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opa695平衡电阻问题

Other Parts Discussed in Thread: OPA695

我做了一个OPA695的反向放大,同相端没有加20欧的电阻到地,一上电正向后正电压先是被拉低到零点几伏,然后芯片冒烟了,我断电后检查电路最终确定是没加20欧电阻的问题,后来加上这个电阻后芯片仍然可以放大,但是看了芯片手册也没有说为什么要加这个电阻,希望大家能帮忙解决一下这个问题。