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How to calculate unCox ?

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shaq

shaq

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uncox

Hello everyone!

Can anyone tell me how to calculate µnCox by using table 2.1 of page 37 in "Design of Analog CMOS Integrated Circuits" which is written by Razavi ?
 

uncox silicon

as in your file ,
for nmos Un=U0=350
for pmos Up=100

Cox=εox/tox,
where εox is the dielectric constant of the silicon dioxide(approximately 3.45e-5pf/um),tox is the thickness of the oxide.
 

εox = ε0 * εr(SiO2) = 8.854e-6 pF/µm * 3.9 = 34.5e-6 pF/µm = 34.5 aF/µm
 

whats UnCox in 90nm?
 

can you get me a value? , because i m can not find it in library.

---------- Post added at 16:01 ---------- Previous post was at 15:52 ----------

can you get me a value? , because i m can not find it in library.
 

u is a surface mobility and will vary with gate processing,
at least as much as bulk doping.

At very short channels velocity saturation is a real thing
and at high channel fields the u0 may not be what defines
the conduction.

So you may find u0 values that make the model fit, but
diverge from classical values.
 

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