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An error with Momentum S parameter blocks in Spectre

JoshK

Hi,

I have a design with Momentum blocks incorporated inside (as 'mom' blocks). All Momentum blocks are simulated up to 300GHz.

However, when running harmonic balance simulation, I get an error: "Can not enforce causality of S parameter for assigned 'fmax' value is equal to or less than the maximal frequency in...." where the rest is the path to the mommdl/text.txt file of the momentum cell view.

The maximal frequency of the HB simulation (100GHz) is far lower than the upprer simulated Momentum frequency (300GHz).

Any ideas on how to solve the problem?

Thanks. 

Parents
  • JoshK

    When I look at the properties fo the Momentum generated block ("Edit Object Properties"), all parameters are greyed out, and the only filled parameter is "ImpMaxFreq", which is set to the frequency up to which I solved in Momentum. However, I cannot change its value.

    How can I change the maximum frequency as you suggested?

    Thank you for the help.

Reply
  • JoshK

    When I look at the properties fo the Momentum generated block ("Edit Object Properties"), all parameters are greyed out, and the only filled parameter is "ImpMaxFreq", which is set to the frequency up to which I solved in Momentum. However, I cannot change its value.

    How can I change the maximum frequency as you suggested?

    Thank you for the help.

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