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Analog Verification >> Analog Performance Verification >> Simulate slew rate of a fully differentiel amplifier
https://designers-guide.org/forum/YaBB.pl?num=1268342447

Message started by IvoryDesigner on Mar 11^th, 2010, 1:20pm

Title: Simulate slew rate of a fully differentiel amplifier
Post by IvoryDesigner on Mar 11^th, 2010, 1:20pm

Hi,
I'm simulating performances of a fully differential OpAmp, and I would like to know How to simulate the Slew rate. I know how to do it with a single ended OpAmp: Set the OpAmp into follower configuration and enter a pulse at the input and look at the output.

Is it the same with a fully differential OpAmp??

Thank you for your help! :)

Title: Re: Simulate slew rate of a fully differentiel amplifier
Post by sheldon on Mar 12^th, 2010, 10:14pm

Ivory,

Maybe I am missing something, but why don't you just measure
slew rate of the amplifier in the application test bench? That is, input
a pulse into your circuit and measure the slew rate. The slew rate is
dependent on context, that is, the circuit architecture.

Best Regards,

Sheldon

Title: Re: Simulate slew rate of a fully differentiel amplifier
Post by IvoryDesigner on Mar 13^th, 2010, 7:38pm

Hi Sheldon,

Thanks for your answer, that a good point :). I know I can measure the SR of the entire analog chain, but I also want to caracterise the intrinsic performance of the amplifier alone with the load.

Best Regards!!

IvoryDesigner

Title: Re: Simulate slew rate of a fully differentiel amplifier
Post by yvkrishna on Mar 15^th, 2010, 6:45am

Hi Ivory,
apply a differential step at the inputs(each of half the magnitude) and measure slew at the diffferential o/p.

Thanks,
yvkrishna

Title: Re: Simulate slew rate of a fully differentiel amplifier
Post by BackerShu on Jun 28^th, 2010, 6:52pm

Hi Ivory!

This post may give you some reference if you still need it.
http://www.edaboard.com/viewtopic.php?t=373921&sid=4673be3c19446c2a6615a6baa54041d0

By the way, I think sheldon's is much more proper to get the real SR spec of the OPAMP, since the exact environment of it can't be easily built, such as the C load, the influence of the clock signal if the circuit has one.