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differential FET cascode configuration - gain of this amp

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roberts26

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gain of this amp

Hi, Can anyone please tell me what is the gain of this circuit. It is a differential FET cascode configuration.

Please need your help a bit of explanation will be highly appreciated.

Regards
 

Re: gain of this amp

All of the output is fed back to the input via R7 so the gain is 1.
 

Re: gain of this amp

I think the gain is 1，because U1 amplify the difference of the outputs of the full-differential pairs，the stage combined by J2 and J3 has the same gain with the stage combined by J1 and J4，let's denotes the gain as -A1，the gain of u1 was expressed as -A2 which can be considered large enough.We can get:
Vo/Vi=A1A2/(A1A2-1)
 

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