how to measure gm of a invertor using spice

[xusoso]

I want to measure gm of a invertor when it is operating at its dc operating point.
Help!

 

[Humungus]

just ask your simulator to display the gm of the given transistor. Even if this could be different in different simulator, I guess you can simply ask for gm(mx), where mx is the transistor for which you want to get its gm. For a CMOS inverter, the total gm is the addition of the gm's of both transistors. Read the your simulator's manual to see how to extact the gm.

 

[xusoso]

my simulator is Hspice

Added after 8 minutes:

I find it in .lis
is it right?

 

[c_m_o_s]

yes, you can see it in .lis file, and many other dc operating point parameters.

wondering wether the gm of inverter at dc op point will be zero, considering the fact that the current through it will be zero ?