ACWWong
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i'm not quite sure why you are doing sp to get the ft... its much easier to do simple ac sweep, for which terminal currents for the gate and drain are simply available in spectre...
anyway to make idc the variable in the parametric, what i have done in the past is put the idc in the source and bypass it with a cap, so it shorts at high frequency... or bias off a mirror (with mirror reference diode connected and drive with Idc) and use an inductor choke to bias the gate.
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