Using fingers in Hspice

Status
Not open for further replies.
D

dream_taker

Junior Member level 1
Joined
Sep 28, 2004
Messages
15
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
137
If we use fingering in layout the Drain/source cap is reduced by that factor. Is it the same case when we use Hspice. Imagine I set M=2 in hspice which means I am using a finger of two, will hspice consider half the cap at Drain/Source?

We also give diffusion area and diffuison periphery values in schematic for a transistor. So which will Hspice takes into account ?
 

Yes. The Hspice can do it. and it work like that
 

how does hspice define PS PD AS AD for different layout purpose?
Fox example:
we try to plot a pmos: MP0 D G S B pch w=1u l=0.18u m=2
One way, we draw two pmos(2/0.18) with drain sharing.
So PS=2*PD AS=2*AD for each pmos.
Also, we can draw two pmos separately.
So PS=PD AS=AD for each pmos.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…