A 1.85 GHz band linearizer using the feedforward loop without delay lines

Author

Cho, Kyoung-Joon ; Kim, Wan-Jong ; Kim, Jong-Heon

Author_Institution

Dept. of Radio Sci. & Eng., Kwangwoon Univ., Seoul, South Korea

fYear

2000

fDate

2000

Firstpage

1048

Lastpage

1051

Abstract

This paper presents a linearizer using the feedforward loop without delay lines which can be applied to personal communication system (PCS) base-station applications. This linearizer uses an IM amplifier and an auxiliary amplifier in order to remove the delay lines used in the feedforward technique. The delay line in the error loop is changed by the main power amplifier (PA) and the error amplifier is utilized to amplify the error signal which is combined with the output of the main amplifier. Two-tone signals at 1.85 GHz and 1.85125 GHz with -17 dBm/tone from synthesizers are injected into the linearizer. The main PA in the linearizer with a gain of 50 dB and an average power of 10 W was fabricated. The reduction of intermodulation distortion (IMD) is around 19 dB

Keywords

UHF power amplifiers; error compensation; feedforward; intermodulation distortion; linearisation techniques; personal communication networks; radio equipment; 1.85 GHz; 1.85125 GHz; 10 W; 50 dB; IM amplifier; IMD reduction; PCS base-station applications; auxiliary amplifier; error amplifier; error loop; feedforward loop; intermodulation distortion; linearizer; personal communication system; power amplifier; Delay lines; Directional couplers; Gain; High power amplifiers; Interference; Linearization techniques; Personal communication networks; Power amplifiers; Synthesizers; Wireless communication;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2000 Asia-Pacific

Conference_Location

Sydney, NSW

Print_ISBN

0-7803-6435-X

Type

conf

DOI

10.1109/APMC.2000.926008

Filename

926008