vivkr wrote on Jun 21st, 2011, 12:08am:Rob,
Indeed, the most popular variant of this scheme is to return the feedback to the cascode. However, as you point out, that causes peaking. My experience was that this peaking makes life quite painful, so much so that you do not really reap the full benefits of using this scheme. It turns out to be better to just put the extra stage although you end up burning more power and adding an extra source of noise to your amp.
Vivek
What kind of amps are you building? It usually isn't a problem for me unless I'm driving a large DC current.