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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

Parents
  • Andrew Beckett

    Hi Ycyang,

    Recent enough versions of the ADE environment would show lorentzian on the options form. In older versions you would just need to type:

    lorentzian=yes

    in the "Additional Parameters" field on the pnoise/hbnoise options form.

    Given the message you described had a typo in it, I don't know what exactly you tried - maybe if this doesn't work you can post both the analysis statements (cut and pasted, rather than transcribed) and the complete spectre.out file (as an attachment; go to the Options Tab when you reply to the post).

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Hi Ycyang,

    Recent enough versions of the ADE environment would show lorentzian on the options form. In older versions you would just need to type:

    lorentzian=yes

    in the "Additional Parameters" field on the pnoise/hbnoise options form.

    Given the message you described had a typo in it, I don't know what exactly you tried - maybe if this doesn't work you can post both the analysis statements (cut and pasted, rather than transcribed) and the complete spectre.out file (as an attachment; go to the Options Tab when you reply to the post).

    Regards,

    Andrew.

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