Version 4
SHEET 1 1164 680
WIRE -16 112 -96 112
WIRE 160 112 64 112
WIRE 208 112 160 112
WIRE 160 160 160 112
WIRE 160 288 160 240
WIRE 208 288 160 288
WIRE -96 320 -96 112
WIRE 160 320 160 288
WIRE -96 432 -96 400
WIRE 160 432 160 400
WIRE 160 432 -96 432
WIRE -96 448 -96 432
FLAG -96 448 0
FLAG 208 112 A
FLAG 208 288 K
SYMBOL bv 160 144 R0
SYMATTR InstName BVC
SYMATTR Value V=idt(I(VC)/(CAK/(1+V(A,K))),1)
SYMBOL voltage 160 304 R0
SYMATTR InstName VC
SYMATTR Value 0
SYMBOL res -32 128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL voltage -96 304 R0
WINDOW 3 -21 201 Left 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value PULSE(0 5 0 1n 1n 100n)
TEXT -80 -32 Left 2 !.param CAK=100p
TEXT -80 0 Left 2 !.tran 0 200n 0 1n