+ Post New Thread
Results 1 to 5 of 5
  1. #1
    Junior Member level 2
    Points: 1,411, Level: 8
    Achievements:
    7 years registered

    Join Date
    Sep 2012
    Location
    India
    Posts
    20
    Helped
    0 / 0
    Points
    1,411
    Level
    8

    PN and jitter for low frequency oscillators

    I wanted to measure jitter (by simulation) for my 10KHz oscillator. Can I run a PN analysis using spectre and integrate it to find jitter?

    Why there are no Phase noise plots for low frequency oscillators and how are their jitter characterised in general?

    •   AltAdvertisement

        
       

  2. #2
    Advanced Member level 5
    Points: 30,757, Level: 42
    BigBoss's Avatar
    Join Date
    Nov 2001
    Location
    Turkey
    Posts
    4,512
    Helped
    1359 / 1359
    Points
    30,757
    Level
    42

    Re: PN and jitter for low frequency oscillators

    You can do PSS+PNOISE Analysis but the accuracy won't be so good.Because the most difficult part of a modelization is to predict Low Frequency Noise components.



    •   AltAdvertisement

        
       

  3. #3
    Junior Member level 2
    Points: 1,411, Level: 8
    Achievements:
    7 years registered

    Join Date
    Sep 2012
    Location
    India
    Posts
    20
    Helped
    0 / 0
    Points
    1,411
    Level
    8

    Re: PN and jitter for low frequency oscillators

    Quote Originally Posted by BigBoss View Post
    You can do PSS+PNOISE Analysis but the accuracy won't be so good.Because the most difficult part of a modelization is to predict Low Frequency Noise components.

    Hi, thanks for the reply. Can you elaborate on this, as to why the accuracy will not be good?



    •   AltAdvertisement

        
       

  4. #4
    Advanced Member level 5
    Points: 30,757, Level: 42
    BigBoss's Avatar
    Join Date
    Nov 2001
    Location
    Turkey
    Posts
    4,512
    Helped
    1359 / 1359
    Points
    30,757
    Level
    42

    Re: PN and jitter for low frequency oscillators

    Quote Originally Posted by vinogunasekaran View Post
    Hi, thanks for the reply. Can you elaborate on this, as to why the accuracy will not be good?
    The answer was there..
    When you simulate any kind of circuit in fact you're using a special calculator. nothing more ..And every element has been characterized/modeled by some mathematical expressions and this calculator uses those expressions.If these math. equations are not sufficiently correct, the result will also have some error margins ( in a acceptable rate or more ).
    One of the most difficult portion of modeling engineering is to model Low Frequency Noise task.For instance 1/f Noise Model for GaAs or III/IV Compound Semiconductor Devices is not accurate at all due to this difficulty..Therefore analysis for Low Frequency Noise will not be very accurate , maybe an approximate value..



  5. #5
    Junior Member level 2
    Points: 1,411, Level: 8
    Achievements:
    7 years registered

    Join Date
    Sep 2012
    Location
    India
    Posts
    20
    Helped
    0 / 0
    Points
    1,411
    Level
    8

    Re: PN and jitter for low frequency oscillators

    Quote Originally Posted by BigBoss View Post
    The answer was there..
    When you simulate any kind of circuit in fact you're using a special calculator. nothing more ..And every element has been characterized/modeled by some mathematical expressions and this calculator uses those expressions.If these math. equations are not sufficiently correct, the result will also have some error margins ( in a acceptable rate or more ).
    One of the most difficult portion of modeling engineering is to model Low Frequency Noise task.For instance 1/f Noise Model for GaAs or III/IV Compound Semiconductor Devices is not accurate at all due to this difficulty..Therefore analysis for Low Frequency Noise will not be very accurate , maybe an approximate value..
    okay. Got it.



--[[ ]]--