전력증폭기의 선형성 및 효율 향상에 관한 연구
A Study on Linearity and Efficiency Enhancement of Power Amplifier
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Abstract
In this paper, we have compared and analyzed the performance of high amplifier using Doherty technique to improve linearity and efficiency of base station and repeater power amplifier for WCDMA. This Doherty amplifier implements with 3 dB branch line coupler and 90 transmission line. The phase offset line is designed to maintain the high linearity and efficiency at the low efficiency period of the power amplifier.CW 1-tone experimental results at the WCDMA frequency 2.11∼2.17 GHz shows that Doherty amplifier, which achieves power add efficiency(PAE) of 50 % at 6 dB back off the point from maximum output power 52.3 dBm, obtains higher efficiency of 13.3 % than class AB. Finding optimum bias point after adjusted gate voltage, Doherty amplifier shows that IMD3 improves 4 dB.
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