Version 4
SHEET 1 1132 680
WIRE -96 -208 -96 -272
WIRE 864 16 720 16
WIRE -672 32 -704 32
WIRE -560 32 -592 32
WIRE -304 32 -336 32
WIRE -192 32 -224 32
WIRE 720 96 720 16
WIRE 752 96 720 96
WIRE 864 112 864 16
WIRE 864 112 816 112
WIRE 944 112 864 112
WIRE 960 112 944 112
WIRE 624 128 624 112
WIRE 752 128 624 128
WIRE -1152 144 -1184 144
WIRE -1072 144 -1152 144
WIRE -832 144 -1008 144
WIRE -704 144 -704 32
WIRE -704 144 -752 144
WIRE -688 144 -704 144
WIRE 624 144 624 128
WIRE -560 160 -560 32
WIRE -560 160 -624 160
WIRE -416 160 -560 160
WIRE -336 160 -336 32
WIRE -304 160 -336 160
WIRE -688 176 -704 176
WIRE -192 176 -192 32
WIRE -192 176 -240 176
WIRE 0 176 -192 176
WIRE 48 176 0 176
WIRE 160 176 112 176
WIRE 320 176 240 176
WIRE -304 192 -320 192
WIRE 320 224 320 176
WIRE -320 240 -320 192
WIRE -320 240 -368 240
WIRE -1152 320 -1200 320
WIRE -1072 320 -1152 320
WIRE -832 320 -1008 320
WIRE -704 320 -704 176
WIRE -704 320 -752 320
WIRE -688 320 -704 320
WIRE -544 320 -608 320
WIRE -512 320 -544 320
WIRE 320 336 320 304
FLAG 304 -208 0
FLAG 304 -288 +VCC
FLAG 784 144 0
FLAG 784 80 +VCC
FLAG 624 224 0
FLAG 944 112 V_MID
FLAG -656 128 +VCC
FLAG -96 -352 IN+
FLAG -96 -128 IN-
FLAG -1184 144 IN+
FLAG -1200 320 IN-
FLAG -656 192 0
FLAG 624 32 +VCC
FLAG -272 144 +VCC
FLAG -272 208 0
FLAG 320 416 0
FLAG 320 176 OUT
FLAG 0 176 IN
FLAG -544 320 V_MID
FLAG -368 240 V_MID
SYMBOL voltage 304 -304 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL Opamps\\AD8606 784 48 R0
SYMATTR InstName U2
SYMBOL Opamps\\AD8606 -656 96 R0
SYMATTR InstName U3
SYMBOL res 608 16 R0
SYMATTR InstName R1
SYMATTR Value 47k
SYMBOL res 608 128 R0
SYMATTR InstName R2
SYMATTR Value 47k
SYMBOL res -736 128 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R3
SYMATTR Value 10k
SYMBOL res -736 304 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL cap -1008 128 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value 10µ
SYMBOL cap -1008 304 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 10µ
SYMBOL res -576 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R7
SYMATTR Value 5k
SYMBOL res -704 336 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName R9
SYMATTR Value 5k
SYMBOL voltage -96 -368 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value SINE(0 {INPUT} 1k 0 0 0)
SYMBOL voltage -96 -112 R180
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value SINE(0 {INPUT} 1k 0 0 180)
SYMBOL res -1168 224 R0
SYMATTR InstName R8
SYMATTR Value 100k
SYMBOL res -1168 128 R0
SYMATTR InstName R11
SYMATTR Value 100k
SYMBOL Opamps\\AD8606 -272 112 R0
SYMATTR InstName U4
SYMBOL res -320 144 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R10
SYMATTR Value 10k
SYMBOL res -208 16 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R12
SYMATTR Value 1k
SYMBOL cap 112 160 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C3
SYMATTR Value 47µ
SYMBOL res 256 160 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R13
SYMATTR Value 18k
SYMBOL res 336 320 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R14
SYMATTR Value 2k
SYMBOL res 336 432 R180
WINDOW 0 36 76 Left 2
WINDOW 3 36 40 Left 2
SYMATTR InstName R15
SYMATTR Value 18k
TEXT 648 -248 Left 2 !.tran 0 11m 1m startup
TEXT 648 -280 Left 2 !.param INPUT=6.91