Version 4 SHEET 1 1428 720 WIRE -1408 -304 -1424 -304 WIRE -1328 -304 -1344 -304 WIRE -1232 -304 -1248 -304 WIRE -1120 -304 -1152 -304 WIRE -1024 -304 -1056 -304 WIRE -800 -304 -832 -304 WIRE -704 -304 -736 -304 WIRE -496 -304 -544 -304 WIRE -384 -304 -432 -304 WIRE 64 -304 64 -320 WIRE -1152 -272 -1152 -304 WIRE -832 -272 -832 -304 WIRE -544 -272 -544 -304 WIRE -1072 -256 -1088 -256 WIRE -752 -256 -768 -256 WIRE -432 -256 -448 -256 WIRE -176 -256 -176 -272 WIRE -1088 -240 -1088 -256 WIRE -768 -240 -768 -256 WIRE -448 -240 -448 -256 WIRE -240 -240 -240 -256 WIRE -208 -240 -240 -240 WIRE -1504 -224 -1504 -304 WIRE -1232 -224 -1232 -304 WIRE -1152 -224 -1152 -272 WIRE -1152 -224 -1232 -224 WIRE -1120 -224 -1152 -224 WIRE -832 -224 -832 -272 WIRE -800 -224 -832 -224 WIRE -544 -224 -544 -272 WIRE -544 -224 -576 -224 WIRE -480 -224 -544 -224 WIRE -384 -224 -384 -304 WIRE -368 -224 -384 -224 WIRE -240 -224 -240 -240 WIRE -240 -224 -288 -224 WIRE -128 -224 -144 -224 WIRE -32 -224 -48 -224 WIRE 176 -224 160 -224 WIRE 208 -224 176 -224 WIRE 320 -224 288 -224 WIRE 368 -224 320 -224 WIRE 496 -224 448 -224 WIRE 544 -224 496 -224 WIRE -1024 -208 -1024 -304 WIRE -1024 -208 -1056 -208 WIRE -992 -208 -1024 -208 WIRE -896 -208 -912 -208 WIRE -832 -208 -832 -224 WIRE -832 -208 -896 -208 WIRE -704 -208 -704 -304 WIRE -704 -208 -736 -208 WIRE -672 -208 -704 -208 WIRE -384 -208 -384 -224 WIRE -384 -208 -416 -208 WIRE -208 -208 -240 -208 WIRE -1120 -192 -1152 -192 WIRE -672 -192 -672 -208 WIRE -576 -192 -576 -224 WIRE -576 -192 -592 -192 WIRE -480 -192 -496 -192 WIRE -1312 -176 -1328 -176 WIRE -1232 -176 -1232 -224 WIRE -176 -176 -176 -192 WIRE -896 -80 -896 -208 WIRE -896 -80 -912 -80 WIRE -576 -80 -576 -192 WIRE -576 -80 -592 -80 WIRE -688 -64 -672 -80 WIRE -1392 80 -1424 80 WIRE -1296 80 -1392 80 WIRE -1296 96 -1296 80 WIRE -1536 144 -1536 80 WIRE -1424 144 -1424 80 WIRE -1152 192 -1152 176 WIRE -1296 208 -1296 176 WIRE -1184 208 -1296 208 WIRE -1296 224 -1296 208 WIRE -1152 224 -1184 224 WIRE -1088 224 -1120 224 WIRE -1056 224 -1088 224 WIRE -1184 240 -1216 240 WIRE -1152 256 -1152 224 WIRE -1216 304 -1216 240 WIRE -1088 304 -1088 224 WIRE -1088 304 -1216 304 WIRE -1536 336 -1536 224 WIRE -1424 336 -1424 224 WIRE -1296 336 -1296 304 FLAG -1504 -224 0 FLAG -1424 336 0 FLAG -1536 336 0 FLAG -1392 80 V+ FLAG -1072 -256 V+ FLAG -1152 -192 cmp FLAG -240 -208 cmp FLAG -1056 224 cmp FLAG 176 -224 q FLAG -1328 -176 q FLAG -1536 80 clk FLAG -32 -192 clk FLAG -1088 -176 0 FLAG -176 -272 0 FLAG -1296 336 0 FLAG -1152 256 V+ FLAG -176 -176 V+ FLAG -1152 176 0 FLAG 64 -320 V+ FLAG 64 -80 V+ FLAG 320 -160 0 FLAG 496 -160 0 FLAG 544 -224 out FLAG -1152 -272 step1 FLAG -752 -256 V+ FLAG -800 -192 cmp FLAG -992 -80 neg_q FLAG -768 -176 0 FLAG -832 -272 step2 FLAG -544 -272 step3 FLAG 160 -160 neg_q FLAG -432 -256 V+ FLAG -496 -192 cmp FLAG -688 -64 q FLAG -448 -176 0 FLAG -240 -256 step4 SYMBOL voltage -1408 -304 R90 WINDOW 0 32 56 VTop 0 WINDOW 3 -60 37 VBottom 0 WINDOW 123 0 0 Left 0 WINDOW 39 101 62 VTop 0 SYMATTR InstName V2 SYMATTR Value SINE(0 0.2 10k) SYMATTR SpiceLine Rser=50 SYMBOL res -1344 -288 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R1 SYMATTR Value 430 SYMBOL res -1328 -160 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R2 SYMATTR Value 4.3k SYMBOL cap -1120 -288 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 91 35 VBottom 0 SYMATTR InstName C1 SYMATTR Value 1n SYMBOL voltage -1424 128 R0 WINDOW 0 17 144 Left 0 WINDOW 3 43 55 Left 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR InstName V3 SYMATTR Value 3.3 SYMBOL voltage -1536 128 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 0 39 163 Left 0 WINDOW 3 -14 -155 Left 0 SYMATTR InstName V4 SYMATTR Value PULSE(0 3.3 0 0 0 10n 20n) SYMBOL Opamps\\LT1807 -176 -160 M180 WINDOW 3 -39 -39 Left 0 WINDOW 0 -21 161 Left 0 SYMATTR InstName U4 SYMBOL Opamps\\LT1807 -1088 -272 R0 WINDOW 3 -43 146 Left 0 SYMATTR InstName U1 SYMBOL res -1312 80 R0 SYMATTR InstName R6 SYMATTR Value 3.3k SYMBOL res -1312 208 R0 SYMATTR InstName R7 SYMATTR Value 3.3k SYMBOL Opamps\\LT1006 -1152 288 M180 SYMATTR InstName U6 SYMBOL Digital\\74HC\\74hc74 64 -304 R0 SYMATTR InstName U8 SYMATTR SpiceLine VCC=3.3 SPEED=1.0 TRIPDT=1e-9 SYMBOL res 192 -208 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R4 SYMATTR Value 2.2k SYMBOL res 352 -208 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R8 SYMATTR Value 3.3k SYMBOL cap 304 -224 R0 SYMATTR InstName C2 SYMATTR Value 680p SYMBOL cap 480 -224 R0 SYMATTR InstName C8 SYMATTR Value 680p SYMBOL res -144 -208 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R13 SYMATTR Value 49 SYMBOL cap -1408 -288 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 0 32 VBottom 0 SYMATTR InstName C5 SYMATTR Value 10n SYMBOL res -1008 -192 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R3 SYMATTR Value 4.3k SYMBOL res -1008 -64 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R5 SYMATTR Value 4.3k SYMBOL cap -800 -288 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 91 35 VBottom 0 SYMATTR InstName C3 SYMATTR Value 1n SYMBOL Opamps\\LT1807 -768 -272 R0 WINDOW 3 -32 152 Left 0 SYMATTR InstName U2 SYMBOL res -384 -208 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R9 SYMATTR Value 49 SYMBOL res -688 -176 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R10 SYMATTR Value 4.3k SYMBOL res -688 -64 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 0 56 VBottom 0 SYMATTR InstName R11 SYMATTR Value 4.3k SYMBOL cap -496 -288 R270 WINDOW 0 32 32 VTop 0 WINDOW 3 91 35 VBottom 0 SYMATTR InstName C4 SYMATTR Value 1n SYMBOL Opamps\\LT1807 -448 -272 R0 WINDOW 3 -38 146 Left 0 SYMATTR InstName U3 TEXT -1248 384 Left 0 !.tran 2m TEXT -1544 0 Left 0 ;50MHz TEXT -1248 416 Left 0 !.include 74HC.lib TEXT 304 -64 Left 0 ;100KHz LPF TEXT -1256 456 Left 0 !.option plotwinsize=0