Understanding and Measuring Jitter

This demo from NIWeek 2012 shows how users can develop hardware-agnostic jitter analysis code, create custom jitter, level, and timing measurements using the flexible API. It also presents how to visualize signals using color-graded persistence eye diagrams, mask limit testing, and bathtub plots.

Transcript

00:00:01 hi my name is Jordan dolman I'm the product marketing manager for National instruments digitizers nillos scope cards and today I'm going to be talking to you about uh Jitter measurements using the new lab view Jitter analysis toolkit okay so what we're doing here uh is actually generating a a simulated Digital Signal using the Jitter analysis toolkit uh and then using uh more of the

00:00:23 vi in the toolkit in order to analyze the signal so you can see here a nice perfect square wave uh and then an eye diag with absolutely no Jitter just perfect edges uh and so using the toolkit we're going to introduce a random Jitter uh which you can see is now represented down here in this histogram uh as well as a widening of the um of the transition area in the eye

00:00:46 diagram uh and then certainly reflected in the in the bathtub plot down below uh we can remove that random Jitter uh and then swap it out for some deterministic Jitter uh in this case it's actually uh sinusoidal Jitter uh that we uh we're generating here deterministic once again um increasing the the width of the transition area for the I diagram uh and and we can actually go ahead and one by

00:01:10 one add in uh the random Jitter components and then uh inner symbol interference and duty cycle Distortion uh which actually you you'll only see see this if we if we change from a square wave over to a data signal that has uh uh different types of transitions rather than back and forth uh between ones and zeros and and so the idea here is that you can not only use the lab

00:01:32 view Jitter analysis toolkit in order to analyze uh and and understand and hopefully remove Jitter from your your signals um but you can also generate a signal using the toolkit in order to validate that all of your measurements are set up correctly and uh and this Jitter analysis toolkit is uh compatible with not only ni digitizers uh but any type of uh oscilloscope or digitizer

00:01:53 products on the market uh so it's a really unique uh and flexible API uh that we've added to the lab view platform and that's about it for the demo thank you so much for your time