Version 4
SHEET 1 2208 724
WIRE 208 -96 144 -96
WIRE 288 -96 272 -96
WIRE 1632 -48 1376 -48
WIRE 1840 -48 1632 -48
WIRE 928 -32 896 -32
WIRE 1040 -32 1008 -32
WIRE 1376 -32 1376 -48
WIRE 1840 -32 1840 -48
WIRE 144 -16 144 -96
WIRE 144 -16 112 -16
WIRE 208 -16 144 -16
WIRE 288 -16 288 -96
WIRE 1632 -16 1632 -48
WIRE 288 48 288 -16
WIRE 1376 64 1376 48
WIRE 1536 64 1376 64
WIRE 1840 64 1840 48
WIRE 1936 64 1840 64
WIRE 1984 64 1936 64
WIRE 144 80 144 -16
WIRE 176 80 144 80
WIRE 1376 80 1376 64
WIRE 1840 80 1840 64
WIRE 288 96 288 48
WIRE 288 96 240 96
WIRE 352 96 288 96
WIRE 1536 96 1536 64
WIRE 1936 96 1936 64
WIRE 0 112 -48 112
WIRE 144 112 80 112
WIRE 160 112 144 112
WIRE 176 112 160 112
WIRE 816 112 752 112
WIRE 896 112 896 -32
WIRE 928 112 896 112
WIRE -48 128 -48 112
WIRE 160 128 160 112
WIRE 176 128 160 128
WIRE 1040 128 1040 -32
WIRE 1040 128 992 128
WIRE 1088 128 1040 128
WIRE 1104 128 1088 128
WIRE 144 144 144 112
WIRE 752 144 752 112
WIRE 928 144 896 144
WIRE 176 176 176 128
WIRE 1376 176 1376 160
WIRE 1472 176 1376 176
WIRE 816 192 816 112
WIRE 896 192 896 144
WIRE 1376 192 1376 176
WIRE 1472 192 1472 176
WIRE 208 368 144 368
WIRE 288 368 272 368
WIRE 144 448 144 368
WIRE 144 448 112 448
WIRE 208 448 144 448
WIRE 288 448 288 368
WIRE 288 512 288 448
WIRE 144 544 144 448
WIRE 176 544 144 544
WIRE 288 560 288 512
WIRE 288 560 240 560
WIRE 352 560 288 560
WIRE 0 576 -48 576
WIRE 144 576 80 576
WIRE 160 576 144 576
WIRE 176 576 160 576
WIRE -48 592 -48 576
WIRE 160 592 160 576
WIRE 176 592 160 592
WIRE 144 608 144 576
WIRE 176 640 176 592
FLAG 496 32 VCC
FLAG 208 64 VCC
FLAG 496 112 0
FLAG 208 128 0
FLAG -48 208 0
FLAG 144 224 0
FLAG 32 -16 0
FLAG 288 48 OUT
FLAG -48 112 IN
FLAG 960 96 VCC
FLAG 960 160 0
FLAG 752 224 0
FLAG 1088 128 OUT2
FLAG 1104 208 0
FLAG 352 160 0
FLAG 176 240 0
FLAG 208 528 VCC
FLAG 208 592 0
FLAG -48 672 0
FLAG 144 688 0
FLAG 32 448 0
FLAG 288 512 OUT3
FLAG 352 624 0
FLAG 176 704 0
FLAG 1376 272 0
FLAG 1472 256 0
FLAG 1536 160 0
FLAG 1632 64 0
FLAG 1376 176 ANALOG_IN
FLAG 1984 64 MEASURE_VCC
FLAG 1936 160 0
FLAG 1840 160 0
SYMBOL MCP6001 208 32 R0
SYMATTR InstName U1
SYMBOL voltage 496 16 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 124 Left 2
SYMATTR InstName V1
SYMATTR Value 3.3
SYMATTR SpiceLine Rser=0.1
SYMBOL voltage -48 112 M0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V2
SYMATTR Value SINE(15m 20m 100k)
SYMATTR Value2 AC 15m
SYMBOL res 16 0 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL res -16 128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL res 160 240 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R3
SYMATTR Value 56k
SYMBOL res 192 0 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R4
SYMATTR Value 56k
SYMBOL MCP6001 960 64 R0
SYMATTR InstName U2
SYMBOL voltage 752 128 R0
WINDOW 123 24 152 Left 2
WINDOW 39 24 124 Left 2
SYMATTR InstName V3
SYMATTR Value 1
SYMATTR Value2 AC 0
SYMATTR SpiceLine Rser=0.1
SYMBOL res 1088 112 R0
SYMATTR InstName R5
SYMATTR Value 1k
SYMBOL res 800 128 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R6
SYMATTR Value 1
SYMBOL res 800 208 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R7
SYMATTR Value 1
SYMBOL res 1024 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R8
SYMATTR Value 1m
SYMBOL cap 336 96 R0
SYMATTR InstName C1
SYMATTR Value 10p
SYMBOL cap 160 176 R0
SYMATTR InstName C2
SYMATTR Value 220p
SYMBOL cap 272 -112 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 10p
SYMBOL MCP6001 208 496 R0
SYMATTR InstName U3
SYMBOL voltage -48 576 M0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value SINE(15m 20m 100k)
SYMATTR Value2 AC 15m
SYMBOL res 16 464 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R9
SYMATTR Value 1k
SYMBOL res -16 592 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R10
SYMATTR Value 1k
SYMBOL res 160 704 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R11
SYMATTR Value 56k
SYMBOL res 192 464 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R12
SYMATTR Value 56k
SYMBOL cap 336 560 R0
SYMATTR InstName C4
SYMATTR Value 10p
SYMBOL cap 160 640 R0
SYMATTR InstName C5
SYMATTR Value 470p
SYMBOL cap 272 352 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C6
SYMATTR Value 22p
SYMBOL res 1360 -48 R0
SYMATTR InstName R13
SYMATTR Value 10k
SYMBOL res 1360 64 R0
SYMATTR InstName R14
SYMATTR Value 5.1k
SYMBOL res 1360 176 R0
SYMATTR InstName R15
SYMATTR Value 5.1k
SYMBOL cap 1456 192 R0
SYMATTR InstName C7
SYMATTR Value 1n
SYMBOL cap 1520 96 R0
SYMATTR InstName C8
SYMATTR Value 10p
SYMBOL voltage 1632 -32 R0
WINDOW 123 24 152 Left 2
WINDOW 39 24 124 Left 2
SYMATTR InstName V5
SYMATTR Value 1
SYMATTR Value2 AC 1
SYMATTR SpiceLine Rser=0.1
SYMBOL res 1824 -48 R0
SYMATTR InstName R16
SYMATTR Value 100k
SYMBOL res 1824 64 R0
SYMATTR InstName R17
SYMATTR Value 10k
SYMBOL cap 1920 96 R0
SYMATTR InstName C9
SYMATTR Value 1n
TEXT -696 48 Left 2 !;tran 100u
TEXT -704 -80 Left 2 !.option gmin=1e-10 abstol=1e-10 reltol=0.003
TEXT -704 -48 Left 2 !.options cshunt=1e-15
TEXT -712 -120 Left 2 ;suggested here: https://www.mikrocontroller.net/topic/205053#2022691
TEXT -696 88 Left 2 !.ac oct 10 1 1Meg
TEXT -704 -16 Left 2 !.options ptrantau=1u