Part Number: OPA891
I have a 0~20mV differential signal ,input common-mode voltage is 12V，signal bandwidth is 10MHz。target Gain is 25V/V，output common-mode voltage is 0V。
I select three OPA891 form an instrument amp as the schematic below。
In the first stage，choose Rf=7Rg，let G1=15。bcause GBW of OPA891 is 180MHz，signal bandwidth is 10MHz，let -3dB Gain above 10MHz.
In the second stage：choose 25*R1=15*R2，ie G2 is about=1.667，let G=G1*G2=25
please give me some .advice on my design。
