feedback phase shift that lags Vin, so it must introduce a phase lead to zero the error. So it is the error amp in the main amp that introduces the lead and not the feedback path. So the idea is introduce a phase lag in the feedback to force the main amp to produce the compensating phase lead.
Quite often, the _theory_ isn't the actual answer ;-) ...Jim Thompson
Not as long as Bill Sloman is a member...
You'll get a kick out of this:
They did that already. Darn upstairs neighbours.... ;)
Cheers
Phil Hobbs
Sure did! At ~1min of crap delay, I exited the page. ...Jim Thompson
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It's a 1959 military book on Germanium transistor circuits.It took me about another five seconds, after a 57 second wait to download it.
The name of the manual is TM11-690, and it's availible on a lot of sites.
Got it. ...Jim Thompson
Got around to testing it, OpAmps are 10MHz GBW, Phase-Margin=45°...
Is it really worth the effort? ...Jim Thompson
Compound amps can be useful for frequency-domain applications, but their transient response is nearly always the pits. You wind up with some pole-zero pair someplace in the mid-frequencies that almost-but-not-quite cancel, and that produces settling artifacts at long times. If 1% settling is all you care about, you can do it, but
0.1% is hard and 0.01% is next to impossible IME.Cheers
Phil Hobbs
Yep. Looked to me like the phase "improvement" is nothing to write home about, and you pay dearly with peaking. ...Jim Thompson
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