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ADS1299共模抑制比

Other Parts Discussed in Thread: ADS1299

您好:
    我使用贵公司的ADS1299采集脑电,芯片资料上标明的共模抑制比CMRR为110dB,如此高的共模抑制比完全能够把共模信号衰减掉,但是我在实际测量中采集的脑电中还是有很强的共模50Hz干扰。请问下,这种情况要怎么解释呢?