一种基于左生长双边缘脉宽调制的无滤波器数字音频d类放大器

2017 2nd IEEE International Conference on Integrated Circuits and Microsystems (ICICM) Pub Date : 2017-11-01 DOI:10.1109/ICAM.2017.8242175

Xiaolei Chen, Haipeng Qu, Zeqi Yu, Chunyang Zhang, Enguang Zhang

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引用次数: 4

摘要

提出了一种基于左生长双边缘脉宽调制(PWM)的无滤波器数字音频d类放大器。它由一个高性能全数字均匀采样PWM (UPWM)调制器和一个桥系负载(BTL)功率级组成。由于采用了三进制PWM调制方案，使得无需LC低通滤波器的无滤波器解决方案成为可能。最后，对BTL功率级的误差进行了适当的修正，使该放大器系统具有较高的电源抑制比(PSRR)和高信噪比(SNR)。整个设计结合5V 0.35 μm CMOS工艺技术，在Matlab和Cadence平台上实现。

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A filterless digital audio class-D amplifier based on grow-left double-edge pulse width modulation

A filterless digital audio class-D amplifier (CDA) based on grow-Left double-edge (GLDE) pulse width modulation (PWM) is proposed in this paper. It consists of a high performance fully-digital uniform-sampling PWM (UPWM) modulator and a bridge-tied-load (BTL) power stage. Due to adopt the ternary PWM modulation scheme, the filterless solution without LC low-pass filter becomes possible. Finally, the error of the BTL power stage is properly corrected to make this amplifier system have a high power supply rejection ratio (PSRR) and a high signal to noise ratio (SNR). The whole design is implemented on Matlab and Cadence platform, combining with 5V 0.35-μm CMOS process technology.

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2017 2nd IEEE International Conference on Integrated Circuits and Microsystems (ICICM)

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