Version 4
SHEET 1 880 680
WIRE 176 96 64 96
WIRE 352 96 176 96
WIRE 176 144 176 96
WIRE 64 160 64 96
WIRE 352 160 352 96
WIRE 176 240 176 224
WIRE 208 240 176 240
WIRE 304 240 304 176
WIRE 304 240 288 240
WIRE 64 336 64 240
WIRE 352 336 64 336
FLAG 64 336 0
SYMBOL voltage 64 144 R0
WINDOW 3 -220 107 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V1
SYMATTR Value PWL(0 20 10m 12)
SYMBOL bv 176 128 R0
WINDOW 3 -80 159 Left 2
SYMATTR InstName B1
SYMATTR Value V=1000000*(2-I(V2))
SYMBOL res 304 224 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 1
SYMBOL pmos 304 256 M180
SYMATTR InstName M1
SYMATTR Value BSS84
SYMBOL voltage 352 240 R0
SYMATTR InstName V2
SYMATTR Value 0
TEXT 30 360 Left 2 !.tran 0 10m 0 10u