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tdnoise or pnoise?

PeppeW90

Hi,

I'm simulating a test bench consisting of a crystal oscillator, followed by several inverter stages that act as buffers.

I want to simulate the phase noise at the output of the last buffer, and eventually see how the added buffers contribute to the total phase noise.

What is the most accurate analysis to do in this case? PSS+PNOISE(sources option) or PSS+PNOISE(timedomain option)?

I don't want to see the integrated jitter or the noise in V^^2/Hz, but the phase noise at the output of the last buffer.

Thanks

Parents
  • PeppeW90
    I tried two methods:
    1)PSS+PNOISE (sources)
    2)PSS+PNOISE(modulated)

    there is 3dBs difference between them, and the second one is more pessimistic(gives 3dB higher than the first)

    Since I don't know whether I can try the newer version (don't know whether my company has the version), can you suggest which of the two is more accurate?

    Finally....there is another designer which did a similar analysis using the PSS+PNOISE(timedomain), and got more optimistic results (several dBs lower). How accurate is this analysis compared to 1) and 2).

    Many thanks for the help. Much appreciated.
Reply
  • PeppeW90
    I tried two methods:
    1)PSS+PNOISE (sources)
    2)PSS+PNOISE(modulated)

    there is 3dBs difference between them, and the second one is more pessimistic(gives 3dB higher than the first)

    Since I don't know whether I can try the newer version (don't know whether my company has the version), can you suggest which of the two is more accurate?

    Finally....there is another designer which did a similar analysis using the PSS+PNOISE(timedomain), and got more optimistic results (several dBs lower). How accurate is this analysis compared to 1) and 2).

    Many thanks for the help. Much appreciated.
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