* SPICE netlist
Rb N003 v2 14.499
R1 N003 N011 1.02
R3 N006 v3 1.02
R4 v3 N012 1.275
R5 N012 0 1
C1 0 N003 1
C2 N011 N006 1
XU1 N006 N003 v3 opamp Aol=100K GBW=10Meg ;pnba invin)noninvin)out
XU2 N006 N012 N011 opamp Aol=100K GBW=10Meg ;pnba invin)noninvin)out
V1 vi 0 AC 1 1
Rb1 N002 v1 7.981
R2 N002 N009 1.129
R6 N005 v2 1.129
R7 v2 N010 1.275
R8 N010 0 1
C3 0 N002 1
C4 N009 N005 1
XU3 N005 N002 v2 opamp Aol=100K GBW=10Meg ;pnba invin)noninvin)out
XU4 N005 N010 N009 opamp Aol=100K GBW=10Meg ;pnba invin)noninvin)out
Rb2 N001 vi 17.77
R9 N001 N007 1.25
R10 N004 v1 1.25
R11 v1 N008 1.275
R12 N008 0 1
C5 0 N001 1
C6 N007 N004 1
XU5 N004 N001 v1 opamp Aol=100K GBW=10Meg ;pnba invin)noninvin)out
XU6 N004 N008 N007 opamp Aol=100K GBW=10Meg ;pnba invin)noninvin)out
.ac dec 1000 0.01 100
.inc opamp.sub

* LTspice schematic (.asc)
Version 4
SHEET 1 2976 416
WIRE -864 -208 -1232 -208
WIRE 128 -208 -240 -208
WIRE 1136 -208 768 -208
WIRE -736 -192 -800 -192
WIRE -448 -192 -736 -192
WIRE 256 -192 192 -192
WIRE 544 -192 256 -192
WIRE 1264 -192 1200 -192
WIRE -864 -176 -928 -176
WIRE 128 -176 64 -176
WIRE 1136 -176 1072 -176
WIRE -1376 -16 -1488 -16
WIRE -1232 -16 -1232 -208
WIRE -1232 -16 -1296 -16
WIRE -1184 -16 -1232 -16
WIRE -1088 -16 -1104 -16
WIRE -1024 -16 -1088 -16
WIRE -928 -16 -928 -176
WIRE -928 -16 -960 -16
WIRE -880 -16 -928 -16
WIRE -736 -16 -736 -192
WIRE -736 -16 -800 -16
WIRE -688 -16 -736 -16
WIRE -576 -16 -608 -16
WIRE -512 -16 -576 -16
WIRE -448 -16 -448 -192
WIRE -384 -16 -448 -16
WIRE -240 -16 -240 -208
WIRE -240 -16 -304 -16
WIRE -192 -16 -240 -16
WIRE -96 -16 -112 -16
WIRE -32 -16 -96 -16
WIRE 64 -16 64 -176
WIRE 64 -16 32 -16
WIRE 112 -16 64 -16
WIRE 256 -16 256 -192
WIRE 256 -16 192 -16
WIRE 304 -16 256 -16
WIRE 416 -16 384 -16
WIRE 480 -16 416 -16
WIRE 544 -16 544 -192
WIRE 624 -16 544 -16
WIRE 768 -16 768 -208
WIRE 768 -16 704 -16
WIRE 816 -16 768 -16
WIRE 912 -16 896 -16
WIRE 976 -16 912 -16
WIRE 1072 -16 1072 -176
WIRE 1072 -16 1040 -16
WIRE 1120 -16 1072 -16
WIRE 1264 -16 1264 -192
WIRE 1264 -16 1200 -16
WIRE 1312 -16 1264 -16
WIRE 1424 -16 1392 -16
WIRE 1488 -16 1424 -16
WIRE -1488 32 -1488 -16
WIRE -512 32 -512 -16
WIRE 480 32 480 -16
WIRE 1488 32 1488 -16
WIRE -1232 48 -1232 -16
WIRE -240 48 -240 -16
WIRE 768 48 768 -16
WIRE -1488 96 -1488 32
WIRE -928 112 -928 -16
WIRE -928 112 -960 112
WIRE 64 112 64 -16
WIRE 64 112 32 112
WIRE 1072 112 1072 -16
WIRE 1072 112 1040 112
WIRE -1088 128 -1088 -16
WIRE -1024 128 -1088 128
WIRE -96 128 -96 -16
WIRE -32 128 -96 128
WIRE 912 128 912 -16
WIRE 976 128 912 128
WIRE -576 144 -576 -16
WIRE -576 144 -960 144
WIRE 416 144 416 -16
WIRE 416 144 32 144
WIRE 1424 144 1424 -16
WIRE 1424 144 1040 144
WIRE -512 192 -512 112
WIRE 480 192 480 112
WIRE 1488 192 1488 112
WIRE -1232 208 -1232 112
WIRE -240 208 -240 112
WIRE 768 208 768 112
FLAG 1488 192 0
FLAG 768 208 0
FLAG -1488 176 0
FLAG -1488 32 vi
FLAG 480 192 0
FLAG -240 208 0
FLAG -512 192 0
FLAG -1232 208 0
FLAG -448 -192 v1
IOPIN -32 80 Out
FLAG 544 -192 v2
IOPIN 960 80 Out
FLAG 1264 -192 v3
IOPIN 1680 80 Out
SYMBOL res 720 -32 R90
SYMATTR InstName Rb
SYMATTR Value 14.499
SYMBOL res 800 0 R270
SYMATTR InstName R1
SYMATTR Value 1.02
SYMBOL res 1104 0 R270
SYMATTR InstName R3
SYMATTR Value 1.02
SYMBOL res 1296 0 R270
SYMATTR InstName R4
SYMATTR Value 1.275
SYMBOL res 1472 16 R0
SYMATTR InstName R5
SYMATTR Value 1
SYMBOL cap 784 112 R180
SYMATTR InstName C1
SYMATTR Value 1
SYMBOL cap 976 0 R270
SYMATTR InstName C2
SYMATTR Value 1
SYMBOL OpAmps\\opamp 1168 -128 M180
SYMATTR InstName U1
SYMBOL OpAmps\\opamp 1008 64 M0
SYMATTR InstName U2
SYMBOL voltage -1488 80 R0
SYMATTR Value2 AC 1 1
SYMATTR InstName V1
SYMATTR Value ""
SYMBOL res -288 -32 R90
SYMATTR InstName Rb1
SYMATTR Value 7.981
SYMBOL res -208 0 R270
SYMATTR InstName R2
SYMATTR Value 1.129
SYMBOL res 96 0 R270
SYMATTR InstName R6
SYMATTR Value 1.129
SYMBOL res 288 0 R270
SYMATTR InstName R7
SYMATTR Value 1.275
SYMBOL res 464 16 R0
SYMATTR InstName R8
SYMATTR Value 1
SYMBOL cap -224 112 R180
SYMATTR InstName C3
SYMATTR Value 1
SYMBOL cap -32 0 R270
SYMATTR InstName C4
SYMATTR Value 1
SYMBOL OpAmps\\opamp 160 -128 M180
SYMATTR InstName U3
SYMBOL OpAmps\\opamp 0 64 M0
SYMATTR InstName U4
SYMBOL res -1280 -32 R90
SYMATTR InstName Rb2
SYMATTR Value 17.77
SYMBOL res -1200 0 R270
SYMATTR InstName R9
SYMATTR Value 1.25
SYMBOL res -896 0 R270
SYMATTR InstName R10
SYMATTR Value 1.25
SYMBOL res -704 0 R270
SYMATTR InstName R11
SYMATTR Value 1.275
SYMBOL res -528 16 R0
SYMATTR InstName R12
SYMATTR Value 1
SYMBOL cap -1216 112 R180
SYMATTR InstName C5
SYMATTR Value 1
SYMBOL cap -1024 0 R270
SYMATTR InstName C6
SYMATTR Value 1
SYMBOL OpAmps\\opamp -832 -128 M180
SYMATTR InstName U5
SYMBOL OpAmps\\opamp -992 64 M0
SYMATTR InstName U6