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From: "PCS Electronics"
Subject: Re: Low jitter xtal oscilliator
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Thu, 21 Nov 2002 13:16:56 +0100
NNTP-Posting-Date: Thu, 21 Nov 2002 13:17:05 MET
Organization: Slovenija OnLine - SiOL
Check the arrl handbook, if my memory serves me right
there was a design for a low-jitter oscilator.
Marko - PCS Electronics
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"Martin Griffith" wrote in message
> On 20 Nov 2002 16:10:48 -0800, firstname.lastname@example.org (Tom Bruhns) scribbled:
> >To start with, you could do better than the 74HCU04 output buffer.
> >I think the bypassing is a bit silly. What's required here is
> >rejection of noise on the power supply lines (coming in) and you don't
> >need all that bypassing to do that. There are more efficient ways.
> I was going to use a separate LM317 for the crystal supply, I thought
> that stepped C array was a bit of "audiophile bullshit"
> >What is the claimed phase noise performance? Is it as good as you can
> >do with a good commercial "can"?
> The article did not provide any specifications, that why I posted the
> question, does it look a reasonable circuit in the first place, being
> not very knowledgeable about crystal oscillators
> I've just been looking at the CMAC site, they didnt supply any jitter
> info on the data sheets :(
> >Beware of what noise on the power supply will do to the phase noise.
> >Have you determined what phase noise (or jitter) is required for your
> >application? Will this circuit meet that need? Will a simpler
> >circuit meet that need?
> An old AES paper shows this graph, this was when 16bit ADC/DACs were
> the norm
> so better than this, some guys are saying that 9pS jitter is too much
> these days, with 24bit converters being standard issue
> >What other needs do you have? Will you need to distribute the same
> >clock to multiple users, or is it used only one place?
> yes, to maximum of 4 devices, and a divide by 256 for a wordclock
> >Martin Griffith wrote in message
> >> Any suggestions/comments on this circuit as digital audio master
> >> oscillator?
> >> http://martingriffith.users.btopenworld.com/OSCSPDIF.GIF
> >> Martin
> >> Warning: Tolkien is hobbit forming
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> 15 year-old Electric Guitar Player with Nirvana fixation: 100 feet
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