Re: [SI-LIST] : Jitter measurement

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From: Mike Jenkins (jenkins@lsil.com)
Date: Mon Mar 19 2001 - 18:24:00 PST


Paul, Sunil,

Using a spectrum analyzer to measure jitter assumes that there is
negligible variation in amplitude of the signal. I think this can
be a very tough assumption to make valid.

Regards,
Mike

Paul Levin wrote:
>
> 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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