Class D amplifier power stage with PWM feedback loop

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Lam, C.K., Tan, M.T., Cox, Stephen M. and Yeo, K.S. (2013) Class D amplifier power stage with PWM feedback loop. IEEE Transactions on Power Electronics, 28 (8). pp. 3870-3881. ISSN 0885-8993

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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.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/1004704
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.
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Mathematical Sciences
Identification Number: 10.1109/TPEL.2012.2230027
Depositing User: Cox, Stephen
Date Deposited: 09 Feb 2013 16:43
Last Modified: 04 May 2020 20:20
URI: https://eprints.nottingham.ac.uk/id/eprint/1885

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