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求指导，本人买的ADS1299评估板，在做测试的时候，用信号发生器加上正选信号，噪声很大，
这是哪里的波形？
这是在正常输入下加上正弦波的输出信号。我用示波器看了，信号发生器的输入正常，但是一旦加到INP和INAN两端噪声就很大，不知道是我设置的问题还是demo板子有问题
