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INA333在ECG中应用的疑惑

Other Parts Discussed in Thread: INA333, ADS1298, OPA2333

各位老师好:

我使用INA333做ECG的第一级放大,想做个右腿驱动电路,但是根据手册P14 Figure36  右腿驱动的输入端是从Rg端引出的,而在Figuer37中,是从R6 R7 R8之间引出的,应该怎么分析?

还有,请问老师,右腿驱动单单是提高共模抑制么?