Bang-Bang Control Class D Amplifiers: Total Harmonic Distortion and Supply Noise
Bang-Bang Control Class D Amplifiers: Total Harmonic Distortion and Supply Noise
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Bang-Bang 控制 D 类放大器：总谐波失真和电源噪声
DOI：
10.1109/tcsi.2008.2012203
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
J. Chang
中科院分区：
文献类型：
--
作者：
T. Ge;J. Chang
总谐波失真（THD）和电源噪声（由电源抑制比（PSRR）和电源诱导互调失真（PS-IMD）决定）被认为是D类放大器的潜在缺陷。本文推导了砰砰控制D类放大器（砰砰放大器）的THD、PSRR和PS-IMD的解析表达式；bang-bang放大器可以说是最节能的D类放大器，适用于包括助听器在内的低压功率关键应用。基于导出的表达式，研究了重要参数对砰砰放大器的THD、PSRR和PS-IMD的影响，为砰砰放大器满足给定设计规范的设计提供了良好的见解。通过与HSPICE仿真和硬件测量进行比较，验证了分析结果。bang-bang放大器还与流行的脉宽调制D类放大器进行了比较，在大多数情况下，前者被证明具有更优越的参数，包括更低的功耗和硬件优势，适用于低压功率关键型应用。
The total harmonic distortion (THD) and the power supply noise, qualified by the power supply rejection ratio (PSRR) and by the power supply induced intermodulation distortion (PS-IMD), are recognized to be potential drawbacks of class D amplifiers. In this paper, analytical expressions for the THD, PSRR, and PS-IMD of the bang-bang control class D amplifier (bang-bang amp) are derived; the bang-bang amp is arguably the most power-efficient class D amp for low-voltage power-critical applications including hearing aids. Based on the derived expressions, the effects of important parameters on the THD, PSRR, and PS-IMD are investigated, providing good insight to the design of the bang-bang amp to meet given design specifications. The analytical analyses are verified by comparing them against HSPICE simulations and hardware measurements. The bang-bang amp is also compared against the prevalent pulsewidth modulation class D amp, and in most cases, the former is shown to possess superior parameters, including lower power dissipation and hardware advantages for low-voltage power-critical applications.