Hello, i am using the model shown bellow in LTSPICE simulation.Is the a way using simulation to find the dgs and cgg params?
Thanks.

https://sanjayvidhyadharan.in/Downloads/tsmc_180_nm/tsmc018.lib

 

I think you meant gds. The quantity dgs does not appear to be a MOSFET property. A discussion of gds as the inverse of rout is contained in the following article.

https://en.wikipedia.org/wiki/MOSFET

As for cgg, it appears so be the parallel combination of cgs with the series combination of cgd and cds.
Also remember that cds gets shorted out when the MOSFET is on.
I hope that helps.

 

Hello Papabravo, gds is the derivative of the current by vds.
for Ft plot ineed the Cgg i have found another formula
my spice model is shown bellow.
so Cgg=Cgs0+Cgd0+Cgb0
in my model its
+CGDO = 8.23E-10 CGSO = 8.23E-10 CGBO = 1E-12
Alll the capacitances are in parralell, as shown bellow.
I am correct?
Thanks.


CGSO Gate-source overlap
capacitance/channel width
CGDO Gate-drain overlap
capacitance/channel width
CGBO Gate-bulk overlap
capacitance/channel width

https://sanjayvidhyadharan.in/Downloads/tsmc_180_nm/tsmc018.lib
https://www.seas.upenn.edu/~jan/spice/spice.MOSparamlist.html

 

I could not find a datasheet for that Mosfet. The Model has no minimum and maximum specs, probably just "typical" specs.
The DC simulation here does not care about capacitance.

 

I could not find a datasheet for that Mosfet. The Model has no minimum and maximum specs, probably just "typical" specs.
The DC simulation here does not care about capacitance.

I don't think datasheets for those exist. At least I have never seen a datasheet from a foundry.

 

If I ever need to order a few million custom Mosfets made then I need to know their guaranteed minimum and maximum specs.

 

If I ever need to order a few million custom Mosfets made then I need to know their guaranteed minimum and maximum specs.

I'm not sure it works that way, but I could be wrong. Anybody out there ever seen a publicly available datasheet for a CMOS process node?