A switching power amplifier with feedback for improving total harmonic distortion
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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.
KeywordsEfficiency Distortion Hearing aids
The authors would like to thank the national chip implementation center (CIC) for the chip fabrication.
- 1.Dapkus, D. (2000). Class-D audio amplifiers: An overview. Consumer electronics, 2000. ICCE. 2000 Digest of Technical Papers, pp. 400–401.Google Scholar
- 2.Tan M. T., Chang, J. S. Cheng, Z. H., & Tong Y. C. (1998). A novel self-error correction pulse width modulator for a class D amplifier for hearing instruments. IEEE ISCAS’98 (Vol. 1, pp. 261–264).Google Scholar
- 3.Tan M. T., Chua, H. C., Gwee, B. H., & Chang, J. S. (2000). An investigation on the parameters affecting total harmonic distortion in class D amplifiers. IEEE ISCAS ( Vol. 4, pp. 193–196).Google Scholar
- 5.Andersson, O. (1998). Class D hearing aid amplifier with feedback. United States Patent, no. 5815581.Google Scholar
- 6.Chang J. S., Gwee, B. H., Lon, Y. S., & Tan, M. T. (2001) A novel low-power low-voltage Class D amplifier with feedback for improving THD, power efficiency, gain linearity. Circuits and systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium (Vol. 1(6–9), 635–638).Google Scholar
- 7.Li S.C., & Vincent Chia-Chang Lin. (2004). A high efficiency 0.5W BTL class-D audio amplifier with RWDM technique. Proceedings of the ASP-DAC 2004 (pp. 307–309).Google Scholar
- 10.Sedra A. S., & Smith K. C. (1998). Microelectronic Circuits (pp. 1049–1058) Oxford University Press.Google Scholar