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What is gm called in tsmc technology?

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guow06

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Usually you can see the gm of a transistor in ADE when you ran a op analysis. But in the tsmc technology, I can not find it. I am wondering if it is called something else.
 

A couple of years ago i was working on a TSMC pdk and had the same issue.I couldn't see it on schematic annotation after dc analysis.The solution is to find it via the Direct Plot ADE L menu and the option Print DC Operating Points.Then hit on the desired transistor and from the list that comes up search for gm value.Additionally you can find it's value from Tools->Results Browser.
 
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    guow06

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Generally gm is called transconductance. Depending on the model level used it's sometimes called GMO or LX7 (DC gate transconductance). You can always get it by the equation gm = δ(Id)/δ(Vgs) .
Use the calculator's deriv function to plot gm.
 

gm is gm, but the displaying of OP params is defined by some mapping to the
cdsParam() texts placed in the device symbols - if they are there at all, which
they aren't in the symbols I hand-draw. Maybe TSMC has selected different
params, or neglected to select any, or omitted the texts (look at analogLib
nmos4 to see what's generic).

Now too, I've seen this chain get broken when people employ a subcircuit
model hierarchy (e.g. your FET has things like gate resistor / inductor between
its terminals and the outside world). The naming of (say) M0 is really not that
simple, becomes something like M0/Mcore (with M0/Lgate and M0/Rgate along
for the ride) and the name-mapping gets "disconnected".
 

Thanks a lot. I was looking for it with the option Print Model Parameters.
jimito13 said:
A couple of years ago i was working on a TSMC pdk and had the same issue.I couldn't see it on schematic annotation after dc analysis.The solution is to find it via the Direct Plot ADE L menu and the option Print DC Operating Points.Then hit on the desired transistor and from the list that comes up search for gm value.Additionally you can find it's value from Tools->Results Browser.
Click to expand...
 

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