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Cannot get the Lorentzian plot in Pnoise simulation

ycyang

Hi,

I am trying to run the PSS+Pnoise to get the linewidth of the VCO.
I have set the Pnoise option "augmented=yes" for PSS+Pnoise oscillator simulations.
Nevertheless, I cannot get the Lorentzian plot, the phase noise still goes up and becomes larger than 0 dBc at low frequencies.
The logfile says:"Compute Floquet mode for autonomous ciruits... ...".
It seems the simulator does not use frequency-aware PPV method.

Is there anything wrong in my setting?
By the way, the MMSIM version I use is 7.2ISR7

Thanks

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  • ycyang

    Hi Andrew,

    Thank you very much for your response, but I cannot find the parameter "lorentzian" on pnoise and hbnoise.
    Is it a check box or I have to type it in the additional parameter?
    Besides, I saw a message in the output log file saying "pnoise 'lorentzain' is not a valid parameter for an instance of 'pnoise'. Ignored"
    What does it mean?
    However, after I run the pnosie simulation, the simulation result still shows the line width.
    I am very confused why it can still compute the line width and if it is a correct result.

    Thanks

    Regards,

    ycyang

Reply
  • ycyang

    Hi Andrew,

    Thank you very much for your response, but I cannot find the parameter "lorentzian" on pnoise and hbnoise.
    Is it a check box or I have to type it in the additional parameter?
    Besides, I saw a message in the output log file saying "pnoise 'lorentzain' is not a valid parameter for an instance of 'pnoise'. Ignored"
    What does it mean?
    However, after I run the pnosie simulation, the simulation result still shows the line width.
    I am very confused why it can still compute the line width and if it is a correct result.

    Thanks

    Regards,

    ycyang

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