MOSFET scaling effects

[venkata]

Hai
I want to know which are the capacitances that wll be effected by scaling of a transister.What are the new capacitances that will come into picture.

 

[eng_Semi]

When u increase the transistor size, increase W/L, the parasitic capacitance are increasing, like cgs-cgd-cgb-...

Do u face a certain problem ??

 

[noiseless]

I believe CGDO will become larger. As to new para caps, it depends on the process.

 

[estradasphere]

actually all the capacitances (Cgd, Cgs, Cdb, Csb, Cgd etc.) including the parasitic overlap ones depend on the scaling.

 

[Puppet1]

check razavi cmos book.

talks about scaling with examples including what is scaled.

 

[piao]

the cap will be smaller with the scaling down, but the impact will be bigger.

 

[mmohsen]

actually all the capacitances (Cgd, Cgs, Cdb, Csb, Cgd etc.) including the parasitic overlap ones depend on the scaling.

i agree with this reply

piao wrote:
the cap will be smaller with the scaling down, but the impact will be bigger.

which impact ???

regards

 

[yeechyan]

Smaller drain current, resulting in smaller transconductance.