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您好，
您所选通道PGA gain设置的是多少，PGA Gain与信号带宽有关系，见数据手册Table 4. PGA Gain versus Bandwidth，它至少应该是64kHz，否则会失掉pace signal
可参考TIPD111：Hardware Pace Detection for ECG Reference Design www.ti.com/.../TIPD111
