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ADS1291: 请问在心电测量中这四个10M欧姆电阻的作用是什么呢

Part Number: ADS1291

 图中R3、R4以及R5、R6的作用是什么呢,在我看来是将IN1P/N的电压拉升到(AVDD+AVSS)/2,那么这么做是为什么呢?请指教。