Version 4
SHEET 1 940 680
WIRE -128 144 -144 144
WIRE 320 144 -128 144
WIRE 400 160 384 160
WIRE 320 176 208 176
WIRE -128 224 -128 144
WIRE 208 224 208 176
WIRE -128 320 -128 304
WIRE 208 320 208 304
FLAG 208 320 0
FLAG 400 160 out
IOPIN 400 160 Out
FLAG -128 320 0
FLAG -144 144 Input
IOPIN -144 144 In
SYMBOL voltage 208 208 R0
WINDOW 3 38 97 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(0 1 0 {0.5/freq} {0.5/freq} 1p {1/freq})
SYMATTR InstName V1
SYMBOL Digital\\diffschmtbuf 320 96 R0
WINDOW 3 3 119 Left 0
SYMATTR Value ref=0 vlow=0 vhigh={vout} td=1n trise=1p tfall=1p
SYMATTR InstName A1
SYMBOL voltage -128 208 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value PULSE(0 1 0 1m 0 0 1m)
TEXT 264 384 Left 0 !.params freq=100k vout=1V
TEXT 80 384 Left 0 !.tran 1m