克服移动设备中d类音频放大器限制的电路技术

2012 Symposium on VLSI Circuits (VLSIC) Pub Date : 2012-06-13 DOI:10.1109/VLSIC.2012.6243768

Xicheng Jiang, Jungwoo Song, Minsheng Wang, Jianlong Chen, S. Arunachalam, T. Brooks

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引用次数: 3

摘要

电路技术克服实际噪声，可靠性，和EMI限制的报告。带有斜坡电路的辅助环路将弹出和点击噪声抑制到1 mV，可实现输出电压为4V的放大器。交换边缘速率控制使系统能够满足EN55022 b类标准，裕度为15 dB。增强方案检测短路条件，而不依赖于超过限制的电流事件。

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Circuit techniques to overcome Class-D audio amplifier limitations in mobile devices

Circuit techniques to overcome practical noise, reliability, and EMI limitations are reported. An auxiliary loop with ramping circuits suppresses pop-and-click noise to 1 mV for an amplifier with 4V achievable output voltage. Switching edge rate control enables the system to meet the EN55022 Class-B standard with a 15 dB margin. An enhanced scheme detects short-circuit conditions without relying on over-limit current events.

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来源期刊

2012 Symposium on VLSI Circuits (VLSIC)

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