Ultra-High Precision Clock generator advices needed.

[AMCC]

Hi all,

I need to have a programmable clock in the range of 100-300 Mhz with jitter bellow 1 ps (rms).
My first solution is to use a VCO with a phase detector and frequency dviders.
The proble is that, if I use a 1Ghz VCO i can only obtain 1GHz/N (N integer) or 250/200/166,67/142,86/125 and 111 MHz (corresponding to N=4 to 9) in the range that I require.

Does any one have idea how can I obtain 1 ps rms multiple frequencies in the range 100-300 Mhz.

Thank you very much.

Alvaro

 

[Btrend]

hi,
as I know in CMOS technique,
clock with tj(rms)=1ps is nearly impossible in real world.

 

[sinatra]

Maybe using 2 high frequency oscilators, like 20GHz and 20GHz+-300MHz.
Beating the signals generated by the 2 oscilators you would have a low jitter product in your range. And the phase noise should be quite low. I don't know if it is possible to get down to 1ps rms, it will surely be very difficult.
If one of the oscilators is a VCO, then you could maybe have the desired frequency span...

S.