1. in Silvaco after Id-Vgs simulation in Tonyplot use "Graph function" tab. Use formula dydx(drain current,gate voltage). It will calculate gm. Then plot graph function 1 vs vgs to get gm-vgs curve. See Tonyplot manual for details

or

plot id-vgs curve in tonyplot, extract data . Use any graph plotting software such as Origin. Use differentiation to calculate gm

for query related to cogenda TCAD pls email on :[email protected]

If you want to get transconductance plot within the deck use mentioned syntax

- use saved log file from which you will get gate voltage and drain current.

-extracted data will be saved in dydx.dat

-2 in extract statement calculate 2nd derivative

extract init inf="xyz.log"

extract name="transconductance" deriv(v."gate", i."drain", 2) outfile="gm.dat"

Please explain me

# Extract gm for a PMOSFET load_file IdVg_des.plt -name DC set Vgs [get_variable_data "gate OuterVoltage" -dataset DC] set Ids [get_variable_data "drain TotalCurrent" -dataset DC] ext::AbsList -out absIds -x $Ids ext::ExtractGm -out gm -name "out" -v $Vgs -i $absIds puts "gm is [format %.3e $gm] S/um" #-> gm is 6.780e-05 S/um

what is the command to extract transconductance in Silvaco TCAD?