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关于 opa691ID 芯片 datasheet中一个电路图

Other Parts Discussed in Thread: OPA691

您好  请问关于这个放大放大电路中 我用黑笔圈出的部分 为什么要用负电源连接Rf 和Rg 这两个402Ω的电阻呢?谢谢回答