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Finfet Stacked CMOS oppoint problem

JoshuaXiang

Hi All,

I'm trying to use "Measuring Stacked-FET Parameters" function of SPECTRE16, in order to find oppoint, such as gm, gds.. for stacked Finfet. I have done all settings specified in spectre user manual, and the results shows that except for 'vth' all other params seem to have been correct simulated. But the value for 'vth' is 'nan'.

this is warning for "vth":

Warning from spectre.

    WARNING: I0.I16<0>: There is no model param `ivth' for model nch_svt_mac.1, so ignore `vth' output.

Actually I cannot find a 'ivth' param in mosfet models.. How can I solve this problem?

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  • JoshuaXiang

    I finally found vth value. If I use expression OP("/I0/I16<0>","vth"), I can get the value is 435.2mV, but if using pv("I0.I16\\<0\\>" "vth" ?result "dcOpInfo"), the result is nan. That's quite weird... Is it a lttle bug of subcirsuit oppoint calculation?

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  • JoshuaXiang

    I finally found vth value. If I use expression OP("/I0/I16<0>","vth"), I can get the value is 435.2mV, but if using pv("I0.I16\\<0\\>" "vth" ?result "dcOpInfo"), the result is nan. That's quite weird... Is it a lttle bug of subcirsuit oppoint calculation?

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