[sdiy] Query about best cap type for '2164 stability network

[Neil Johnson]

Hi,

David G Dixon wrote:
> What I'd like to know is what this capacitor is actually doing, or under
> exactly what circumstances it does anything at all.

To understand what the RC circuit is doing you first need to understand:
1/ what the difference is between ground and virtual ground (they're
not the same)
2/ what an op-amp's dominant pole is (that's the problem we're trying to fix)
3/ datasheets are marketing documents, so whatever is in them is there
to show off the product in the best way possible, not to trick you

If you could list some of the electronics text books you have then we
might be able to point you in the right direction.
I would recommend Franco's book on opamps:
https://www.amazon.com/Design-Operational-Amplifiers-Integrated-Circuits/dp/0072320842

I think for values of source resistance greater than 30k you can stick
with the values per the datasheet.  It is only when the input
resistance goes below 30k that you need to rejig the compensator as
you start pushing the input stage harder with more current and so
compensation becomes more critical.

Cheers,
Neil
-- 
http://www.njohnson.co.uk