How to find CMOS capacitances?

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Re: CMOS capacitances

HI,

For Cgd, it depends upon basing condition of the MOSFET (PMOS/NMOS)
When Vds < Vgs-Vt, you can assume Cgs = Cgd = 1/2 Cgtotal
Where Cgtotal = W*L*Cox
When Vds > Vgs-Vt, you can assume Cgs =0 and Cgd = 2/3 Cgtotal

May this can help!

Dar
 

CMOS capacitances

check out the book by Sung-Mo Kang and Yusuf Leblebici. it has given a very good explanation to find out the capacitances.
 

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