How to make gm/id plot in Cadence Virtuoso ADE (English pronunciation)

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In Cadence IC6.1.8, you can use the "calculator function" to plot gm/id vs id/W and gm/id vs gm*ro without much effort.

This video shows the complete simulation flow. Hope it helps you.

NMOS in gm/id plot:

Eric Yeh

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Thank you for your video. Looking forward to see more of your tutorial in english as well.

ashwiniganesh

Thanks for doing this video. I don't particularly understand why a ID/W Simulation is of interest. When Designing the circuit one never types directly a value for W instead always W/L.

Is there an explanation available to some of you why this type of simulation was done?
Thank you

Gruftgrabbler

Hello, thank you for sharing your video.
is there any reason to choose W=10um initially?
just selection for lambda(Vds coefficient) area?

Pathfinder-vzbe

Also note gmoverid is a BSIM param and NOT equivalent to gm over id if plotted separately

samvenker

Hello
Why are you sweeping L, we have to fix L for a technology, right?
And I don't get how to calculated W from this experiment.

skgupta

Can you please upload other videos in English? Thank you for video

pravinmane

How to use gm/id methodology to design circuit with FinFet process?
In FinFet, W(width) is a function of number of fins. Just get gm/id vs id/(number of fins)? or gm/id vs id/(number of fingers)? or gm/id vs id/multiplier?

xxggww

你好老师想问下能用这个方法将ft和gm/id的曲线图画出来吗？我这里尝试了下一直显示eval err ac仿真和sin波都有加不知道问题出在了哪里

wendorisy

Additionally you are assuming OS params are available in every PDK, but this is not the case. It would be better to create the expressions with getInfo("{instance}" result? "DcOpInfo") as it is more general

samvenker

一旦gm/id确定后, 管子的Vgs也要随着gm/id改变吧。那在design的时候一般是先确定gm/id再确定Vgs的吗

taofu

how to find expression for gm/W in calculator?

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