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Class D amplifier power stage with PWM feedback loop

Lam, C.K.; Tan, M.T.; Cox, Stephen M.; Yeo, K.S.

Authors

C.K. Lam

M.T. Tan

Stephen M. Cox stephen.cox@nottingham.ac.uk

K.S. Yeo



Abstract

This paper presents a Second-Order Pulse Width Modulation (PWM) feedback loop to improve Power Supply Rejection (PSR) of any open-loop PWM Class-D amplifiers (CDAs). PSR of the audio amplifier has always been a key parameter in mobile phone applications. In contrast to Class AB amplifiers, the poor PSR performance has always been the major drawback for CDAs with half-bridge connected power stage. The proposed PWM feedback loop is fabricated using GLOBALFOUNDRIES' (GF’s) 0.18 µm CMOS process technology. The measured PSR is more than 80 dB and the measured Total Harmonic Distortion (THD) is less than 0.04% with a 1 kHz input sinusoidal test tone.

Journal Article Type Article
Journal IEEE Transactions on Power Electronics
Print ISSN 0885-8993
Electronic ISSN 0885-8993
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 28
Issue 8
APA6 Citation Lam, C., Tan, M., Cox, S. M., & Yeo, K. Class D amplifier power stage with PWM feedback loop. IEEE Transactions on Power Electronics, 28(8), doi:10.1109/TPEL.2012.2230027
DOI https://doi.org/10.1109/TPEL.2012.2230027
Publisher URL http://dx.doi.org/10.1109/TPEL.2012.2230027
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information (c) 2013 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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