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Simulators >> Circuit Simulators >> Unrealatic simulation of Fmax for IBM90nm in cadence
https://designers-guide.org/forum/YaBB.pl?num=1342108198

Message started by nadroit on Jul 12^th, 2012, 8:49am

Title: Unrealatic simulation of Fmax for IBM90nm in cadence
Post by nadroit on Jul 12^th, 2012, 8:49am

Hello All,
I am trying to measure Fmax of IBM 90nm technology in cadence. I am measuring S parameters and plotting Gumx. I get Fmax around 500GHz for 90nm while reported Fmax for 90nm are around 300GHz. I am using rfmos transistor & technology uses BSIM4.4 model. I am not sure what I am doing wrong please help.

Thanks

Title: Re: Unrealatic simulation of Fmax for IBM90nm in cadence
Post by Geoffrey_Coram on Jul 18^th, 2012, 10:01am

Are you including any layout parasitics? The metal stack that's needed to connect to the device can add a lot of capacitance, which may not be accounted for in the rfmos model.