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Long term jitter from SpectreRF's Phase noise?

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Hi,
 
It is true that we can get Jitter from Phase noise simulated from the Spectre by integrating over a noise band of interest. It evident that from the tool that we can get Jcc(cycle to Cycle Jitter) and Jee(Edge to Edge) and Jc.

But I want to know wether we can get "long term jitter" from the SpectreRF's Phase noise simulation.  kindly tell me wether we have any other ways to measure the long term jitter from the spectre.

I beleive the eyediagram technique with transient analysis will not include random noise and other noises.

Also in the Direct plot menu after Pnoise analysis. we have the term "K"( no of cycles). Can you pls tell me what is it.

Can we set k=3000 or (like that number ) to het the longterm jitter?

kindly reply.

Thanks & regards
SavithRu


Originally posted in cdnusers.org by savithru
Parents

  • Long term jitter is normally determined for a specified number of cycles - so yes, entering the number of cycles is the way to do it.

    Of course, you need to make sure you simulate the noise low enough in frequency to include noise over the total number of cycles you want to capture the long term jitter.

    The calculations will ensure that the integration is done properly over the number of cycles you want.

    You can do transient with an eye-diagram, and turn on transient noise, but this is a much less effective way of measuring jitter (it's less efficient, and less accurate, unless your circuit is non-periodic in nature or has a large signal response to the noise) than pnoise.

    Regards,

    Andrew.


    Originally posted in cdnusers.org by adbeckett
Reply

  • Long term jitter is normally determined for a specified number of cycles - so yes, entering the number of cycles is the way to do it.

    Of course, you need to make sure you simulate the noise low enough in frequency to include noise over the total number of cycles you want to capture the long term jitter.

    The calculations will ensure that the integration is done properly over the number of cycles you want.

    You can do transient with an eye-diagram, and turn on transient noise, but this is a much less effective way of measuring jitter (it's less efficient, and less accurate, unless your circuit is non-periodic in nature or has a large signal response to the noise) than pnoise.

    Regards,

    Andrew.


    Originally posted in cdnusers.org by adbeckett
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