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 Issue with Flicker phase noise simulaiton with PSS+Pnoise in cadence  

Last post Tue, Sep 17 2013 3:38 AM by lraf. 3 replies.
Started by lraf 21 Jan 2013 06:27 AM. Topic has 3 replies and 4917 views
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  • Mon, Jan 21 2013 6:27 AM

    • lraf
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    • Joined on Mon, Mar 8 2010
    • Posts 8
    • Points 150
    Issue with Flicker phase noise simulaiton with PSS+Pnoise in cadence Reply

    I have a problem with Flicker phase noise of a quartz crystal oscillator (RLC equivalent cirucit + opamp current amplifier + opamp inverter) simulated with PSS + Pnoise of CADENCE:

    Indeed I simulate the phase noise of a quartz crystal oscillator and I include only Flicker noise (verilogA) in the feedback opamp inverter. The simulated phase noise shows white phase noise, f-2 phase noise and f-3 phase noise near the carrier, instead of only f-1 phase noise and f-3 phase noise!

    Can you please help me solve this problem?

    Best regards

    Raphael

    • Post Points: 20
  • Tue, Jan 22 2013 12:29 AM

    Re: Issue with Flicker phase noise simulaiton with PSS+Pnoise in cadence Reply
    It would help to see your veriloga model and the input.scs that you are simulating. Much easier than trying to guess what you've done.

    Thanks,
    Andrew
    • Post Points: 20
  • Tue, Jan 22 2013 2:01 AM

    • lraf
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    • Joined on Mon, Mar 8 2010
    • Posts 8
    • Points 150
    Re: Issue with Flicker phase noise simulaiton with PSS+Pnoise in cadence Reply

     Dear andrew,

    Thank you for your prompt answer!

    Please find attached to this post:

    the input.scs file, the verilogA model of noise, and the simulations results: transient, noise, PSS, Pnoise and noise summary for phase noise.

    The Phase noise and its associated noise summary show that there is only Flicker noise contribution to phase noise but there is still 0 slope phase noise and 1/f2 slope phase noise whereas there should be only 1/f slope and 1/f3 slope phase noise !

    I hope you have enough informations..

    Thanks

    Raphael

     SCHEMATIC:

     

     

     

     
    • Post Points: 5
  • Tue, Sep 17 2013 3:38 AM

    • lraf
    • Not Ranked
    • Joined on Mon, Mar 8 2010
    • Posts 8
    • Points 150
    Re: Issue with Flicker phase noise simulaiton with PSS+Pnoise in cadence Reply

     still no answer....... snifff.....

    • Post Points: 5
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Started by lraf at 21 Jan 2013 06:27 AM. Topic has 3 replies.