the jitter of XO,is mainly come from its circuit? - diyAudio
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Old 15th November 2004, 04:38 AM   #1
X.G. is offline X.G.  China
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Default the jitter of XO,is mainly come from its circuit?

In the book 'High-speed digital design' of Dr. Howard Johnson,wrote that(sorry, I must translate from Chinese ,because the book I got is the Chinese version ,I did not get the English version ):

http://www.sigcon.com/
Click the image to open in full size.
Click the image to open in full size.

the jitter of XO come from 4 sources,
1. the heat noise of the crystal
2.the mechanic noise of the crystal
3. the circuit's noise.this noise is much than the sum of 1 & 2 in general.
4.the noise of power supply.this noise is troublesome,and most of XO are trouble in that.

Cause I want to DIY a XO......my question is,the jitter of 'low noise' XO is mainly come from 1 & 2 or 3 & 4?...in the other words,which contribute much in the low noise XO,the cuicuit?or the crystal?

any input will be appreciated

sorry my poor English.


X.G.
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Old 17th November 2004, 10:25 AM   #2
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Default Re: the jitter of XO,is mainly come from its circuit?

Quote:
Originally posted by X.G.
In the book 'High-speed digital design' of Dr. Howard Johnson,wrote that(sorry, I must translate from Chinese ,because the book I got is the Chinese version ,I did not get the English version ):

http://www.sigcon.com/
Click the image to open in full size.
Click the image to open in full size.

the jitter of XO come from 4 sources,
1. the heat noise of the crystal
2.the mechanic noise of the crystal
3. the circuit's noise.this noise is much than the sum of 1 & 2 in general.
4.the noise of power supply.this noise is troublesome,and most of XO are trouble in that.

Cause I want to DIY a XO......my question is,the jitter of 'low noise' XO is mainly come from 1 & 2 or 3 & 4?...in the other words,which contribute much in the low noise XO,the cuicuit?or the crystal?

any input will be appreciated

sorry my poor English.


X.G.


Hi,

Yes, 3 and 4 dominate usually

cheers
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Old 21st November 2004, 02:47 PM   #3
X.G. is offline X.G.  China
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Default Re: Re: the jitter of XO,is mainly come from its circuit?

Quote:
Originally posted by Guido Tent




Hi,

Yes, 3 and 4 dominate usually

cheers
Thanks a lot,Guido Tent.

I still have a little puzzle...Is your reply refer to the low noise XO,or not?

and... maybe the improve method of ML 31.5 transport just get the better performance in only 5% or lesser?

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Old 21st November 2004, 10:04 PM   #4
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Default Re: Re: Re: the jitter of XO,is mainly come from its circuit?

Quote:
Originally posted by X.G.


Thanks a lot,Guido Tent.

I still have a little puzzle...Is your reply refer to the low noise XO,or not?

and... maybe the improve method of ML 31.5 transport just get the better performance in only 5% or lesser?

Click the image to open in full size.

Hi

This is valid for all oscillators

What should I comment on a picture ?

It looks nice......

cheers
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Old 22nd November 2004, 12:06 AM   #5
X.G. is offline X.G.  China
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Default Re: Re: Re: Re: the jitter of XO,is mainly come from its circuit?

Quote:
Originally posted by Guido Tent

What should I comment on a picture ?

It looks nice......

cheers
sorry for my poor English.

My meaning is that the ML31.5's method to reduce the mechanic noise maybe just for the improve of 5% or lesser.
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