Adee, Piers,
I don't think the +/-100 ppm spec. can be used to calculate
peak-to-peak LF jitter.
One could use a +/-100 ppm crystal oscillator on the host, which
could operate at either edge of the spec. range. The LF jitter
effect should be in addition to the +/-100ppm impairment.
Thanks,
Vinu
On 01/17/2018 11:33 AM, Ali Ghiasi
wrote:
Bill
Typically DC-DC convertor will have one dominant
tone output like 3rd or 5th harmonic, etc. Given today
efficient DC-DC convertors operates at > 1MHz
it is much easier to filter the spurs with
reasonable size low-ESR capacitor, which was not the case when
DC-DC convertors operated at 50 KHz!
Obviously >1 MHz DC-DC convertor can’t generate
multiple of UIs into SerDes output and pass limits we already
have in place!
The analysis was done analysing a
single tone.
Is it possible to get a bad spur from tones
from a switching power supply that could influence
the behavior in the analysis?