Another clock idea TDA1541

Bernhard · 20th May 2004, 09:08 PM

Hi,

what about a crystal oszillator with n x 11.2896 MHz fed to a divide by n counter which gives again the right frequency.

Could be a crystal in overtone mode or a custom crystal with 9 x 11.2896 MHz ...

My idea is that hopefully short time frequency variations ( jitter ) will cancel each other out with averaging.

Also the absolute variations in the high frequency clock will be less ?

Bernhard

Bernhard · 21st May 2004, 09:45 PM

Nobody ?

Jocko Homo · 21st May 2004, 09:53 PM

The divider chain will add lots of jitter. Overtone circuits are harder to get low phase noise, compared to a circuit that operates at around 10 MHz. (256 x Fs isn't that far off.)

Jocko

Bernhard · 22nd May 2004, 10:46 PM

I was thinking about using a prescaler IC as divider.
The kind of chip used in 1GHz counters.

20th May 2004, 09:08 PM	#1
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	Another clock idea TDA1541 Hi, what about a crystal oszillator with n x 11.2896 MHz fed to a divide by n counter which gives again the right frequency. Could be a crystal in overtone mode or a custom crystal with 9 x 11.2896 MHz ... My idea is that hopefully short time frequency variations ( jitter ) will cancel each other out with averaging. Also the absolute variations in the high frequency clock will be less ? Bernhard

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21st May 2004, 09:45 PM	#2
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	Nobody ?

21st May 2004, 09:53 PM	#3
Jocko Homo Banned Join Date: Feb 2002 Location: As far from the NOSsers as possible	The divider chain will add lots of jitter. Overtone circuits are harder to get low phase noise, compared to a circuit that operates at around 10 MHz. (256 x Fs isn't that far off.) Jocko

22nd May 2004, 10:46 PM	#4
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	I was thinking about using a prescaler IC as divider. The kind of chip used in 1GHz counters.

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