Re: [time-nuts] Does doubling a frequency alter the original ADEV of the frequency?

[timeok]

See also:

http://www.timeok.it/wp-content/uploads/2015/08/high-performance-frequency-doublerv1-31.pdf

Luciano
www.timeok.it


From: "time-nuts" time-nuts-boun...@febo.com
To: time-nuts@febo.com
Cc: 
Date: Sat, 9 Jul 2016 17:57:57 -0400
Subject: Re: [time-nuts] Does doubling a frequency alter the original ADEV of 
the frequency?


James wrote:
 
> Is there a preferred frequency doubler circuit which would do the least harm 
> to the ADEV of the oscillator?  The signal can be a square wave and does not 
> need to be a sine wave.  Thanks.  Jim Robbins
 
A quadrature-fed DBM produces the lowest jitter and noise.  My 
implementation can be found at:
 
<http://www.ko4bb.com/getsimple/index.php?id=download=02_GPS_Timing/4_App_Notes_and_Articles/Frequency_doubler_quadrature_DBM.pdf>
 
A well-designed push-push frequency doubler is probably second (but note 
that many push-push designs you find on the web have various common 
design flaws).  My implementation can be found at:
 
<http://www.ko4bb.com/getsimple/index.php?id=download=02_GPS_Timing/Frequency_doubler_push_push_JFET_schematic_description_discussion.pdf>
 
Best regards,
 
Charles
 
 
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Re: [time-nuts] Does doubling a frequency alter the original ADEV of the frequency?

[Charles Steinmetz]

David wrote:


Thanks for the reminder about this... it will neatly solve a problem I
have at hand. Can you advise which core you used for the transformer?


If you mean the quadrature hybrid, I use an FT37-61 toroid core.  One of 
the smaller Mix 61 balun cores should also work, but with the toroid you 
can trim the inductance by spreading or compacting the windings on the 
core.


If you mean the transformers for the push-push FET doubler, I usually 
use commercial parts (MCL or Coilcraft).


Best regards,

Charles


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Re: [time-nuts] Does doubling a frequency alter the original ADEV of the frequency?

[davidh]

Charles,

Thanks for the reminder about this... it will neatly solve a problem I 
have at hand. Can you advise which core you used for the transformer?


Thanks,

david


On 10/07/2016 07:57, Charles Steinmetz wrote:

James wrote:


Is there a preferred frequency doubler circuit which would do the
least harm to the ADEV of the oscillator?  The signal can be a square
wave and does not need to be a sine wave.  Thanks.  Jim Robbins


A quadrature-fed DBM produces the lowest jitter and noise.  My
implementation can be found at:




A well-designed push-push frequency doubler is probably second (but note
that many push-push designs you find on the web have various common
design flaws).  My implementation can be found at:




Best regards,

Charles





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Re: [time-nuts] Does doubling a frequency alter the original ADEV of the frequency?

[Charles Steinmetz]

James wrote:


Is there a preferred frequency doubler circuit which would do the least harm to 
the ADEV of the oscillator?  The signal can be a square wave and does not need 
to be a sine wave.  Thanks.  Jim Robbins


A quadrature-fed DBM produces the lowest jitter and noise.  My 
implementation can be found at:




A well-designed push-push frequency doubler is probably second (but note 
that many push-push designs you find on the web have various common 
design flaws).  My implementation can be found at:




Best regards,

Charles


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Re: [time-nuts] Does doubling a frequency alter the original ADEV of the frequency?

[Bob Camp]

Hi

The simple answer is that most doublers that are ok for phase noise will not 
degrade ADEV. 
The issues with ADEV come when your doubler is out in a changing environment 
and your 
oscillator is not ( = it’s an OCXO). The answer to that problem is pretty 
simple if you have an issue …
ovenize the doubler.

Bob

> On Jul 9, 2016, at 3:48 PM, James Robbins  wrote:
> 
> Would doubling the frequency of a 5 MHz oscillator to 10 MHz affect (or 
> degrade) the natural ADEV of the 5 MHz oscillator?  If so, how does it affect 
> the original ADEV?  Is there a preferred frequency doubler circuit which 
> would do the least harm to the ADEV of the oscillator?  The signal can be a 
> square wave and does not need to be a sine wave.  Thanks.  Jim Robbins
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> time-nuts mailing list -- time-nuts@febo.com
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[time-nuts] Does doubling a frequency alter the original ADEV of the frequency?

[James Robbins]

Would doubling the frequency of a 5 MHz oscillator to 10 MHz affect (or 
degrade) the natural ADEV of the 5 MHz oscillator?  If so, how does it affect 
the original ADEV?  Is there a preferred frequency doubler circuit which would 
do the least harm to the ADEV of the oscillator?  The signal can be a square 
wave and does not need to be a sine wave.  Thanks.  Jim Robbins
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