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SpectreRF pnoise error SPCRTRF-15397

FrankKK

Hi,

I have a question about a spectreRF error when running harmonic balance pnoise. for a VCO.

It was able to run a pss succesfully, but when it starts running the pnoise, I get the following error.

-------------

Error found by spectre at freq = 100 kHz during PNoise analysis `pnoise'.
ERROR (SPCRTRF-15397): The pnoise analysis was skipped since the collected total noise is zero.

Analysis `pnoise' was terminated prematurely due to an error.

-----------------

Interestingly, the same pss/pnoise setting can  run successfully with the same circuit/vco  but at a low vco speed setting.

I was not able to find any information on this error code. Any help is appreciated. thanks

Frank

Version 15.1.0.644.isr13 64bit

Harmonic balance

  • Frank,

    That's odd. I found a few old examples with specific situations which were fixed in older versions than the version you're using. I did also find a recent report when using psitft models which was fixed in SPECTRE17.1 ISR6 (not sure if you're using those - that's not widely used, but I guess it's possible).

    Other than that, I can only imagine that this could occur if you specify the output node as something that has no signal path to any noise source.

    So I'd check the circuit to make sure your noise output node is connected OK, and also check with the latest SPECTRE17.1 hotfix. If it's still an issue, contact customer support as it shouldn't happen and must be a bug which only shows up with your circuit/models.

    Regards,

    Andrew.

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