A switching power amplifier with feedback for improving total harmonic distortion

Authors:
Chia-Hsiung Kao;Ping-Yu Tsai;Wen-Pin Lin;Yao-Jen Chuang
Affiliations:
National Sun Yat-Sen University, Kaohsiung, Taiwan 804;National Sun Yat-Sen University, Kaohsiung, Taiwan 804;National Sun Yat-Sen University, Kaohsiung, Taiwan 804;National Sun Yat-Sen University, Kaohsiung, Taiwan 804
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2008

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Abstract

A high efficiency and low distortion and switching power amplifier is proposed. We use feedback to reduce the total harmonic distortion (THD) and the DC output bias current. The experimental results show that the proposed circuit has 0.24% total harmonic distortion and 91% power efficiency while the DC output bias current is 12 μA at 1.5 V supply voltage.