A 94% efficiency near-constant frequency self-oscillating class-D audio amplifier with voltage control resistor

Shao Siang Ng, Kuei Liang Lin, Ke-Horng Chen, Yu Wen Chen

研究成果: Conference contribution

2 引文 斯高帕斯(Scopus)

摘要

A self-oscillating constant frequency class-D audio amplifier with voltage control resistor (VCR) technique is proposed for system-on-a-chip (SoC) applications. The VCR control circuit is used to ensure stable switching frequency over a wide range of the modulation index. The proposed method also improves the THD performance at high output power condition. The proposed self-oscillating class-D amplifier can have extremely good performance since the carrier distortion is avoided and the intrinsic harmonic can be attenuated by the second-order loop filter. The VCR control can dynamically adjust the switching frequency according to distinct modulation index. In addition, stable frequency operation can reduce the switching frequency at low output amplitude to improve power efficiency. Experimental results demonstrate that the proposed class-D amplifier can delivers 1.4W to the 8 load with a 5V supply. The power efficiency is achieved over 95% and the output THD can be smaller than 0.001%.

原文English
主出版物標題2013 IEEE International Symposium on Circuits and Systems, ISCAS 2013
頁面602-605
頁數4
DOIs
出版狀態Published - 9 九月 2013
事件2013 IEEE International Symposium on Circuits and Systems, ISCAS 2013 - Beijing, China
持續時間: 19 五月 201323 五月 2013

出版系列

名字Proceedings - IEEE International Symposium on Circuits and Systems
ISSN(列印)0271-4310

Conference

Conference2013 IEEE International Symposium on Circuits and Systems, ISCAS 2013
國家China
城市Beijing
期間19/05/1323/05/13

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  • 引用此

    Ng, S. S., Lin, K. L., Chen, K-H., & Chen, Y. W. (2013). A 94% efficiency near-constant frequency self-oscillating class-D audio amplifier with voltage control resistor. 於 2013 IEEE International Symposium on Circuits and Systems, ISCAS 2013 (頁 602-605). [6571914] (Proceedings - IEEE International Symposium on Circuits and Systems). https://doi.org/10.1109/ISCAS.2013.6571914