用于数字音频d类放大器的带UPWM量化器的Delta-Sigma调制器

2019 MIXDES - 26th International Conference "Mixed Design of Integrated Circuits and Systems" Pub Date : 2019-06-01 DOI:10.23919/MIXDES.2019.8787135

Chien-Hung Kuo, Y. Liou

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引用次数: 1

摘要

本文介绍了一种用于数字音频d类功率放大器的具有均匀脉宽调制(UPWM)量化器的δ - σ调制器。为了稳定UPWM调制器并提高其性能，提出了一种反切比雪夫滤波器的移极方法。为了降低d类放大器在脉冲密度调制(PDM)情况下的输出开关率和功率损耗，研究了UPWM量化器的锯齿载波特性。采用改进锯齿载波的单回路六阶UPWM调制器，在满量程信号输入下，在20 khz带宽内可实现120 dB的信噪比。采用所提出的方案，数字d类放大器的传输效率也可达到最高的1。

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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A Delta-Sigma Modulator with UPWM Quantizer for Digital Audio Class-D Amplifier

In this paper, a delta-sigma modulator (DSM) with uniform pulse-width modulation (UPWM) quantizer for digital audio class-D power amplifier is presented. A pole-moving approach for Inverse Chebyshev filters is proposed to stabilize the UPWM modulator as well as improve its performance. The characteristics of the saw-tooth carrier for UPWM quantizer is explored to reduce the output switching rate and the power loss in class-D amplifier in the pulse-density modulation (PDM) case. In the presented single-loop sixth-order UPWM modulator with the ameliorated saw-tooth carrier, an SNDR of 120 dB within 20-kHz bandwidth can be achieved under full-scale signal input. With the proposed schemes, the highest transfer efficiency of 1 for digital class-D amplifier can also be obtained.

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来源期刊

2019 MIXDES - 26th International Conference "Mixed Design of Integrated Circuits and Systems"

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