signal from the product of them, and varies the shift quantity of the phase of the input signal processing means 11 corresponding to the phase difference, and a power control means 19 which detects the difference of the power levels of the branch input signal and the output signal, and varies the shift quantity of the power level of the input signal processing means 11 corresponding to the difference.


Inventors:
Shibuya, Yasuhiro
Application Number:
JP1992000190395
Publication Date:
April 23, 2001
Filing Date:
July 17, 1992
Export Citation:
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Assignee:
FUJITSU LTD
International Classes:
H03F1/32; (IPC1-7): H03F1/32
Attorney, Agent or Firm:
古谷 史旺 (外1名)