我希望用pwm滤波实现dac的功能。请问为什么我用4阶RC滤波之后，总会有如图所示的一个叠加噪声，怎么一直滤不掉。
我用的是msp430f5529，时钟频率设置25MHz，会不会是因为时钟的噪声干扰？
请问该如何才能去掉这种噪声呢？感谢解答。
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