Title :
Simple, low-cost, subsystem fabrication
Author :
Hong-Zhi Liu ; Hou-Kuei Huang ; Chih-Cheng Wang ; Ray-Jay Chiu ; Che-Hung Lin ; Chen-Kuo Chu ; Mau-Phon Houng ; Yeong-Her Wang
Author_Institution :
Transcom Inc., Tainan, Taiwan
Abstract :
We have successfully developed a simple and low-cost 1.9-GHz, 25-W power amplifier by using only one prematched 50-mm PHEMT with external matching circuits on a FR-4 PCB. As the output stage integrated with other driver stages and dc control circuits, a completed four-stage power-amplifier subsystem is also demonstrated. When operating at 38.5-dBm output power with π/4-DQPSK signal, the proposed power amplifier subsystem shows low distortion, with better than 75-dBc ACPR (adjacent-channel leakage power ratio) at 600 kHz and 79-dBc ACPR at 900 kHz offset from the center frequency, and is suitable for PHS 500-mW base-station applications.
Keywords :
HEMT circuits; UHF power amplifiers; personal communication networks; π/4-DQPSK signal; 1.9 GHz; 25 W; 50 mm; 500 mW; ACPR; FR-4 PCB; PHEMT; PHS base-station applications; adjacent-channel leakage power ratio; four-stage power-amplifier subsystem; low distortion amplifier; low-cost power amplifier; personal handy phone applications; Capacitors; FETs; Fabrication; Gallium arsenide; Gold; Impedance matching; Indium gallium arsenide; Molecular beam epitaxial growth; PHEMTs; Substrates;
Journal_Title :
Circuits and Devices Magazine, IEEE
DOI :
10.1109/MCD.2005.1492713
