Version 4 SHEET 1 1036 1636 WIRE -5952 16 -5952 -32 WIRE -5984 32 -6016 32 WIRE -5344 32 -5344 -16 WIRE -5872 48 -5920 48 WIRE -5760 48 -5792 48 WIRE -5648 48 -5760 48 WIRE -5376 48 -5408 48 WIRE -5984 64 -6000 64 WIRE -5264 64 -5312 64 WIRE -5152 64 -5184 64 WIRE -5040 64 -5152 64 WIRE -5760 80 -5760 48 WIRE -5376 80 -5392 80 WIRE -5952 96 -5952 80 WIRE -5152 96 -5152 64 WIRE -5344 112 -5344 96 WIRE -6000 160 -6000 64 WIRE -5760 160 -5760 144 WIRE -5760 160 -6000 160 WIRE -5712 160 -5760 160 WIRE -5600 160 -5600 64 WIRE -5600 160 -5632 160 WIRE -5392 176 -5392 80 WIRE -5152 176 -5152 160 WIRE -5152 176 -5392 176 WIRE -5104 176 -5152 176 WIRE -4992 176 -4992 80 WIRE -4992 176 -5024 176 WIRE -7136 224 -7232 224 WIRE -7024 224 -7056 224 WIRE -6960 224 -7024 224 WIRE -6848 224 -6880 224 WIRE -6784 224 -6848 224 WIRE -6672 224 -6704 224 WIRE -6576 224 -6672 224 WIRE -7232 240 -7232 224 WIRE -6496 240 -6512 240 WIRE -6464 240 -6496 240 WIRE -6576 256 -6608 256 WIRE -7024 304 -7024 288 WIRE -6848 304 -6848 288 WIRE -6672 304 -6672 288 WIRE -6608 352 -6608 256 WIRE -6496 352 -6496 240 WIRE -6496 352 -6608 352 WIRE -5952 400 -5952 352 WIRE -5984 416 -6016 416 WIRE -5344 416 -5344 368 WIRE -5872 432 -5920 432 WIRE -5760 432 -5792 432 WIRE -5648 432 -5760 432 WIRE -5376 432 -5408 432 WIRE -5984 448 -6000 448 WIRE -5264 448 -5312 448 WIRE -5152 448 -5184 448 WIRE -5040 448 -5152 448 WIRE -5760 464 -5760 432 WIRE -5376 464 -5392 464 WIRE -5952 480 -5952 464 WIRE -5152 480 -5152 448 WIRE -5344 496 -5344 480 WIRE -6000 544 -6000 448 WIRE -5760 544 -5760 528 WIRE -5760 544 -6000 544 WIRE -5712 544 -5760 544 WIRE -5600 544 -5600 448 WIRE -5600 544 -5632 544 WIRE -5392 560 -5392 464 WIRE -5152 560 -5152 544 WIRE -5152 560 -5392 560 WIRE -5104 560 -5152 560 WIRE -4992 560 -4992 464 WIRE -4992 560 -5024 560 FLAG -5952 -32 0 FLAG -6208 304 0 FLAG -6208 464 0 FLAG -6208 384 OP+ FLAG -5952 96 OP+ FLAG -5600 -32 VIN FLAG -5600 240 0 FLAG -6016 32 VREF FLAG -5952 352 0 FLAG -5952 480 OP+ FLAG -5600 352 VIN FLAG -5600 624 0 FLAG -6016 416 VREF FLAG -5344 368 0 FLAG -5344 496 OP+ FLAG -4992 368 VIN FLAG -4992 640 0 FLAG -5408 432 VREF FLAG -5344 -16 0 FLAG -5344 112 OP+ FLAG -4992 -16 VIN FLAG -4992 256 0 FLAG -5408 48 VREF FLAG -6208 224 VIN FLAG -6464 240 VREF FLAG -6672 304 0 FLAG -6848 304 0 FLAG -7024 304 0 FLAG -6544 272 OP+ FLAG -6544 208 0 FLAG -7232 320 0 SYMBOL nmos -5648 -32 R0 SYMATTR InstName M1 SYMATTR Value IRF7807 SYMBOL voltage -6208 208 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V2 SYMATTR Value 30 SYMBOL res -5616 144 R0 SYMATTR InstName R4 SYMATTR Value 3.3 SYMBOL Opamps\\LT1001 -5952 112 M180 SYMATTR InstName U1 SYMBOL voltage -6208 368 R0 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR InstName V3 SYMATTR Value 9V SYMBOL res -5776 32 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R5 SYMATTR Value 1k SYMBOL res -5616 144 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R6 SYMATTR Value 1k SYMBOL cap -5776 80 R0 SYMATTR InstName C1 SYMATTR Value 1µ SYMBOL nmos -5648 352 R0 SYMATTR InstName M2 SYMATTR Value IRF7807 SYMBOL res -5616 528 R0 SYMATTR InstName R1 SYMATTR Value 3.3 SYMBOL Opamps\\LT1001 -5952 496 M180 SYMATTR InstName U2 SYMBOL res -5776 416 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R2 SYMATTR Value 1k SYMBOL res -5616 528 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R3 SYMATTR Value 1k SYMBOL cap -5776 464 R0 SYMATTR InstName C2 SYMATTR Value 1µ SYMBOL nmos -5040 368 R0 SYMATTR InstName M3 SYMATTR Value IRF7807 SYMBOL res -5008 544 R0 SYMATTR InstName R7 SYMATTR Value 3.3 SYMBOL Opamps\\LT1001 -5344 512 M180 SYMATTR InstName U3 SYMBOL res -5168 432 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R8 SYMATTR Value 1k SYMBOL res -5008 544 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R9 SYMATTR Value 1k SYMBOL cap -5168 480 R0 SYMATTR InstName C3 SYMATTR Value 1µ SYMBOL nmos -5040 -16 R0 SYMATTR InstName M4 SYMATTR Value IRF7807 SYMBOL res -5008 160 R0 SYMATTR InstName R10 SYMATTR Value 3.3 SYMBOL Opamps\\LT1001 -5344 128 M180 SYMATTR InstName U4 SYMBOL res -5168 48 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R11 SYMATTR Value 1k SYMBOL res -5008 160 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R12 SYMATTR Value 1k SYMBOL cap -5168 96 R0 SYMATTR InstName C4 SYMATTR Value 1µ SYMBOL cap -6864 224 R0 SYMATTR InstName C5 SYMATTR Value 6.8n SYMBOL res -6688 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R13 SYMATTR Value 47k SYMBOL cap -7040 224 R0 SYMATTR InstName C6 SYMATTR Value 6.8n SYMBOL res -6864 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R14 SYMATTR Value 47k SYMBOL res -7040 208 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 SYMATTR InstName R15 SYMATTR Value 47k SYMBOL cap -6688 224 R0 SYMATTR InstName C7 SYMATTR Value 6.8n SYMBOL voltage -7232 224 R0 WINDOW 3 -105 147 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value PULSE(0 3.3 0 1n 1n {ontime} 20u) SYMATTR InstName V1 SYMBOL OWN\\LM324 -6544 304 M180 SYMATTR InstName U5 TEXT -6560 56 Left 2 !.tran 0 10m 0 10u startup TEXT -7336 416 Left 2 !.step param ontime 1u 20u 1u