* SPICE netlist
C1 N014 0 100n
R1 N014 N012 1k
C2 N015 0 100n
R2 N015 N014 1k
C3 N013 0 100n
R3 N013 N015 1k
V1 N016 0 2.5
V2 Vcc 0 5
R4 N011 N013 55.2k
R5 N012 N011 1.5Meg
XU1 N016 N011 Vcc 0 N012 LT1880 ;pnba In+)In-)V+)V-)OUT
C4 N009 0 100n
R6 N009 N002 1k
C5 N008 0 100n
R7 N008 N004 1k
XU3 N009 N004 Vcc 0 N004 LT1880 ;pnba In+)In-)V+)V-)OUT
C6 N005 0 100n
R8 N005 N003 1k
XU4 N008 N003 Vcc 0 N003 LT1880 ;pnba In+)In-)V+)V-)OUT
V3 N010 0 2.5
R9 N001 N005 180k
R10 N002 N001 1.5Meg
XU5 N010 N001 Vcc 0 N002 LT1880 ;pnba In+)In-)V+)V-)OUT
R11 N007 N006 1k
C7 N007 0 100n
V4 N006 0 AC 1
.tran 10ms startup
;ac dec 1k 1 1Meg

* LTspice schematic (.asc)
Version 4
SHEET 1 2208 1024
WIRE -848 -496 -880 -496
WIRE -704 -496 -768 -496
WIRE 80 -496 -80 -496
WIRE -304 -480 -464 -480
WIRE -80 -400 -80 -496
WIRE -32 -400 -80 -400
WIRE -464 -384 -464 -480
WIRE -416 -384 -464 -384
WIRE 80 -384 80 -496
WIRE 80 -384 32 -384
WIRE 128 -384 80 -384
WIRE 256 -384 208 -384
WIRE 368 -384 256 -384
WIRE 976 -384 864 -384
WIRE 1104 -384 1056 -384
WIRE -1024 -368 -1104 -368
WIRE -880 -368 -880 -496
WIRE -880 -368 -944 -368
WIRE -848 -368 -880 -368
WIRE -304 -368 -304 -480
WIRE -304 -368 -352 -368
WIRE -256 -368 -304 -368
WIRE -128 -368 -176 -368
WIRE -32 -368 -128 -368
WIRE 256 -368 256 -384
WIRE 864 -368 864 -384
WIRE 1104 -368 1104 -384
WIRE -704 -352 -704 -496
WIRE -704 -352 -784 -352
WIRE -656 -352 -704 -352
WIRE -528 -352 -576 -352
WIRE -416 -352 -528 -352
WIRE -128 -352 -128 -368
WIRE -848 -336 -944 -336
WIRE -528 -336 -528 -352
WIRE -944 -304 -944 -336
WIRE 0 -304 0 -352
WIRE -384 -288 -384 -336
WIRE -816 -272 -816 -320
WIRE 256 -272 256 -304
WIRE 1104 -272 1104 -304
WIRE -128 -256 -128 -288
WIRE 672 -256 672 -288
WIRE 864 -256 864 -288
WIRE -528 -240 -528 -272
WIRE -944 -192 -944 -224
WIRE -1104 -96 -1104 -368
WIRE 368 -96 368 -384
WIRE 368 -96 -1104 -96
WIRE -880 160 -912 160
WIRE -736 160 -800 160
WIRE -1056 288 -1088 288
WIRE -912 288 -912 160
WIRE -912 288 -976 288
WIRE -880 288 -912 288
WIRE -736 304 -736 160
WIRE -736 304 -816 304
WIRE -624 304 -736 304
WIRE -496 304 -544 304
WIRE -352 304 -496 304
WIRE -224 304 -272 304
WIRE -128 304 -224 304
WIRE 0 304 -48 304
WIRE 192 304 0 304
WIRE -880 320 -976 320
WIRE -496 320 -496 304
WIRE -224 320 -224 304
WIRE 0 320 0 304
WIRE -976 352 -976 320
WIRE -848 384 -848 336
WIRE -496 416 -496 384
WIRE -224 416 -224 384
WIRE 0 416 0 384
WIRE -976 464 -976 432
WIRE -1088 512 -1088 288
WIRE 192 512 192 304
WIRE 192 512 -1088 512
FLAG -496 416 0
FLAG -224 416 0
FLAG 0 416 0
FLAG -848 384 0
FLAG 672 -256 0
FLAG -976 464 0
FLAG -848 272 Vcc
FLAG 672 -368 Vcc
FLAG -528 -240 0
FLAG -128 -256 0
FLAG -384 -288 0
FLAG -384 -400 Vcc
FLAG 256 -272 0
FLAG 0 -304 0
FLAG 0 -416 Vcc
FLAG -816 -272 0
FLAG -944 -192 0
FLAG -816 -384 Vcc
FLAG 1104 -272 0
FLAG 864 -256 0
SYMBOL cap -512 320 R0
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL res -528 288 R90
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL cap -240 320 R0
SYMATTR InstName C2
SYMATTR Value 100n
SYMBOL res -256 288 R90
SYMATTR InstName R2
SYMATTR Value 1k
SYMBOL cap -16 320 R0
SYMATTR InstName C3
SYMATTR Value 100n
SYMBOL res -32 288 R90
SYMATTR InstName R3
SYMATTR Value 1k
SYMBOL voltage -976 336 R0
SYMATTR InstName V1
SYMATTR Value 2.5
SYMBOL voltage 672 -384 R0
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL res -960 272 R90
SYMATTR InstName R4
SYMATTR Value 55.2k
SYMBOL res -784 144 R90
SYMATTR InstName R5
SYMATTR Value 1.5Meg
SYMBOL Opamps\\LT1880 -848 304 R0
SYMATTR InstName U1
SYMBOL cap -544 -336 R0
SYMATTR InstName C4
SYMATTR Value 100n
SYMBOL res -560 -368 R90
SYMATTR InstName R6
SYMATTR Value 1k
SYMBOL cap -144 -352 R0
SYMATTR InstName C5
SYMATTR Value 100n
SYMBOL res -160 -384 R90
SYMATTR InstName R7
SYMATTR Value 1k
SYMBOL Opamps\\LT1880 -384 -368 R0
SYMATTR InstName U3
SYMBOL cap 240 -368 R0
SYMATTR InstName C6
SYMATTR Value 100n
SYMBOL res 224 -400 R90
SYMATTR InstName R8
SYMATTR Value 1k
SYMBOL Opamps\\LT1880 0 -384 R0
SYMATTR InstName U4
SYMBOL voltage -944 -320 R0
SYMATTR InstName V3
SYMATTR Value 2.5
SYMBOL res -928 -384 R90
SYMATTR InstName R9
SYMATTR Value 180k
SYMBOL res -752 -512 R90
SYMATTR InstName R10
SYMATTR Value 1.5Meg
SYMBOL Opamps\\LT1880 -816 -352 R0
SYMATTR InstName U5
SYMBOL res 1072 -400 R90
SYMATTR InstName R11
SYMATTR Value 1k
SYMBOL cap 1088 -368 R0
SYMATTR InstName C7
SYMATTR Value 100n
SYMBOL voltage 864 -384 R0
SYMATTR InstName V4
SYMATTR Value ""
SYMATTR Value2 AC 1