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    uncox

    Hello everyone!

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

    •   Alt31st October 2005, 10:36

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    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.



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    How to calculate unCox ?

    εox where?



    •   Alt1st June 2010, 15:04

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    Re: How to calculate unCox ?

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



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    Re: How to calculate unCox ?

    whats UnCox in 90nm?



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    Re: How to calculate unCox ?

    Quote Originally Posted by mmsh View Post
    whats UnCox in 90nm?
    See e.g. this PTM model card.
    BTW: Values given there in SI units.



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    Re: How to calculate unCox ?

    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.



    •   Alt11th July 2011, 16:01

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    Re: How to calculate unCox ?

    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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