Effect of carrier topologies on PSRR and PS-IMD of open-loop Class D amplifiers for hearing aids

Linfei Guo, T. Ge, J. Chang
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引用次数: 1

Abstract

Open-Loop Pulse Width Modulation (PWM) Class D amplifiers are attractive for power critical applications including hearing aids due to their simple hardware and high power-efficiency. Nevertheless, a drawback of open-loop Class D amplifiers is their susceptibility to supply noise, quantified by power supply rejection ratio (PSRR) and power supply induced intermodulation distortion (PS-IMD). In this paper, PSRR and PS-IMD of a commonly-used carrier generation method are investigated and compared against other common carrier generation methods. The analyses are verified by means of HSPICE simulations. The analyses and comparisons provide designers useful insight to the design of power critical Class D amplifiers.
载波拓扑结构对助听器开环D类放大器PSRR和PS-IMD的影响
开环脉宽调制(PWM) D类放大器由于其简单的硬件和高功率效率,对于包括助听器在内的功率关键应用具有吸引力。然而,开环D类放大器的一个缺点是它们容易受到电源噪声的影响,这可以通过电源抑制比(PSRR)和电源诱导互调失真(PS-IMD)来量化。本文研究了一种常用载波生成方法的PSRR和PS-IMD,并与其他常用载波生成方法进行了比较。通过HSPICE仿真验证了分析结果。这些分析和比较为设计人员设计功率关键型D类放大器提供了有用的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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