Re: [SI-LIST] : Jitter measurement

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From: Paul Levin (levinpa@earthlink.net)
Date: Mon Mar 19 2001 - 08:39:32 PST


Dear Sunil,

Better than either of these would be to get your hands on a good,
old-fashioned analog spectrum analyzer. Center your display on
the nominal frequency and then decrease your resolution bandwidth
(and everything that goes along with it) so that you can see the
detail in the first few KHz on either side of the center frequency.

You'll have to study up on jitter mathematics and dBc offsets, but
once you've got that straight, you can integrate the flanks of your
oscillator between any f1 and f2 and determine the likely jitter
arising from noise in that frequency range.

Paul Levin
Senior Principal Engineer
Logic Innovations
__________________

Sunil Kumar wrote:

> Hello everybody..
>
> I want to measure cycle-to-cycle jitter generated by a crystal
> oscillator. I have two options:
>
> 1) Real time oscilloscope
> 2) Sampling oscilloscope
>
> The bandwidth of the real time oscilloscope is enough for my
> measurements. Both the oscilloscopes are equipped with jitter
> measurement packages. Can anybody suggest which method is better?
> And why?
>
> Thanks a lot..
>
> Sunil Kumar
>
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