Integrated Pop-Click Noise Suppression, EMI Reduction, and Short-Circuit Detection for Class-D Audio Amplifiers

Jiang, Xicheng; Song, Jungwoo; Wang, Minsheng; Chen, Jianlong; Arunachalam, Sasi Kumar

doi:10.1109/jssc.2013.2238999

Cited by 12 publications

(2 citation statements)

References 13 publications

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“…Although for Class D audio amplifiers several new techniques like edge rate control (ERC) [8], new switching schemes as well as introducing spread spectrum techniques have led to a significant reduction of the electromagnetic emission, the electromagnetic compatibility (EMC) of Class D amplifiers is still one of the main concerns to design engineers [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Emission reduction in Class D audio amplifiers by optimizing spread spectrum modulation

Deutschmann

Winkler

Karaca

2015

2015 10th International Workshop on the Electromagnetic Compatibility of Integrated Circuits (EMC Compo)

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Due to their high efficiency compared to conventional Class AB amplifiers, Class D audio amplifiers have increasingly become the amplifier of choice especially for low power applications such as portable electronics. However, Class D amplifiers are still a major source of electromagnetic emission of the electronic applications in which they are used. In this paper the benefits of using spread spectrum techniques in order to reduce the emission of Class D audio amplifiers is highlighted. Based on IC-level measurement results of a 10W Mono Class D speaker amplifier, that allows to be synchronized to an external clock, it is shown how spread spectrum parameters like deviation, modulation frequency and modulation signal can be optimized in order to maximize the reduction of the emission.

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Section: Introductionmentioning

confidence: 99%

Emission reduction in Class D audio amplifiers by optimizing spread spectrum modulation

Deutschmann

Winkler

Karaca

2015

2015 10th International Workshop on the Electromagnetic Compatibility of Integrated Circuits (EMC Compo)

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“…The emission, or EMI, potentially affects sensitive circuits in the proximity, such as radio frequency low noise amplifiers. It is therefore important for filterless CDAs to limit their EMI emission to a sufficiently low level [21,24,69,78].…”

Section: Gnd Gndmentioning

confidence: 99%

Analysis and design of audio class D amplifiers

Guo¹

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A 0.02% THD and 80 dB PSRR filterless class D amplifier with direct lithium battery hookup in mobile application

Zheng

Zhu

2017

J. Semicond.

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This paper presents a fully integrated CMOS filterless class D amplifier that can directly hook up lithium battery in mobile application The proposed amplifier embodies a 2-order feedback path architecture instead of direct feedback of output to input of the integrator to decrease the high frequency intermodulation distortion associated with direct feedback and eliminate the integrator input common mode disturbance from the output in ternary modulation. The prototype class D amplifier realized in 0.35 μm digital technology achieves a THD+N of 0.02% when delivering 400 mW to an load from . The PSRR of the prototype class D amplifier is 80 dB at 217 Hz. Furthermore a filterless method that can eliminate the external LC filter is employed which offers great advantages of saving PCB space and lowering system cost. In addition the prototype class D amplifier can operate in large voltage range with VDD range from 2.5 to 4.2 V in mobile application. The total area of the amplifier is 1.7 mm2.

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Integrated Pop-Click Noise Suppression, EMI Reduction, and Short-Circuit Detection for Class-D Audio Amplifiers

Cited by 12 publications

References 13 publications

Emission reduction in Class D audio amplifiers by optimizing spread spectrum modulation

Emission reduction in Class D audio amplifiers by optimizing spread spectrum modulation

Analysis and design of audio class D amplifiers

A 0.02% THD and 80 dB PSRR filterless class D amplifier with direct lithium battery hookup in mobile application

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