A low THD clock-free Class-D audio amplifier with an increased damping resistor and cross offset cancellation technique

Ying Wei Chou, Meng Wei Chien, Shin Chieh Chen, Ke-Horng Chen, Ying Hsi Lin, Tsung Yen Tsai, Chen Chih Huang, Chao Cheng Lee, Zhih Han Tai, Yi Hsuan Cheng, Chi Chung Tsai, Hsin Yu Luo, Shih Ming Wang, Long Der Chen, Cheng Chen Yang, Huang Tian Hui

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

An increased damping resistor (IDR) replaces high-order loop filter to simply reduce the total harmonic distortion (THD) of Class-D audio amplifier. Besides, cross offset cancellation (COC) technique minimizes the system offset voltage to avoid dc current flows to the speaker in the bridge tied load (BTL) structure. Furthermore, variable switching frequency characteristic in self-oscillating modulation spreads the electro-magnetic interference (EMI) impact out on the output frequency spectrum. Experimental results demonstrate that the proposed Class-D amplifier can deliver 0.55W to the 8ω load with a 3.3V supply voltage with 150-nm CMOS process. The power efficiency is over 90% and the output THD is smaller than 0.01% (80dB).

Original languageEnglish
Title of host publication2014 IEEE International Symposium on Circuits and Systems, ISCAS 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2680-2683
Number of pages4
ISBN (Print)9781479934324
DOIs
StatePublished - 1 Jan 2014
Event2014 IEEE International Symposium on Circuits and Systems, ISCAS 2014 - Melbourne, VIC, Australia
Duration: 1 Jun 20145 Jun 2014

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
ISSN (Print)0271-4310

Conference

Conference2014 IEEE International Symposium on Circuits and Systems, ISCAS 2014
CountryAustralia
CityMelbourne, VIC
Period1/06/145/06/14

Keywords

  • audio amplifier
  • Class-D audio amplifier
  • clock-free
  • mobile application
  • offset cancellation
  • self-oscillating

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  • Cite this

    Chou, Y. W., Chien, M. W., Chen, S. C., Chen, K-H., Lin, Y. H., Tsai, T. Y., Huang, C. C., Lee, C. C., Tai, Z. H., Cheng, Y. H., Tsai, C. C., Luo, H. Y., Wang, S. M., Chen, L. D., Yang, C. C., & Hui, H. T. (2014). A low THD clock-free Class-D audio amplifier with an increased damping resistor and cross offset cancellation technique. In 2014 IEEE International Symposium on Circuits and Systems, ISCAS 2014 (pp. 2680-2683). [6865725] (Proceedings - IEEE International Symposium on Circuits and Systems). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISCAS.2014.6865725