Version 4
SHEET 1 2272 1576
WIRE 112 880 64 880
WIRE 368 912 256 912
WIRE 528 912 432 912
WIRE 560 912 528 912
WIRE 112 944 -64 944
WIRE 736 944 672 944
WIRE 800 944 736 944
WIRE 1120 960 928 960
WIRE 1168 960 1120 960
WIRE 1312 960 1248 960
WIRE 1456 960 1312 960
WIRE 1664 960 1456 960
WIRE -64 976 -64 944
WIRE 528 976 528 912
WIRE 800 976 528 976
WIRE 1120 992 1120 960
WIRE 1312 1008 1312 960
WIRE 1456 1008 1456 960
WIRE 672 1024 672 944
WIRE -64 1088 -64 1056
WIRE 1312 1120 1312 1088
WIRE 1456 1120 1456 1072
WIRE 1456 1120 1312 1120
WIRE 672 1136 672 1104
WIRE 1120 1152 1120 1072
WIRE 1456 1216 1456 1120
WIRE 1456 1360 1456 1280
FLAG 560 912 out
FLAG -64 1088 0
FLAG 672 1136 0
FLAG 1120 1152 0
FLAG 1664 960 toVCO
IOPIN 1664 960 Out
FLAG 64 880 toVCO
IOPIN 64 880 In
FLAG 736 944 Fref
FLAG 1456 1360 0
SYMBOL SPECIALFUNCTIONS\\MODULATE 112 880 R0
WINDOW 0 37 -55 Left 0
WINDOW 3 55 119 Center 0
SYMATTR InstName A1
SYMATTR Value space=20K mark=200K
SYMBOL DIGITAL\\SCHMTBUF 368 848 R0
WINDOW 0 3 36 Left 0
WINDOW 3 22 97 Center 0
SYMATTR InstName A4
SYMATTR Value Vt=0.01u Vh=0.1m vhigh=5
SYMBOL voltage -64 960 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL Digital\\phidet 832 960 R0
SYMATTR InstName A3
SYMBOL voltage 672 1008 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vref
SYMATTR Value PULSE(0 1 1u 10n 10n 10u 20u)
SYMBOL res 1136 1088 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R1
SYMATTR Value 100k
SYMBOL res 1264 944 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res 1328 1104 R180
WINDOW 0 36 76 Left 0
WINDOW 3 36 40 Left 0
SYMATTR InstName R3
SYMATTR Value 470
SYMBOL cap 1440 1008 R0
SYMATTR InstName C1
SYMATTR Value 1n
SYMBOL cap 1440 1216 R0
SYMATTR InstName C2
SYMATTR Value 10n
TEXT 288 1144 Left 0 !.tran 0 3000u 100u
TEXT -24 624 Left 0 ;Mark is the frequency when the FM input is at 1V \nspace is the frequency when the input is at 0V
TEXT -80 752 Left 0 !.inc "C:\\Program Files\\LTC\\LTspiceIV\\lib\\sym\\Extra\\CD4000\\CD4000.lib"