[time-nuts] Fwd: 10MHz to 80MHz frequency multiplier suggestions

Tijd Dingen tijddingen at yahoo.com
Fri Feb 4 18:17:00 UTC 2011


Hello Said,

That CVHD-950-100 looks to be just the ticket. Nice price/performance. Thank you 
for the recommendation! :)

I also noticed their CVS575-500. Nice, bit pricier though...

regards,
Fred


----- Original Message ----
From: "SAIDJACK at aol.com" <SAIDJACK at aol.com>
To: time-nuts at febo.com
Sent: Thu, February 3, 2011 6:06:16 AM
Subject: Re: [time-nuts] Fwd: 10MHz to 80MHz frequency multiplier suggestions

Hi Fred,

I like the Crystek CVHD parts, and MtronPTI also has a number of good ones.

bye,
Said


In a message dated 2/2/2011 19:50:10 Pacific Standard Time,  
tijddingen at yahoo.com writes:

Hello  Said,

> Low Noise 100MHz VCXO's are readily available at  mouser  and digikey (so 
> are 80MHz units), and programming the  ADF4002 is  straight forward with 
the 
> help from the AD online  tools. It can be bit-banged  with any 
microcontroller.


Any  particular ones that are in stock at digikey/mouser that you would  
recommend?

regards,
Fred




----- Original  Message ----
From: "SAIDJACK at aol.com" <SAIDJACK at aol.com>
To:  time-nuts at febo.com
Sent: Wed, February 2, 2011 9:12:38 PM
Subject:  [time-nuts] Fwd:  10MHz to 80MHz frequency multiplier  suggestions


Hello Raj,

our ULN-1100 and ULN-2550 GPSDO's use  a 100MHz VCXO locked to the 10MHz  
OCXO via an ADF4002 PLL with less  than 40Hz bandwidth. After careful  
optimization of the layout and  the loop filter, the phase noise results 
are  
quite 

excellent  at 100MHz, see the attached plot. The plot shows two versions of 

the  PLL loop filter from the design phase of the products, one has been 
more  
optimized. You can see that the noise floor is almost -170dBc/Hz at  
100MHz.

You get the best of two worlds: the absolute frequency accuracy  of the  
GPSDO, and the very low phase noise of the VCXO above the PLL  bandwidth. 
It is  
clearly visible that the VCXO phase noise inside  the loop bandwidth is 
actually  also reduced by locking it to the  10MHz OCXO (the PN curve below 
the 
loop  bandwidth frequency of ~30Hz  would just continue going up without 
the  
PLL)

Low Noise  100MHz VCXO's are readily available at mouser  and digikey (so 
are  80MHz units), and programming the ADF4002 is  straight forward with 
the  
help from the AD online tools. It can be bit-banged  with any  
microcontroller.

bye,
Said




From: Raj  <_vu2zap at gmail.com_ (mailto:vu2zap at gmail.com) >
Date:  January  31, 2011 21:11:46 HST
To: Discussion of precise time and  frequency  measurement 
<_time-nuts at febo.com_ (mailto:time-nuts at febo.com)  >
Subject:  Re: [time-nuts] 10MHz to 80MHz frequency  multiplier  suggestions
Reply-To: Discussion of precise time and  frequency  measurement 
<_time-nuts at febo.com_  (mailto:time-nuts at febo.com) >





I was contemplating  the same thing. I fed the output to a bifilar  
transformer and  
diode doubler and got good results. I have  to add an amp and double  it 
again twice
more. It is still on  breadboard. The object was to  multiply the error 8x 
and  compare.

Probably a PLL locking to  80 Mhz  will retain the long term accuracy of 
the 
TBolt   reference.

Raj,  vu2zap

At 31-01-2011, you  wrote:

I'd like to convert the 10MHz output of a  Thunderbolt to  80MHz: it should 
be


used as a 3.3V clock for an A/D   converter.


Even if I have already taken a look to   documentation from KO4BB and Wenzel


regarding frequency   multiplier,


I'm asking if you have some more references  or  even better, some 
schematics


of a working 8x   multiplier.





.     thanks in   advance


_  Elio   Corbolante.



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