[time-nuts] Generating a solid PPS from 10Mhz source

Ole Petter Ronningen opronningen at gmail.com
Wed Jan 13 08:31:25 EST 2016


Sounds like a PICDIV is just about right:
http://www.leapsecond.com/pic/picdiv.htm

Ole

On Wed, Jan 13, 2016 at 10:22 AM, Jerome Blaha <jblaha at polariswireless.com>
wrote:

> Hey Guys,
>
> Is there an easy circuit to build that can consistently deliver a 1 PPS
> from a 10MHz source with excellent resolution and repeatability?  My first
> application is to test different 10MHz oscillators without a TIC always
> attached and then compare the PPS output change over time against a master
> GPSDO PPS with an HP53132A.
>
> The circuit used for PPS generation would have to deliver consistent PPS
> output with preferably not more than 100ps noise or jitter, assuming a
> perfect source.  I'm totally guessing that for this resolution, the PPS
> would have to be generated and accurate to within 0.001Hz every second.  If
> this is too difficult, maybe the integration time can be increased to
> generate one pulse every 10second or every 100,000,000.00 cycles?
>
> Finally, is a square 10Mhz reference any better in this case than a
> sinusoidal input for generating the PPS?
>
> Thanks,
> Jerome
>
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