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
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..
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.
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.