Hi
You also have a lot of devices being characterized in terms of "added
jitter" doing exactly the same sort of stuff.
Bob
--------------------------------------------------
From: <saidj...@aol.com>
Sent: Sunday, August 15, 2010 11:31 PM
To: <time-nuts@febo.com>
Subject: Re: [time-nuts] Low jitter oscillators
Hi Bob,
Agreed that at a minimum the instrument will restrict the bandwidth due
to
it's own bandwidth limitations, and some (like the Wavecrest units) go up
to 1GHz or more.
But many vendors claim sub 1ps jitter on low cost oscillators, and don't
specify what bandwidth was used to measure this jitter. That would be like
giving phase noise in dBc without also specifying the /Hz, and then every
vendor using their own internal bandwidth definitions to make their phase
noise claims..
Sometimes I think vendors assume that E5052A units are being used
everywhere to measure jitter.
bye,
Said
In a message dated 8/15/2010 17:34:09 Pacific Daylight Time, li...@rtty.us
writes:
Hi
The bandwidths chosen generally have roots in a telcom spec. Infinite
bandwidth generally equates to infinite jitter. You have to restrict it
somehow.
Bob
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