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电子学报  2012 

微控制器PWM接口实现高分辨率D/A转换器方法研究

DOI: 10.3969/j.issn.0372-2112.2012.08.021, PP. 1631-1634

Keywords: 数模转换器,过采样技术,脉冲宽度调制,分辨率,微控制器

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Abstract:

本文针对嵌入式应用中PWM(Pulse-WidthModulation)方式DAC(Digital-to-AnalogConverter)和独立DAC芯片选择问题,提出了通过插值方式和多PWM组合方式提高PWM方式DAC分辨率的方法;分析了PWM信号频谱,提出了模拟滤波器设计原则与方法.以MCU(MicroControlUnit)的PWM通道方式实现DAC,经过数据分析证明此方法稳定可靠.

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