Visualization of intrinsic harmonic distortion for closed-loop Class D amplifier

2011 ◽  
Author(s):  
Jun Yu ◽  
Wang Ling Goh ◽  
Meng Tong Tan
Keyword(s):  
Closed Loop ◽  
Harmonic Distortion ◽  
Class D Amplifier ◽  
Class D

scholarly journals A 40-nm CMOS, 1.1-V, 101-dB Dynamic-Range, 1.7-mW Continuous-Time $\Sigma\Delta$ ADC for a Digital Closed-Loop Class-D Amplifier

2015 ◽  
Vol 62 (3) ◽  
pp. 645-653 ◽  
Author(s):  
Achille Donida ◽  
Remy Cellier ◽  
Angelo Nagari ◽  
Piero Malcovati ◽  
Andrea Baschirotto
Keyword(s):  
Continuous Time ◽  
Closed Loop ◽  
Dynamic Range ◽  
Sigma Delta ◽  
Class D Amplifier ◽  
Class D

Study of Harmonic Suppression Method Based on the Class D Amplifier

2013 ◽  
Vol 273 ◽  
pp. 384-388
Author(s):  
Yu Guo ◽  
Wei Li
Keyword(s):  
Power Amplifier ◽  
Integrated Circuit ◽  
High Efficiency ◽  
Harmonic Distortion ◽  
Harmonic Suppression ◽  
Output Terminal ◽  
Class D Amplifier ◽  
Class D ◽  
Small Distortion ◽  
Harmonic Components

Class D power amplifier has the advantages of simple structure, small volume, high efficiency, large output power, and small distortion, therefore is applied widely in the audio power amplifier integrated circuit. But because of existing higher harmonic components, the total harmonic distortion (THD) is high. In this paper, for the characteristics of class D amplifier, a feed-forward control circuit is added to the amplifier output terminal, and a composite filter is used to inhibit output harmonics further. The simulation results show that, the method can reduce the system THD effectively and improve the performance of the amplifier.

scholarly journals A Fixed-Frequency Sliding-Mode Controller for Fourth-Order Class-D Amplifier

Electronics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 261 ◽  
Author(s):  
Haider Zaman ◽  
Xiancheng Zheng ◽  
Xiaohua Wu ◽  
Shahbaz Khan ◽  
Husan Ali
Keyword(s):  
Fourth Order ◽  
Sliding Mode ◽  
Cutoff Frequency ◽  
Harmonic Distortion ◽  
Fixed Frequency ◽  
Current Feedback ◽  
Integral Sliding Mode ◽  
Class D Amplifier ◽  
Class D ◽  
Lc Filter

Since the parasitic voltage ringing and switching power losses limit the operation of active devices at elevated frequencies; therefore, a higher‐order inductor‐capacitor (LC) filter is commonly used, which offers extended attenuation above the cutoff frequency and thus, improves the total harmonic distortion (THD) of the amplifier. This paper applies the concept of integral sliding‐mode control to a fourth‐order class‐D amplifier. Two fixed‐frequency double integral sliding‐mode (FFDISM) controllers are proposed, where one uses the inductor current while the other involves the capacitor current feedback. Their equivalent control equations are derived, but from the realization viewpoint, the controller using the capacitor current feedback is advantageous and, therefore, is selected for final implementation. The performance of the proposed FFDISM controller for fourth‐order GaN class‐D amplifier is confirmed using simulation and experimental results.

Closed-Loop Class-D Amplifier With Nonlinear Loop Integrators

2010 ◽  
Vol 45 (7) ◽  
pp. 1389-1398 ◽  
Author(s):  
Benno Krabbenborg ◽  
Marco Berkhout
Keyword(s):  
Closed Loop ◽  
Class D Amplifier ◽  
Class D
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