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Old 20th May 2010, 01:26 AM   #1
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Default Is this cristal clock schematic would have a low jitter ?

Hello

Is this cristal clock schematic would have a low jitter ?

Do it need improvements ?

Thank you

Bye

Gaetan
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File Type: gif Crystal clock.gif (23.9 KB, 456 views)
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Old 20th May 2010, 03:41 AM   #2
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The colpitts would be better with a FET, and use a comparator instead of the inverter. There are ready schematics around.
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Old 20th May 2010, 04:58 AM   #3
EUVL is offline EUVL  Europe
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Check this out :

http://www.bgaudioclub.org/uploads/d...er_Matthys.pdf


Patrick
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Old 20th May 2010, 05:01 AM   #4
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Quote:
Originally Posted by Bernhard View Post
The colpitts would be better with a FET, and use a comparator instead of the inverter. There are ready schematics around.
yes:
Can someone send to me the Elso's latest clock schematics (version6)? :)
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Old 20th May 2010, 06:24 AM   #5
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Hello

Looking at the pdf doc, the Pierce circuit seem to be the best for a simple circuits, but this doc don't talk about jitter in crystal oscillators circuits.

Thank

Bye

Gaetan
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Old 20th May 2010, 06:44 AM   #6
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Hello

Digging a bit more in the forum I also found the LC clock, image included.

Agree that comparator can be better but I have none of them and have a lot of inverter chips.

I know the Kwak clock but it use a comparator.

Thank

Bye

Gaetan
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File Type: gif crystal clock lcl1dia.gif (11.2 KB, 399 views)
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Old 20th May 2010, 08:23 AM   #7
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Hello

I've done a Google search, it's a bit puzzeling, some texts say that the Pierce crystal oscillators are much noisyer than the colpitts crystal oscillators, others texts say that the Pierce crystal oscillators are the better .... ??

Between the Pierce and the colpitts crystal oscillators, which one do have the lowest jitter ?

Btw, I include an image of a Pierce crystal oscillators.

Thank

Bye

Gaetan
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File Type: jpg crystal clock-Pierce type circuit.jpg (74.2 KB, 373 views)

Last edited by gaetan8888; 20th May 2010 at 08:28 AM.
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Old 20th May 2010, 12:36 PM   #8
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Quote:
Originally Posted by EUVL View Post
Bufff, superb information Patrick, thanks to share.

Felipe
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Old 20th May 2010, 03:13 PM   #9
EUVL is offline EUVL  Europe
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In the link I attached in Post 3, the various circuits are rated for their stability and power supply rejection. There is little mention of phase noise.

Here is a couple more to consider :

http://www.wenzel.com/pdffiles1/pdfs/xtalosc.pdf
Library
Library

I always try to understand the subject first before copying anything from the net.
As for oscillators, I am still in the middle of that process, since early this year.
Just wish to have more (free) time.





Patrick
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