I am trying to calculate the value of R2 to achieve a DC voltage of 7V at vout, and I have derived an equation where R2 = 7V/Id7, however I am unsure how to find Id7 without knowing Vgs for Q7. (also Id7 = Is7).

Or am I going about this completely the wrong way and is there another way to solve R2?

Any help would be greatly appreciated.

 

So far so good....

What can you tell me about the relationship between the input signal +/-vid+cm and Vo2?