The Designer's Guide Community Forum https://designers-guide.org/forum/YaBB.pl 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 11th, 2010, 1:20pm

 Title: Simulate slew rate of a fully differentiel amplifier Post by IvoryDesigner on Mar 11th, 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 12th, 2010, 10:14pm Ivory,   Maybe I am missing something, but why don't you just measureslew rate of the amplifier in the application test bench? That is, inputa 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 13th, 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 15th, 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 28th, 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=4673be3c19446c2a6615a6baa54041d0By 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.