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关于差分电路电阻的选择

Other Parts Discussed in Thread: OPA180

TI工程师你好!

我目前打算使用OPA180运放构建差分放大器。如下图所示

如果我的放大倍数取0.4,那么取R1=R2=300K,RF=RG=120K,和R1=R2=30K,RF=RG=12K这两个选取哪一组比较好。或者有什么方法可以用来确定这四个电阻的大小。谢谢!