Dear Md Hasnain Ansari,

Solve one by one.

First ID-VG:

Generate one .str file by solving a fixed VD and vary the VG afterward as you want and save it as a .log file.

For ID-VD:

Save .str file for a VG, vary the VD and save your .log file.

Finally, plot these log files using separate tony plot statements.

Regards

solve init

# calculate Id-Vgs

save outf=cv_A35.str

output con.band val.band e.mobility h.mobility

method gummel newton trap itlimit=20 maxtrap=10

solve vdrain=0.2 outf=cv_A_33.bin

# Calculate ID-VG characteristics

load inf=cv_A_33.bin

log outf=cv_35.log

solve vgate=0 vstep=-0.2 vfinal=-6 name=gate ac freq=1e6

tonyplot cv_35.log

Look at the examples of SILVACO, u will get ur answer.