Re: gEDA-user: opamp slew rate limiting

[Dan McMahill <dan@xxxxxxxxxxxx>]

carzrgr8@xxxxxxxxxxxxx wrote:
> I have a problem with an opamp at work and was hoping someone may have some insight.

> I've gone as far as removing all loads from the opa2132, and it doesn't change the slew rate.  The data sheet has a drawing with 'large signal step response', and it shows the part slewing around 15 or 20V in 1 uS.  Not bad.  So what have I done wrong?  They do claim it's with a gain of -1, but I don't see how that has anything to do with it.

have you tried driving it with a lower amplitude (low enough to not 
saturate the outputs) square wave and verifying that you reach the 20 
V/us slew rate then?

If it were me, I'd step back and make sure that nothing is goofed up 
with the measurement (try measuring a square wave from a pulse generator 
and making sure you don't have any speed issues there).  Then I'd make 
sure that I could see a 20V/us slew rate with a square wave signal that 
is small enough to not saturate the amplifier.

-Dan



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