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观看TI精密实验室视频中对一个公式有些不解

Other Parts Discussed in Thread: OPA211, OPA188

 第二章运放输入失调电压电流对输出产生的影响实验。实验用的是opa211和opa188.

其中在计算时有个公式 Req = RfR1 / Rf+R1 

Req = 1K

理解不了这个Req是怎么计算来的?Rf和R1分别为多少?

为什么计算出来是1K???

谢谢大家了,才开始用不知道这么粘贴图片,希望理解