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[30pts for real help] Jitter to Bandwith ?

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mouzid

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Hello,
I need to know how to determine the bandwith limits of a 800Mhz PLL having using a 50Mhz reference clock.
Actually I have a digital circuits using a 800Mhz (period =1250ns) clock signal for synchronization. By simulation I measured the maximum (1270ns) and minimum (1220ns) clocks period variation making the circuit unfunctional.
The maximum jitter supported by is 30ps (or 60 ps peak to peak). How to understand this in terms of bandwith and Phase margin limits ?

Regards,
 

You should not read any jitter from simulation. (No noise in transient simulation.)

If you do read a huge jitter from simulation, you either have a tool issue, or a circuit function issue.
 

    M

    mouzid

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If your supply and the reference are ideal, you should not see any jitter. Numerical errors can easily be in 60ps range for transient simulations
 

    M

    mouzid

    Points: 2
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