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http://dx.doi.org/10.9717/kmms.2018.21.9.1068

Method for Current-Driving of the Loudspeakers with Class D Audio Power Amplifiers Using Input Signal Pre-Compensation  

Eun, Changsoo (Department of Radio and Information Communications Eng. Chungnam National University)
Lee, Yu-chil (Kaidas Co., Ltd.)
Publication Information
Journal of Korea Multimedia Society / v.21, no.9, 2018 , pp. 1068-1075 More about this Journal
Abstract
We propose a method for driving loudspeakers from class D audio power amplifiers in current mode, instead of in conventional voltage mode, which was impossible with the feedback circuitry. Unlike analog audio amplifiers, Class D audio power amplifiers have signal delay between the input and output signals, which makes it difficult to apply the feedback circuitry for current-mode driving. The idea of the pre-distortion scheme used for the compensation of the non-linearity of RF power amplifiers is adapted to remedy the impedance variation effect of the loudspeakers for current driving. The method uses the speaker model for the pre-distorter to compensate for the speaker impedance variation with frequency. The simulation and test results confirms the validity of the proposed method.
Keywords
Audio Power Amplifier; Voltage-Drive Mode; Current-Drive Mode; Loudspeaker Impedance Variation; Class D Amplifier; Pre-Distortion;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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