The Designer's Guide Community Forum - Simulate slew rate of a fully differentiel amplifier

New Member

Offline

Posts: 5

Simulate slew rate of a fully differentiel amplifier
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!

Back to top

IP Logged

sheldon Community Fellow Offline Posts: 485	Re: Simulate slew rate of a fully differentiel amplifier Reply #1 - 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
Back to top	IP Logged

IvoryDesigner New Member Offline Posts: 5	Re: Simulate slew rate of a fully differentiel amplifier Reply #2 - 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
Back to top	IP Logged

yvkrishna Community Member Offline Posts: 42	Re: Simulate slew rate of a fully differentiel amplifier Reply #3 - 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
Back to top	IP Logged

BackerShu

Junior Member

Offline

Posts: 14

Re: Simulate slew rate of a fully differentiel amplifier
Reply #4 - 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=4673be3c19446c2a6615a6baa5404...

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.

Back to top

Thanks and Regards!
BackerShu

IP Logged