Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/95858
Title: A dual-feedforward carrier-modulated second-order class-D amplifier with improved THD
Authors: Yu, Jun
Tan, Meng Tong
Goh, Wang Ling
Cox, Stephen Michael
Keywords: DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2011
Source: Yu, J., Tan, M. T., Goh, W. L., & Cox, S. M. (2011). A dual-feedforward carrier-modulated second-order class-D amplifier with improved THD. IEEE transactions on circuits and systems II : express briefs, 59(1), 35 - 39.
Series/Report no.: IEEE transactions on circuits and systems II : express briefs
Abstract: The advancement of power MOSFET fabrication technology has aided the reduction of power stage errors in class-D amplifiers (amps). This reduction reveals intrinsic distortion, which is a key performance limiter in modern pulsewidth-modulation (PWM)-based class-D amps. In this brief, a dual-feedforward carrier modulation topology is proposed to reduce the intrinsic harmonic distortion of a second-order loop filter class-D amp. The proposed design achieves a total harmonic distortion of less than 0.01% for input frequency up to 6 kHz, and it has an idle carrier frequency of 310 kHz. Such low carrier frequency is particularly important in high-power devices as it guarantees low switching loss. Moreover, the carrier frequency varies in a narrow range in the presence of an input signal and helps to suppress the audible intermodulation distortion in multichannel applications. The prototype circuit is implemented and tested on a printed circuit board using discrete components.
URI: https://hdl.handle.net/10356/95858
http://hdl.handle.net/10220/11468
DOI: 10.1109/TCSII.2011.2173973
Rights: © 2011 IEEE.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:EEE Journal Articles

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