DocumentCode
2170554
Title
Analog Controlled Adaptive Feedforward Amplifier for IMT-2000 Band
Author
Song, Young-Jean ; Oh, In-Ju ; Seo, Kyu-Jae ; Jeong, Yong-Chae ; Kim, Chul-Dong
Author_Institution
Dept. of Information & Communication Engineering Chonbuk National University, 664-14 Duchjin-Dong Duckjin-Gu Chonju Korea 561-756
fYear
2002
fDate
23-26 Sept. 2002
Firstpage
1
Lastpage
4
Abstract
A novel adaptive design for feedforward amplifier linearizer with analog controller is proposed in this paper. Compared previous adaptive linearizing method, this is new design which does not require any pilot signal and intentional signal distortion. In main signal cancellation loop, magnitude and phase of two-path signal in subtracter are compared mutually and controlled for main signal cancellation. In distortion signal cancellation loop, gain and phase of each path is controlled to maintain constant, so that the same level and out-of phase of two-path distortion signal are obtained. A prototype feedforward amplifier with the proposed linearizer has been tested for 3-carrier IS-95 CDMA signals and 20.25dB ACPR is improved.
Keywords
Adaptive control; Linearity; Nonlinear distortion; Phase distortion; Programmable control; RF signals; Radio frequency; Radiofrequency amplifiers; Switches; Voltage;
fLanguage
English
Publisher
ieee
Conference_Titel
Microwave Conference, 2002. 32nd European
Conference_Location
Milan, Italy
Type
conf
DOI
10.1109/EUMA.2002.339283
Filename
4140363
Link To Document