trimble Thunderbolt, how to get 25 or 27 mHz from it??
08/01/2018 11:28
Is there an easy way to get 25 or 27 MHz from my Trimble Thunderbolt
as a reference clock at 1v P to P square wave for a Si5351a
synthesizer chip please? I have the David Partridge divider board from
way back that is still going strong, but 25 MHz is not an option as it
divides only. Thanks, please keep replies to the level an idiot might
comprehend :)
--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv
Divide the 10MHz by 2 and use a filter to extract the fifth harmonic from the 5MHz square wave output.
Amplify the 25MHz output from the filter if required...
Bruce
On 09 January 2018 at 00:31 Chris Wilson <chris@chriswilson.tv> wrote:
08/01/2018 11:28
Is there an easy way to get 25 or 27 MHz from my Trimble Thunderbolt
as a reference clock at 1v P to P square wave for a Si5351a
synthesizer chip please? I have the David Partridge divider board from
way back that is still going strong, but 25 MHz is not an option as it
divides only. Thanks, please keep replies to the level an idiot might
comprehend :)
--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv
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Hello Bruce, Sorry, this went to you direct as well, in error.
Thanks for the very fast reply! Would it be possible to use one of
these frequency multiplier IC's? Sounds simpler, but maybe there are
down sides?
http://uk.farnell.com/on-semiconductor/nb3n502dg/pll-clock-multiplier-8soic/dp/2101849
on 08/01/2018 13:11 you wrote:
Divide the 10MHz by 2 and use a filter to extract the fifth
harmonic from the 5MHz square wave output.
Amplify the 25MHz output from the filter if required...
Bruce
On 09 January 2018 at 00:31 Chris Wilson chris@chriswilson.tv wrote:
08/01/2018 11:28
Is there an easy way to get 25 or 27 MHz from my Trimble Thunderbolt
as a reference clock at 1v P to P square wave for a Si5351a
synthesizer chip please? I have the David Partridge divider board from
way back that is still going strong, but 25 MHz is not an option as it
divides only. Thanks, please keep replies to the level an idiot might
comprehend :)
--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv
--
Best Regards,
Chris Wilson.
On Mon, 8 Jan 2018 13:14:16 +0000
Chris Wilson chris@chriswilson.tv wrote:
Thanks for the very fast reply! Would it be possible to use one of
these frequency multiplier IC's? Sounds simpler, but maybe there are
down sides?
http://uk.farnell.com/on-semiconductor/nb3n502dg/pll-clock-multiplier-8soic/dp/2101849
Bruce's idea is much lower noise. The NB3N502 datasheet states
an typical output jitter of 15ps. That's HUGE for a normal VCXO
output that is usually below 1ps. The low-noise OCXOs have something
in the order of 100fs. Alternatively, you can use something like
an ADF4002 and an VCXO with 25/27MHz. That should give you a much
better performance, mostly limited by the VCXO. But you will need
to have a sine-to-square conversion of the 10MHz output of the
Thunderbolt first, as the ADF4002 has a slew-rate limit on its
reference input.
BTW: stay away from any VCXO that mentiones "programable" in its datasheet.
These are XO + fractional PLL combinations where the PLL allows quick
and cheap realization of odd frequencies. But their spurs and noise floor
is much worse than normal XOs.
Attila Kinali
--
It is upon moral qualities that a society is ultimately founded. All
the prosperity and technological sophistication in the world is of no
use without that foundation.
-- Miss Matheson, The Diamond Age, Neil Stephenson
Yes, but the PN noise (outside the PLL bandwidth) will be much higher than with a classical multiplier.
Bruce
On 09 January 2018 at 02:14 Chris Wilson <chris@chriswilson.tv> wrote:
Hello Bruce, Sorry, this went to you direct as well, in error.
Thanks for the very fast reply! Would it be possible to use one of
these frequency multiplier IC's? Sounds simpler, but maybe there are
down sides?
http://uk.farnell.com/on-semiconductor/nb3n502dg/pll-clock-multiplier-8soic/dp/2101849
on 08/01/2018 13:11 you wrote:
Divide the 10MHz by 2 and use a filter to extract the fifth
harmonic from the 5MHz square wave output.
Amplify the 25MHz output from the filter if required...
Bruce
On 09 January 2018 at 00:31 Chris Wilson <chris@chriswilson.tv> wrote:
08/01/2018 11:28
Is there an easy way to get 25 or 27 MHz from my Trimble Thunderbolt
as a reference clock at 1v P to P square wave for a Si5351a
synthesizer chip please? I have the David Partridge divider board from
way back that is still going strong, but 25 MHz is not an option as it
divides only. Thanks, please keep replies to the level an idiot might
comprehend :)
--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv
--
Best Regards,
Chris Wilson.
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Hi
Depending on the noise floor of the phase detector (which probably is not super
duper), even the noise inside the PLL bandwidth may not be all that great.
Bob
On Jan 8, 2018, at 2:23 PM, Bruce Griffiths bruce.griffiths@xtra.co.nz wrote:
Yes, but the PN noise (outside the PLL bandwidth) will be much higher than with a classical multiplier.
Bruce
On 09 January 2018 at 02:14 Chris Wilson <chris@chriswilson.tv> wrote:
Hello Bruce, Sorry, this went to you direct as well, in error.
Thanks for the very fast reply! Would it be possible to use one of
these frequency multiplier IC's? Sounds simpler, but maybe there are
down sides?
http://uk.farnell.com/on-semiconductor/nb3n502dg/pll-clock-multiplier-8soic/dp/2101849
on 08/01/2018 13:11 you wrote:
Divide the 10MHz by 2 and use a filter to extract the fifth
harmonic from the 5MHz square wave output.
Amplify the 25MHz output from the filter if required...
Bruce
On 09 January 2018 at 00:31 Chris Wilson <chris@chriswilson.tv> wrote:
08/01/2018 11:28
Is there an easy way to get 25 or 27 MHz from my Trimble Thunderbolt
as a reference clock at 1v P to P square wave for a Si5351a
synthesizer chip please? I have the David Partridge divider board from
way back that is still going strong, but 25 MHz is not an option as it
divides only. Thanks, please keep replies to the level an idiot might
comprehend :)
--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv
--
Best Regards,
Chris Wilson.
_______________________________________________
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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.