|
Penthode,
I used to think that changing the gain of a particular stage in the IF would affect frequency response, but I'm not sure that's the case. If you simply think of each of the tuned circuits as independent filters, and each of the amplifiers as linear wideband amplifiers, the frequency response and gain end up being completely independent, I believe. You can put all the gain up front, at the end, or interspersed however you like. The amplifiers, of course, also serve to buffer the filters from one another so that the tuning of one doesn't affect the neighbors, so you can't really put all the gain up front, but for illustration purposes, I believe it's correct.
|