Re: [SI-LIST] : Question to Jitter

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From: Neeraj Sharma ([email protected])
Date: Wed Apr 11 2001 - 05:01:16 PDT

Hello Kai,

Cycle to cycle jitter is the variation in the clock transition from the
corresponding transition in the previous cycle.

Another jitter definition is the periodic jitter (or the short term jitter)
that measures the maximum variation in clock transitions from ideal
position. The variations can be leading or lagging from the ideal position.

Long term jitter is the maximum change in the clock transition from ideal
position over many clock cycles. (normally can be measured using delayed
time base on the oscilloscopes). This is closest to be called the peak to
peak jitter.

More cycle to cycle jitter can add to the measured peak to peak jitter
values over a period of time. From a system point of view cycle to cycle
jitter can cause more harm. Setup and hold time failures are primarily
caused by clock period differences between the consecutive cycles rather
than the clock variations from an "ideal" clock.

Following article from Cypress and page at the Lecroy website can be of

Jitter in PLL-Based Systems: Causes, Effects, and Solutions

Introduction to Jitter and Timing Analysis


This is an email from :
Neeraj Sharma
Senior Engineer - VLSI/System Design
Wipro Technologies
#72, "Keonics Electronics City"
Bangalore - 561229 India
Phone : +91-80-8520 408 ext 4163, 4164
Email : [email protected]
Web :

----- Original Message -----
From: Kai Peters <[email protected]>
To: si-list <[email protected]>
Sent: Wednesday, April 11, 2001 3:34 PM
Subject: [SI-LIST] : Question to Jitter

Dear Si-list members,

I'm looking for references of jitter-definitions possibly covering questions
is there any relation of cycle-to-cycle- to peak-to-peak-jitter ?
P-t-P jitter could be the measured value for both random and deterministic
jitter, but where does
cycle-to-cycle belong to ?

Any hints will be appreciated



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