aaron_do
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Hi,
I've gone over the equation in my head - I don't have a pen and paper with me - and it looks correct. Take note of the sentence "assuming Rin = Rs". Use that to calculate Rin, and Rout, and you will be able to rearrange Rout to get equation 2.9. Also for your intuitive comments, point (1) is correct, but in equation 2.9, (1+gm2Rs) is not the loop gain. Your answer is probably correct, but its just not in the correct form. (1 + gm2Rs) will increase Rout as long as Rs is large and as long as Rin is equal to Rs...
cheers, Aaron
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