* SPICE netlist
V1 IN 0 AC 1.0
R1 IN2 IN 10K
R4 N003 V5 22k
R6 0 N004 5.1k
XU1 V5 IN2 V5 opamp Aol=100K GBW=3Meg ;pnba invin)noninvin)out
XU2 V6 N004 V6 opamp Aol=100K GBW=3Meg ;pnba invin)noninvin)out
R3 N002 N003 22k
C2 N004 N002 100n
C4 0 IN2 10n
C5 0 N003 10n
C6 0 N002 10n
R5 0 IN2 100K
C7 GA V6 100n
R7 0 GA 100k
XU3 N001 GA V4b opamp Aol=100K GBW=3Meg ;pnba invin)noninvin)out
R9 0 N001 51
R10 V4b N001 5.1k
C8 V4b N001 10n
R11 V4 V4b 1k
C9 0 V4 100n
R2 N002 AFC 12k
.ac oct 25 10 10K
.include opamp.sub

* LTspice schematic (.asc)
Version 4.1
SHEET 1 2256 416
WIRE 760 -192 728 -192
WIRE 872 -192 824 -192
WIRE -280 -128 -344 -128
WIRE -232 -128 -280 -128
WIRE -120 -128 -152 -128
WIRE -472 -80 -600 -80
WIRE 200 -80 72 -80
WIRE 728 -80 728 -192
WIRE 760 -80 728 -80
WIRE 872 -80 872 -192
WIRE 872 -80 840 -80
WIRE 952 -80 872 -80
WIRE 984 -80 952 -80
WIRE 728 0 728 -80
WIRE 776 0 728 0
WIRE 72 16 72 -80
WIRE 104 16 72 16
WIRE 872 16 872 -80
WIRE 872 16 840 16
WIRE 904 16 872 16
WIRE 1016 16 984 16
WIRE 1064 16 1016 16
WIRE 1128 16 1064 16
WIRE -600 32 -600 -80
WIRE -568 32 -600 32
WIRE 200 32 200 -80
WIRE 200 32 168 32
WIRE 248 32 200 32
WIRE 552 32 248 32
WIRE 632 32 616 32
WIRE 680 32 632 32
WIRE 776 32 680 32
WIRE -472 48 -472 -80
WIRE -472 48 -504 48
WIRE -424 48 -472 48
WIRE -376 48 -424 48
WIRE -264 48 -296 48
WIRE -232 48 -264 48
WIRE -120 48 -120 -128
WIRE -120 48 -152 48
WIRE -24 48 -120 48
WIRE 56 48 40 48
WIRE 104 48 56 48
WIRE -1064 64 -1128 64
WIRE -872 64 -1064 64
WIRE -744 64 -792 64
WIRE -680 64 -744 64
WIRE -632 64 -680 64
WIRE -568 64 -632 64
WIRE -1128 96 -1128 64
WIRE -744 96 -744 64
WIRE -632 96 -632 64
WIRE -264 96 -264 48
WIRE -120 96 -120 48
WIRE 56 96 56 48
WIRE 632 96 632 32
WIRE 728 96 728 0
WIRE 1016 96 1016 16
WIRE -1128 208 -1128 176
WIRE -744 208 -744 160
WIRE -632 208 -632 176
WIRE -264 208 -264 160
WIRE -120 208 -120 160
WIRE 56 208 56 176
WIRE 632 208 632 176
WIRE 728 208 728 176
WIRE 1016 208 1016 160
FLAG -1128 208 0
FLAG 248 32 V6
FLAG -424 48 V5
FLAG -744 208 0
FLAG -264 208 0
FLAG -120 208 0
FLAG 56 208 0
FLAG -632 208 0
FLAG -280 -128 AFC
FLAG -1064 64 IN
FLAG -680 64 IN2
FLAG 632 208 0
FLAG 680 32 GA
FLAG 728 208 0
FLAG 1064 16 V4
FLAG 1016 208 0
FLAG 952 -80 V4b
SYMBOL voltage -1128 80 R0
SYMATTR InstName V1
SYMATTR Value ""
SYMATTR Value2 AC 1.0
SYMBOL res -776 48 R90
SYMATTR InstName R1
SYMATTR Value 10K
SYMBOL res -280 32 R90
SYMATTR InstName R4
SYMATTR Value 22k
SYMBOL res 72 192 R180
SYMATTR InstName R6
SYMATTR Value 5.1k
SYMBOL OPAMPS\\OPAMP -536 -16 R0
SYMATTR InstName U1
SYMATTR SpiceLine2 GBW=3Meg
SYMBOL OPAMPS\\OPAMP 136 -32 R0
SYMATTR InstName U2
SYMATTR SpiceLine2 GBW=3Meg
SYMBOL res -136 32 R90
SYMATTR InstName R3
SYMATTR Value 22k
SYMBOL cap 40 32 R90
SYMATTR InstName C2
SYMATTR Value 100n
SYMBOL cap -760 160 M180
SYMATTR InstName C4
SYMATTR Value 10n
SYMBOL cap -280 160 M180
SYMATTR InstName C5
SYMATTR Value 10n
SYMBOL cap -136 160 M180
SYMATTR InstName C6
SYMATTR Value 10n
SYMBOL res -616 192 R180
SYMATTR InstName R5
SYMATTR Value 100K
SYMBOL cap 616 16 R90
SYMATTR InstName C7
SYMATTR Value 100n
SYMBOL res 648 192 R180
SYMATTR InstName R7
SYMATTR Value 100k
SYMBOL OPAMPS\\OPAMP 808 -48 R0
SYMATTR InstName U3
SYMATTR SpiceLine2 GBW=3Meg
SYMBOL res 744 192 R180
SYMATTR InstName R9
SYMATTR Value 51
SYMBOL res 856 -96 R90
SYMATTR InstName R10
SYMATTR Value 5.1k
SYMBOL cap 824 -208 R90
SYMATTR InstName C8
SYMATTR Value 10n
SYMBOL res 1000 0 R90
SYMATTR InstName R11
SYMATTR Value 1k
SYMBOL cap 1000 160 M180
SYMATTR InstName C9
SYMATTR Value 100n
SYMBOL res -136 -144 R90
SYMATTR InstName R2
SYMATTR Value 12k