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WARNING (CMI-2426) negative resistance in mimcap model

isazulkc

Hi

I got this warning when running a spectre (7.2) simulation on my design:

" Warning from spectre in `mimcap':`I6.I1.C44', in `Cascode':`I6.I1', in `DiffAmp':`I6', during hierarchy flattening 

WARNING (CMI-2426): I6.I1.C44.R0: `r' = -162.911 mOhm is negative. "

any idea about what could cause "r" to be negative? Can this warning cause convergence problems or result in inaccurate results ?

Regards,

 KC

Parents

  • Hi Andrew,

    Thanks for the reply, you right ! This negative resistance was due to maximum capacitance length . R0 become negative when the length in over 40um. Then I separate the mimcap into small ones (as it is done in the layout) to avoid this warning.

    Thanks again.

    Regards,

     KC 

Reply

  • Hi Andrew,

    Thanks for the reply, you right ! This negative resistance was due to maximum capacitance length . R0 become negative when the length in over 40um. Then I separate the mimcap into small ones (as it is done in the layout) to avoid this warning.

    Thanks again.

    Regards,

     KC 

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