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GMRES solver convergence issue during PNOISE analysis

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Hi,

I am simulating phase noise for my VCO by running HB PSS followed by Pnoise analysis.

During Pnoise analysis, I keep seeing following warning messages which make my simulation super slow:

Warning:  GMRES solver could not converge to the desired tolerance. Please try to increase krylov_size.

Could anyone tell me what is the cause of this warning and how to resolve it? 

Thanks in advance,

Junyi


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