Version 4
SHEET 1 880 680
WIRE -128 -16 -192 -16
WIRE 64 96 64 80
WIRE 64 208 64 176
WIRE 64 208 -64 208
WIRE 208 208 64 208
WIRE 304 208 272 208
WIRE -64 224 -64 208
WIRE 64 224 64 208
WIRE -112 240 -128 240
WIRE 208 240 176 240
WIRE -192 288 -192 -16
WIRE -192 288 -224 288
WIRE -112 288 -160 288
WIRE -528 336 -624 336
WIRE -384 336 -528 336
WIRE -160 336 -160 288
WIRE -160 336 -208 336
WIRE -64 336 -64 304
WIRE 64 336 64 288
WIRE 176 352 176 240
WIRE -624 384 -624 336
WIRE -304 432 -304 384
WIRE 304 432 304 208
WIRE 304 432 -304 432
WIRE -624 496 -624 464
WIRE 176 496 176 352
WIRE 176 608 176 576
FLAG 176 608 0
FLAG 64 336 0
FLAG 64 80 0
FLAG -64 336 0
FLAG -624 496 0
FLAG -528 336 clk
FLAG -128 240 0
FLAG -128 -16 pwm
IOPIN -128 -16 Out
FLAG 176 352 cpwm
SYMBOL current 64 96 R0
SYMATTR InstName I1
SYMATTR Value 1m
SYMBOL cap 48 224 R0
SYMATTR InstName C1
SYMATTR Value 10n
SYMBOL Digital\\diffschmitt 208 160 R0
SYMATTR InstName A1
SYMATTR SpiceLine Vt=0 Vh=0.1m Vhigh=1 Vlow=0
SYMATTR SpiceLine2 Td=1n
SYMBOL voltage 176 480 R0
SYMATTR InstName V1
SYMATTR Value 1
SYMBOL Digital\\dflop -304 240 R0
SYMATTR InstName A2
SYMATTR SpiceLine Ref=0.5 Vhigh=1V Vlow=0V
SYMATTR SpiceLine2 Td=5n
SYMBOL sw -64 208 R0
SYMATTR InstName S1
SYMATTR Value SW1
SYMBOL voltage -624 368 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value PULSE(0 1 0 1n 1n 20u 40u)
TEXT -440 536 Left 0 !.model sw1 sw(Ron=1 Roff=1G Vt=0.5)
TEXT -616 -88 Left 0 !.tran 0 100u 0 .1u
TEXT -608 -160 Left 0 ;Tpwm = 10us*V(cpwm)
TEXT -608 -128 Left 0 ;Right-mouse-click on the A-devices to see their parameters.