Version 4
SHEET 1 1156 680
WIRE -80 48 -160 48
WIRE 16 48 -80 48
WIRE 16 80 16 48
WIRE -160 96 -160 48
WIRE -80 112 -80 48
WIRE -16 112 -80 112
WIRE -64 128 -128 128
WIRE -64 160 -64 128
WIRE 176 160 -64 160
WIRE 16 176 16 144
WIRE -160 192 -160 160
WIRE 16 256 16 240
WIRE 32 256 16 256
WIRE 176 272 176 160
WIRE 176 272 144 272
WIRE 240 272 176 272
WIRE -160 288 -160 256
WIRE 16 288 16 256
WIRE 16 288 -160 288
WIRE 32 288 16 288
WIRE -160 320 -160 288
WIRE 16 320 16 288
WIRE -160 400 -160 384
WIRE 16 400 16 384
WIRE 16 400 -160 400
WIRE 96 400 16 400
WIRE 128 400 96 400
WIRE 224 400 192 400
WIRE 224 432 224 400
FLAG 224 432 0
FLAG 240 272 Out
IOPIN 240 272 Out
FLAG 96 400 Ramp
SYMBOL Dig_Add\\CD4xxx\\cd4093b 80 208 R0
WINDOW 0 -53 64 Left 0
WINDOW 3 22 89 Left 0
SYMATTR InstName U1
SYMATTR SpiceLine VDD={Vdd}  SPEED=1.0  TRIPDT=5e-9
SYMBOL cap 128 416 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName Ct
SYMATTR Value 1n
SYMATTR SpiceLine Rpar=1e9
SYMBOL diode -176 320 R0
WINDOW 0 36 35 Left 0
WINDOW 3 20 62 Left 0
SYMATTR InstName D3
SYMATTR Value 1N914
SYMBOL diode 32 384 R180
WINDOW 0 -22 61 Left 0
WINDOW 3 -81 32 Left 0
SYMATTR InstName D4
SYMATTR Value 1N914
SYMBOL Robertugo\\Pote -144 64 M0
WINDOW 0 -54 37 Left 0
WINDOW 3 -68 106 Left 0
WINDOW 123 -53 126 Center 0
SYMATTR InstName Duty
SYMATTR Value Rt=1e5
SYMATTR Value2 Set=cursor
SYMBOL diode -176 192 R0
WINDOW 0 40 40 Left 0
WINDOW 3 36 62 Left 0
SYMATTR InstName D1
SYMATTR Value 1N914
SYMBOL diode 32 240 R180
WINDOW 0 -22 61 Left 0
WINDOW 3 -81 32 Left 0
SYMATTR InstName D2
SYMATTR Value 1N914
SYMBOL Robertugo\\Pote 0 48 R0
WINDOW 0 -53 89 Left 0
WINDOW 3 -71 18 Left 0
WINDOW 123 -40 43 Center 0
SYMATTR InstName Frec
SYMATTR Value Rt=1e4
SYMATTR Value2 Set=.1
TEXT 332 402 Left 0 !.tran 1m uic
TEXT 328 96 Left 0 !.params: Vdd 12\n.step param Cursor .05 .95 .15\n.meas tran ta FIND time WHEN V(out)={Vdd/2} td=.2m rise=1\n.meas tran tb FIND time WHEN V(out)={Vdd/2} td=.2m rise=11\n.meas tran Frec PARAM 10/(tb-ta)\n.Meas tran Tc FIND time WHEN V(Out)={Vdd/2} td=.2m fall=1\n.Meas tran Td FIND time WHEN V(Out)={Vdd/2} td=.2m fall=2\n.Meas tran T1 Param  (Tc-Ta)\n.Meas tran T2  Param  (Td-Ta)\n.Meas tran Ton Param If (T1>0, T1, T2)\n.Meas tran Duty% Param  Ton*Frec*100