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Gate Resistance Extraction in Spectre

niranjan1984

Hello All,

     I am trying to understand how to calculate and extract the gate resistance in RFCMOS. I am using IBM90nm (cms9flp) and using nmos_rf device. BSIM4 manual lists the equations for Gate electrode resistance and Intrinsic Input Resistance (Rii). But when I do dc analysis and print operating point I dont not see the gate resistance as one of the parameters (line gm,gds etc there is no parameter called gate resistance). 

   So how to find the value of gate resistance in Spectre? I read from one of the papers that gate resistance can be extracted from plotiing Real(1/Y11). This makes sense but why cant spectre shows the value of gate resistance in its dc oprating point information.

 

Please Help !!

 

Thanks

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