Version 4
SHEET 1 2740 956
WIRE -400 -384 -400 -400
WIRE 752 -368 752 -384
WIRE -464 -336 -496 -336
WIRE -352 -336 -384 -336
WIRE -688 -304 -688 -320
WIRE -640 -304 -688 -304
WIRE -688 -288 -688 -304
WIRE 640 -288 592 -288
WIRE 912 -288 896 -288
WIRE 928 -288 912 -288
WIRE 592 -208 592 -288
WIRE -224 -176 -224 -208
WIRE -80 -176 -80 -208
WIRE 48 -176 48 -208
WIRE -784 -112 -784 -128
WIRE -832 -96 -864 -96
WIRE -496 -96 -496 -336
WIRE -448 -96 -496 -96
WIRE -352 -96 -352 -336
WIRE -352 -96 -384 -96
WIRE -272 -96 -352 -96
WIRE -192 -96 -272 -96
WIRE 592 -96 592 -128
WIRE 1120 -96 1120 -128
WIRE -1232 -32 -1344 -32
WIRE -832 -32 -832 -48
WIRE -832 -32 -1232 -32
WIRE -352 -32 -352 -96
WIRE -784 -16 -784 -32
WIRE -624 -16 -784 -16
WIRE -496 -16 -496 -96
WIRE -496 -16 -544 -16
WIRE -400 -16 -496 -16
WIRE 0 -16 0 -32
WIRE -1344 0 -1344 -32
WIRE -864 0 -864 -96
WIRE -864 0 -896 0
WIRE -784 0 -784 -16
WIRE -48 0 -80 0
WIRE -832 16 -832 -32
WIRE -400 32 -416 32
WIRE -192 48 -192 -96
WIRE -80 48 -80 0
WIRE -80 48 -192 48
WIRE -864 64 -864 0
WIRE -832 64 -864 64
WIRE -416 64 -416 32
WIRE 720 64 688 64
WIRE 912 64 880 64
WIRE 1072 64 1040 64
WIRE 1264 64 1232 64
WIRE -352 80 -352 48
WIRE 0 80 0 64
WIRE 160 80 0 80
WIRE 272 80 160 80
WIRE -48 96 -48 48
WIRE -48 96 -192 96
WIRE 0 96 0 80
WIRE -1344 112 -1344 80
WIRE -48 112 -48 96
WIRE 656 112 624 112
WIRE 720 112 656 112
WIRE 912 112 896 112
WIRE 1072 112 1040 112
WIRE 1264 112 1248 112
WIRE -192 128 -192 96
WIRE -1024 144 -1056 144
WIRE -80 160 -80 48
WIRE -48 160 -80 160
WIRE -1184 176 -1280 176
WIRE -1024 176 -1184 176
WIRE -784 192 -784 80
WIRE -784 192 -848 192
WIRE -1280 208 -1280 176
WIRE -1024 208 -1072 208
WIRE 0 208 0 176
WIRE -1280 320 -1280 288
WIRE 720 336 688 336
WIRE 912 336 880 336
WIRE 1072 336 1040 336
WIRE 1264 336 1232 336
WIRE 720 384 688 384
WIRE 912 384 896 384
WIRE 1072 384 1040 384
WIRE 1264 384 1248 384
FLAG -352 80 0
FLAG -224 -176 0
FLAG -224 -288 Vref
FLAG -80 -176 0
FLAG -80 -288 VDD
FLAG 48 -176 0
FLAG 48 -288 Vclk
FLAG -1280 320 0
FLAG -272 -96 Vc
FLAG -416 64 0
FLAG -1184 176 Vin
FLAG 1120 -96 0
FLAG 1120 -208 VADC
FLAG 448 32 VDD
FLAG -688 -208 0
FLAG -688 -400 VDD
FLAG -640 -304 Vtrip
FLAG 912 64 b0
FLAG 912 112 bi0
FLAG 1040 112 bi1
FLAG 1264 64 b2
FLAG 1264 112 bi2
FLAG 1040 384 bi2
FLAG 1264 336 b3
FLAG 1264 384 bi3
FLAG -1056 144 0
FLAG 0 -32 VDD
FLAG 0 208 0
FLAG -400 -400 Vtrip
FLAG 688 64 bi0
FLAG 1040 64 bi2
FLAG 1040 336 bi3
FLAG 912 336 b1
FLAG 912 384 bi1
FLAG 688 384 bi0
FLAG 688 336 bi1
FLAG 1616 240 q1
FLAG 1616 288 q0
FLAG 1616 144 q3
FLAG 1616 192 q2
FLAG 1392 288 b0
FLAG 1392 240 b1
FLAG 1392 192 b2
FLAG 1392 144 b3
FLAG 1504 80 VDD
FLAG 272 112 Enable
FLAG 160 80 Vcomp
FLAG 592 -96 0
FLAG 592 -288 Vsamp
FLAG 752 -384 VDD
FLAG 912 -288 Enable
FLAG 272 144 Vclk
FLAG 656 112 Vcnt
FLAG -192 128 0
FLAG -784 -128 Vref
FLAG -896 0 Vtrip
FLAG -1344 112 0
FLAG -1232 -32 Vof
FLAG -784 192 Vsh
FLAG 800 160 Vsamp
FLAG 1152 160 Vsamp
FLAG 800 432 Vsamp
FLAG 1152 432 Vsamp
FLAG 1504 352 Vsamp
FLAG -1072 208 Vsamp
FLAG -448 -384 Vsamp
SYMBOL e2 -352 -48 R0
SYMATTR InstName E1
SYMATTR Value 100MEG
SYMBOL cap -384 -112 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName C1
SYMATTR Value 10p
SYMBOL res -528 -32 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 90k
SYMBOL voltage -224 -304 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vref
SYMATTR Value 1
SYMBOL voltage -80 -304 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName VDD
SYMATTR Value 1
SYMBOL voltage 48 -304 R0
WINDOW 0 36 42 Left 0
WINDOW 3 35 69 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vclk
SYMATTR Value PULSE(0 1 0 1p 1p 31.25n 62.5n)
SYMBOL voltage -1280 192 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vin
SYMATTR Value SINE(0.5 0.5 10k)
SYMBOL bv 1120 -224 R0
SYMATTR InstName B1
SYMATTR Value V=(V(q0)/16 + V(q1)/8 + V(q2)/4 + V(q3)/2)
SYMBOL res -704 -416 R0
SYMATTR InstName R2
SYMATTR Value 100MEG
SYMBOL res -704 -304 R0
SYMATTR InstName R3
SYMATTR Value 100MEG
SYMBOL Digital\\dflop 800 16 R0
SYMATTR InstName A1
SYMBOL Digital\\dflop 1152 16 R0
SYMATTR InstName A3
SYMBOL Digital\\dflop 1152 288 R0
SYMATTR InstName A4
SYMBOL SpecialFunctions\\sample -944 176 R0
SYMATTR InstName A5
SYMBOL sw 0 80 M180
WINDOW 3 24 -12 Left 0
WINDOW 38 39 67 Left 0
WINDOW 0 38 33 Left 0
SYMATTR Value ""
SYMATTR SpiceModel switmod
SYMATTR InstName S5
SYMBOL sw 0 192 M180
WINDOW 3 24 -12 Left 0
WINDOW 38 39 67 Left 0
WINDOW 0 38 33 Left 0
SYMATTR Value ""
SYMATTR SpiceModel switmod
SYMATTR InstName S6
SYMBOL Digital\\dflop 800 288 R0
SYMATTR InstName A11
SYMBOL 4_bit_register 1424 320 R0
SYMATTR InstName X7
SYMBOL voltage 592 -224 R0
WINDOW 0 36 42 Left 0
WINDOW 3 35 69 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vsamp
SYMATTR Value PULSE(0 1 62.5n 1p 1p 31.25n 2u)
SYMBOL Ideal_inverter 672 -352 R0
SYMATTR InstName X2
SYMBOL Ideal_NAND_3 224 128 R0
SYMATTR InstName X3
SYMBOL sw -784 -16 M180
WINDOW 3 24 -12 Left 0
WINDOW 38 39 67 Left 0
WINDOW 0 38 33 Left 0
SYMATTR Value ""
SYMATTR SpiceModel switmod
SYMATTR InstName S2
SYMBOL sw -784 96 M180
WINDOW 3 24 -12 Left 0
WINDOW 38 39 67 Left 0
WINDOW 0 38 33 Left 0
SYMATTR Value ""
SYMATTR SpiceModel switmod
SYMATTR InstName S3
SYMBOL sw -368 -336 R90
WINDOW 3 24 -12 Left 0
WINDOW 38 39 67 Left 0
WINDOW 0 38 33 Left 0
SYMATTR Value ""
SYMATTR SpiceModel switmod
SYMATTR InstName S1
SYMBOL voltage -1344 -16 R0
WINDOW 0 36 42 Left 0
WINDOW 3 35 69 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName Vof
SYMATTR Value PULSE(0 1 93.75n 1p 1p 1u 2u)
TEXT -576 272 Left 0 !.tran 0 105u 5u 1n uic
TEXT -576 240 Left 0 !.model switmod SW
TEXT 840 480 Left 0 ;4-bit Ripple Counter
TEXT 1304 -168 Left 0 ;Digital output
TEXT -72 272 Left 0 ;Comparator
TEXT -1024 320 Left 0 ;Input
TEXT -464 120 Left 0 ;Integrator
TEXT 352 200 Left 0 ;Control Logic
TEXT 200 -416 Left 0 ;Plot Vin and VADC
TEXT -1024 -144 Left 0 ;Input Switch