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Question about distortion test circuit

Other Parts Discussed in Thread: OPA1652

Dear sir:

     I got question about the distortion gain calculation of Fig. 39 in opa1652 datasheet. I don't quite understand the noise gain calculation with R3 in between pos and neg input of OPAmp. Could somebody show me the equivalent circuit of it? Also, may I use the distortion gain equation for both inverting and non-inverting? And is the noise gain the same as distortion gain in this circuit?

 

Thanks!

Brian