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Title: Time-domain analysis of intermodulation distortion of closed-loop class-D amplifiers
Authors: Yu, Jun
Tan, Meng Tong
Cox, Stephen Michael
Goh, Wang Ling
Keywords: DRNTU::Engineering::Electrical and electronic engineering
Issue Date: 2011
Source: Yu, J., Tan, M. T., Cox, S. M., & Goh, W. L. (2011). Time-Domain Analysis of Intermodulation Distortion of Closed-Loop Class-D Amplifiers. IEEE Transactions on Power Electronics, 27(5), 2453-2461.
Series/Report no.: IEEE transactions on power electronics
Abstract: This paper presents a time-domain analysis of the intermodulation distortion (IMD) of a closed-loop Class-D amplifier (amp) with either first- or second-order loop filter. The derived expression for the IMD indicates that there exist significant third-order intermodulation products (3rd-IMPs) within the output spectrum, which may lead to even greater distortion than the intrinsic harmonic components. In addition, the output expressions are compact, precise, and suitable for hand calculation so that the parametric relationships between the IMD and the magnitude and frequency of the input signals, as well as the effect of the loop filter design are straightforwardly investigated. In order to accurately represent the IMD performance of class-D amp, a modified testing setup is introduced to account for the dominantly large 3rd-IMPs when the International Telecommunication Union Radiocommunication Sector (ITU-R) standard is applied.
ISSN: 0885-8993
DOI: 10.1109/TPEL.2011.2171196
Rights: © 2011 IEEE
Fulltext Permission: none
Fulltext Availability: No Fulltext
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