Feedforward Amplifier using Equal Group-Delay Signal Canceller

Author

Jeong, Yong-Chae ; Ahn, Dal ; Kim, Chul-Dong ; Chang, Ik-soo

Author_Institution

Sch. of Electron. & Inf. Eng., Chonbuk Nat. Univ., Jeonju

fYear

2006

fDate

11-16 June 2006

Firstpage

1530

Lastpage

1533

Abstract

In this paper, a new signal canceller that can matches an out-of-phase and a group delay of two path signals simultaneously is proposed. The simultaneous matching of the out-of-phase and the group delay time between two paths can makes a broadband signal cancellation possible. A feedforward linearizing power amplifier that adopts the proposed signal cancellers is fabricated on IMT-2000 base-station transmitting band. The main signal cancellation (or the 1^st) loop of the fabricated feedforward amplifier cancel input signal more than 26.3dB and the intermodulation distortion (IMD) signal cancellation (or the 2^nd) loop cancel IMD signal more than 15.2dB for 200MHz bandwidth. With the two-tone signals amplification process, the C/I ratio of the amplifier is improved 20.8dB, where the two tones are 2115MHz and 2165MHz, respectively

Keywords

3G mobile communication; linearisation techniques; power amplifiers; 2115 MHz; 2165 MHz; IMT-2000; base-station transmitting band; broadband signal cancellation; feedforward amplifier; group delay signal; intermodulation distortion; out-of-phase signal; power amplifier; signal canceller; Bandwidth; Broadband amplifiers; Delay effects; Equalizers; High power amplifiers; Intermodulation distortion; Linearity; Linearization techniques; Power amplifiers; Radiofrequency amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2006. IEEE MTT-S International

Conference_Location

San Francisco, CA

ISSN

0149-645X

Print_ISBN

0-7803-9541-7

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2006.249604

Filename

4015226