[time-nuts] Fwd: 10MHz to 80MHz frequency multiplier suggestions
Christophe Huygens
christophe.huygens at cs.kuleuven.ac.be
Fri Feb 4 18:21:22 UTC 2011
There is ADF code for download (16f819) on my website (locking of
the 1000Mhz Crystek to the 10MHz).
Xtof.
on4iy
On 04/02/11 19:17, Tijd Dingen wrote:
> 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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