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见图，很奇怪的噪声，成阶梯形。采集的是一个1HZ的正弦信号，如果采1K的信号这个噪声九没有了。
如果方便，请上传一下电路图以便分析。谢谢！
问题可能出在，ADC模拟输入部分，受到了干扰。
对比一下信号源和你采样后的频谱
