On Fri, 23 Feb 2018 18:48:24 -0000
"David C. Partridge" <[email protected]> wrote:
> Looking your schematic, I see that you are using LT1225 for both U2 (U111)
> and U3 (U112)
>
> Why did you use those rather than LM6361 and AD848? Was it just because
> LTSpice didn't have models for them? It can make a difference ...
Yes. LTSpice doesn't have an LM6361 or AD848. Linear lists the LT1225
as replacement for LM6361, so I thought this was safe. I deemed the AD848
to be close enough.
But as Bruce mentioned, the LT1225 is not unity gain stable, while the
LM6361 is. That might explain the oscillations.
> BTW LM6361 is 550V/mv not .55V (I assume that was a mistake in your post) ...
> Slew rates seem a bit different at +/- 15V supply as well.
The datasheet I have found (Natsemi Sept 1995) lists 550 V/V = 0.55 V/mV.
Which I think is a bit low, but then, the opamp is old.
Attila Kinali
--
It is upon moral qualities that a society is ultimately founded. All
the prosperity and technological sophistication in the world is of no
use without that foundation.
-- Miss Matheson, The Diamond Age, Neil Stephenson
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