Title :
Dual-band predistortion power amplifier for digital cellular and IMT-2000 base-station application
Author :
Choi, Heung-Jae ; Jeong, Hee-Young ; Kim, Young ; Lim, Jong-Sik ; Kim, Chul-Dong ; Jeong, Yong-Chae
Author_Institution :
Dept. of Inf. & Commun. Eng., Chonbuk Nat. Univ., Jeonju, South Korea
Abstract :
This paper proposes a dual-band predistortion power amplifier using diplexer for digital cellular (f0=880MHz) and IMT-2000(f0=2140MHz) base station. Each high power amplifier is linearized by using predistortion method. The implemented predistorter uses reflection type IM generator with 3dB hybrid coupler for good reflection characteristic. The diplexer is composed of low pass filter using defected ground structure(DGS) microstrip line and high pass filter using high-Q lumped capacitors and distributed elements. For a forward link one-carrier CDMA IS-95 and WCDMA signal, the proposed dual-band predistortion power amplifier shows ACPR improvement of about 10dBc and 9.36dBc for cellular and IMT-2000 band of operation, respectively.
Keywords :
3G mobile communication; UHF power amplifiers; cellular radio; code division multiple access; high-pass filters; low-pass filters; microstrip lines; multiplexing equipment; 2140 MHz; 880 MHz; CDMA IS-95; DGS; IMT-2000 base-station; WCDMA signal; defected ground structure; digital cellular; diplexer; distributed elements; dual-band power amplifier; high pass filter; high-Q lumped capacitors; hybrid coupler; low pass filter; microstrip line; predistortion method; predistortion power amplifier; reflection type IM generator; Base stations; Character generation; Dual band; High power amplifiers; Hybrid power systems; Low pass filters; Multiaccess communication; Power amplifiers; Predistortion; Reflection; base-station; dual-band; power amplifier; predistortion;
Conference_Titel :
Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings
Print_ISBN :
0-7803-9433-X
DOI :
10.1109/APMC.2005.1606225
