Version 4
SHEET 1 880 680
WIRE 224 48 160 48
WIRE 384 48 304 48
WIRE 160 128 160 48
WIRE 384 128 384 48
WIRE 112 208 16 208
WIRE 160 256 160 224
WIRE 384 256 384 208
WIRE 16 304 16 288
FLAG 160 256 0
FLAG 384 256 0
FLAG 16 304 0
FLAG 160 48 DS
SYMBOL voltage 384 112 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PWL(0 0 1 4)
SYMBOL res 320 32 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName Rd
SYMATTR Value 1
SYMBOL nmos 112 128 R0
SYMATTR InstName M1
SYMATTR Value 2N7002
SYMBOL voltage 16 192 R0
WINDOW 0 38 45 Left 2
SYMATTR InstName V2
SYMATTR Value {Vg}
TEXT 232 304 Left 2 !.tran 1s
TEXT -160 360 Left 2 !.step param Vg 3.5 5 .5