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 ↓↓ Following post(I can't reply to previos post) 

Last post Wed, Feb 9 2011 12:34 PM by Frank Wiedmann. 1 replies.
Started by chadong 30 Jan 2011 08:26 PM. Topic has 1 replies and 1136 views
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  • Sun, Jan 30 2011 8:26 PM

    • chadong
    • Not Ranked
    • Joined on Fri, Jan 28 2011
    • Seoul, South Korea
    • Posts 11
    • Points 160
    ↓↓ Following post(I can't reply to previos post) Reply

    Frank. I appreciate your help. Your replies were really helpful.

    Unfortunately, I still have some questions. Can you give me more answers?

    1. From your suggested documents, meaningful jitter for autonomous circuit is Jc.

    However in 10page "Jitter measurements using SpectreRF application note" by Cadence, Jc is timing difference between ideal reference  and output.

    There is no reference OSC in case of VCO. From definition the meaningful jitter of VCO is Jss, isn't it?

    2. And you said that one should make jitter property as PM jitter not FM jitter for autonomous circuit.

    However I can't do it. It is selected automatically. How can I change the jitter property in analysis setup.

    3. If all blocks in ADC are drived by VCO, how can I choose k the number of cycle? If I choose k higher than 1, the accumulated jitter increase infinitely.

    4. What I really want to know is the method to calculate jitter by spectreRF.
    Therefore I orginized a flow as below.
    >> Direct plot >> Main form >> pnoise jitter >> jc or jcc >> define integration range >> plot

    However there is a problem, you said the frequencies fc and fo do not affect the integration.

    But the calculated jitter value is varied too much with the integration range.

    Is there no correct method to calculate jitter by spectreRF?

    • Post Points: 20
  • Wed, Feb 9 2011 12:34 PM

    • Frank Wiedmann
    • Top 75 Contributor
    • Joined on Wed, Jul 16 2008
    • Muenchen, Bavaria
    • Posts 96
    • Points 1,575
    Re: ↓↓ Following post(I can't reply to previos post) Reply

    Please see the thread "Jitter calculation from phase noise??" for my answers.

    • Post Points: 5
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Started by chadong at 30 Jan 2011 08:26 PM. Topic has 1 replies.