MOS output characteristics with and witout drain series resistance

examples/various/nmos_out_BSIM330.sp

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+*****  NMOS Transistor BSIM3 (Id-Vds) with Rd ***
+
+M1 2 1 3 4 n1 W=1u L=0.35u Pd=1.5u Ps=1.5u ad=1.5p as=1.5p
+vgs 1 0 3.5 
+vds 2 0 0.1 
+vss 3 0 0
+vbs 4 0 0
+
+* drain series resistor
+R2 2 22 1k
+M2 22 1 32 4 n1 W=1u L=0.35u Pd=1.5u Ps=1.5u ad=1.5p as=1.5p
+vss2 32 0 0
+
+
+.options Temp=27.0
+
+* BSIM3v3.3.0 model with modified default parameters 0.18µm
+.model n1 nmos level=49 version=3.3.0 tox=3.5n nch=2.4e17 nsub=5e16 vth0=0.15
+.model p1 pmos level=49 version=3.3.0 tox=3.5n nch=2.5e17 nsub=5e16 vth0=-0.15
+
+.control
+set xgridwidth=2
+set xbrushwidth=3
+dc vds 0 2 0.05 vgs 0 2 0.4
+set nolegend
+plot vss#branch title 'Drain current versus drain voltage' xlabel 'Drain voltage' ylabel 'Drain current'
+unset nolegend
+set color0=white
+plot vss2#branch vs v(22) title 'Series resistor: Drain current versus drain voltage' xlabel 'Drain voltage' ylabel 'Drain current'
+.endc
+
+.end
+
+
+
+
+