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**Hi All,**

My first post in the forums, hopefully I'll be able to give out as much help as I receive. I'm currently stuck on an Op Amp gain derivation.

Attached is the question and diagram, the derivation I am struggling with is part B.

I understand the gain for this Op Amp were it ideal would be 1+ Rf/R1 but I cannot seem to derive the equation if the input resistance is not ideal.

Thanks in advance,

George

My first post in the forums, hopefully I'll be able to give out as much help as I receive. I'm currently stuck on an Op Amp gain derivation.

Attached is the question and diagram, the derivation I am struggling with is part B.

I understand the gain for this Op Amp were it ideal would be 1+ Rf/R1 but I cannot seem to derive the equation if the input resistance is not ideal.

Thanks in advance,

George

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