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Performance Enhancement of Hybrid Doherty Amplifier using Drain bias control  

Lee Suk-Hui (Dept. of Electronic and Computer Engineering Dankook University)
Lee Sang-Ho (Dept. of Electronic and Computer Engineering Dankook University)
Bang Sung-Il (Dept. of Electronic and Computer Engineering Dankook University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.43, no.5, 2006 , pp. 128-136 More about this Journal
Abstract
In this paper, design and implement 50W Doherty power amplifiers for 3GPP repeater and base station transceiver system. Efficiency improvement and high power property of ideal Doherty power amplifier is distinguishable; however bias control for implementation of Doherty(GDCHD) amplifier is difficult. To solve the problem, therefore, GDCHD(Gate and Drain Control Hybrid Doherty) power amplifier is embodied to drain bias adjustment circuit to Doherty power amplifier with gate bias adjustment circuit. Experiment result shows that $2.11{\sim}2.17\;GHz$, 3GPP operating frequency band, with 57.03 dB gain, PEP output is 50.30 dBm, W-CDMA average power is 47.01 dBm, and -40.45 dBc ACLR characteristic in 5MHz offset frequency band. Each of the parameter satisfied amplifier specification which we want to design. Especially, GDCHD power amplifier shows proper efficiency performance improvement in uniformity ACLR than Doherty power amplifier.
Keywords
Doherty amplifier; Efficiency enhancement; Bias control;
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