Say for argument's sake you have an output stage with lots of local feedback. Something like a cathode follower, Schade style feedback, or something fancy. It drives the load (the OPT primary) with a low output impedance.
Supposedly this will also give increased bandwidth through the output transformer thanks to the parasitics being swamped by the low impedance.
Now, what I'm having trouble with is the following:
I guess the gist of my question is: despite the fact that you can apply lots more LOCAL feedback, is it actually worth doing in the real world and is stabilized global feedback just as good?
Supposedly this will also give increased bandwidth through the output transformer thanks to the parasitics being swamped by the low impedance.
Now, what I'm having trouble with is the following:
- Is there a benefit to using loads of local feedback instead of the limited amount you can from the OPT's secondary?
- Is global feedback essentially just as good as long as you take the phase shift into account?
- Does global feedback straighten out the phase shift the same way local feedback would?
I guess the gist of my question is: despite the fact that you can apply lots more LOCAL feedback, is it actually worth doing in the real world and is stabilized global feedback just as good?