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

Attila Kinali attila at kinali.ch
Wed Jan 20 09:21:02 EST 2016


On Wed, 20 Jan 2016 14:13:11 +0000
"Poul-Henning Kamp" <phk at phk.freebsd.dk> wrote:

> >The test results showed a quite more
> >detailed structure with few delays over 100ps and most being between
> >20ps and 80ps. Interestingly, some were close to 0ps, for which
> >we have no explanation good explanation.
> 
> Any on-chip PLL's with "spread-spectrum" to fudge EMI tests ?

Nope, the cyclone4 PLLs do not support spread spectrum.
Also, the 0ps positions were stable (suggesting some FPGA
internal feature to be the cause), but they weren't evenly
spread over the delay chain.

			Attila Kinali

-- 
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