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How to add Full Spectrum Pnoise analysis in IC5141

RFStuff over 10 years ago

Dear All,

I am using IC5141 and MMSIM-14.

But in GUI I am not getting the "Full Spectrum Pnoise analysis" option.

Is there any way of enabling this above option ?

Kind Regards,

Frank Wiedmann over 10 years ago

From Cadence Solution 11732744 (http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11732744):

Prior to IC615 ISR7, you can specify full spectrum pnoise by opening the pnoise options form and typing pnoisemethod=fullspectrum in the "additional parameters" field. Set maxacfreq to the highest anticipated noise frequency.

You will also have to select APS.
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RFStuff over 10 years ago

Dear Frank,

I used ponoisemethod = fullspectrum. When I ran the pnoise simulation it ran successfully.

But it is showing following message

Notice from spectre during PNoise analysis `pnoiseOut3'.
Use full spectrum for normal noise analysis
MaxSideband for colored noise sources (e.g. 1/f-noise) is not set, automatically set it to 3

Looks like it is NOT actually taking fullspectrum analysis.

How one can know whether spectre actually using fullspectrum option ?
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Andrew Beckett over 10 years ago

Actually these warnings are as a result of a request that Frank made ;-) . This is telling you that you didn't set maxsideband, and for the purposes of the colored noise sources it needed to set to (only) 3. It tells you that fullspectrum is being used - why do you think it isn't?
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Frank Wiedmann over 10 years ago

The request was for making clear that the maxsideband parameter only applies to colored noise sources in this case. The warning already existed before this, if I remember correctly.
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RFStuff over 10 years ago

I was afraid as it is taking sideband =3 only NOT the full spectrum.

Do you think it will be better for me to also fill sideband = say (50) along with fullspectrum option ?
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Frank Wiedmann over 10 years ago

For pnoisemethod=fullspectrum, you only need to increase maxsideband if you have a very low pss frequency, so that you still have significant contributions of 1/f-noise from higher sidebands.
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