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OPA344 放大倍数的疑问

Other Parts Discussed in Thread: OPA344, OPA345

 R91 = 200k

R92 = 10K

这样计算的放大倍数是21倍

但是输入一个8mV的电压,理论应该输出168mV;但是实际测试并没有放大,输出也是8mV左右

请问是否我对opa344的理解有误?用法不对?

谢谢