monte carlo simulation for mos

[subhashrewa]

monte carlo

plz tell me how to do monte carlo simulation for mos.



thanks.

 

[ankitgarg0312]

Re: monte carlo

for performing monte carlo simulations using hspice

u have to write a variation block that will define variablity u are expecting in different parameters of your device.
e.g. vth of devices vary by 10mv
mobility varies by 10%

after writing variation block use command

.TRAN 10NS 1US SWEEP MONTE=10

normally variation in parameters are provided by foundries but u can also write ur own equations to model worst case variation

hope this helps

 

[subhashrewa]

Re: monte carlo

man how can i do analysis throught COSMOS SCOPE, what u written netlist of monte in hspice.

Added after 6 minutes:

.TRAN 10NS 1US SWEEP MONTE=10 ,
this is simulated but iam unable to plot it in CSCOPE, for the analysis.

 

[ankitgarg0312]

cscope is for waveform viewing only..
simulation has to be done through a simulator eldo/hspice/spectre ...

if u are using hspice for simulations:
are u getting a .tr0 file generated as a output from hspice??
that file can be loaded in cscope.
if tr0 is not getting generated then use in your netlist...
.option post
this will dump a tr0 file and that file will have result for monte carlo sims.

let me know which simulator u are using, and if possible upload netlist for better understanding of issue getting faced..

 

[subhashrewa]

plz currect the netlist , for monte simulation in Vth variation.

 

[ankitgarg0312]

sorry,
i cant see any netlist here :|

 

[subhashrewa]

can u give me the netlist of cmos inverter with monte carlo analysis having the Vth variable .plz

 

[subhashrewa]

i got .tr file but i didnt get the output, when i follow u, plz tel me the complete netlist for vth or Weff , variation in leakage currect for cmos inverter. plz, that may clear my prblm. or plz give me simple netlist of cmos inverter , having monte carlo analysis. thank u.

 

[ankitgarg0312]

as u are using hspice , go in installation direcotry of hspice
you will find demo directory in installation..
this directory has samples for monte carlo runs in variability section of demos.