Anyone on variation analysis by using hspice?

[shaq]

.local_variation

Dear all,

Does someone have any experience of variation analysis by using Hspice?

If you have, can you give me some examples or files.

Thanks so much!!!!

 

[xuel]

hspice dcmatch

.variation
.local_variation
nmos nch vth0='4e-9/sqrt(e(w)*e(l)*e(m))'
pmos pch vth0='4e-9/sqrt(e(W)*e(L)*e(M))'
.end_local_variation
.end_variation

.dcmatch v(out) threshold=0
those statements in .variation define the threshold variation of nch and pch, .dcmatch statement simulate the offset at out node, set threshold=0 will display all the devices contribute to the offset.

 

[yjkwon57]

variation in hspice

You can use Telegen's theorem, which is very efficient.

 

[shaq]

variation hspice

You can use Telegen's theorem, which is very efficient.

Hey yjkwon57,

I guess you wanna say Pelgrom's theorem.

I have read his paper, but I don't know how to do this variation analysis in hspice.

I'll try the way of xuel said.

 

[sowmya005]

hspice .variation

HI,
i need an example for performing the montecarlo simulation by using the global variation and local variation..
pl help me....
how can we know the values of the variables say for example vth0 or u0 at a particular simulation?

 

[mitgrace]

Re: hspice dcmatch

.variation
.local_variation
nmos nch vth0='4e-9/sqrt(e(w)*e(l)*e(m))'
pmos pch vth0='4e-9/sqrt(e(W)*e(L)*e(M))'
.end_local_variation
.end_variation

.dcmatch v(out) threshold=0
those statements in .variation define the threshold variation of nch and pch, .dcmatch statement simulate the offset at out node, set threshold=0 will display all the devices contribute to the offset.

Dear Sir :
How do you know the number : 4e-9 in Vth0 formula ?
Thanks a lot.


mitgrace