* SPICE netlist
XU1 N004 N001 Vcc Vss N003 LM324 ;pnba In+)In-)V+)V-)OUT
R1 N001 0 10k
R2 N002 N001 90k
R3 N002 N005 850
R4 0 N005 44.7
V1 N004 0 V
XU2 N003 N005 Vcc Vss N002 LM324 ;pnba In+)In-)V+)V-)OUT
V2 Vcc 0 10
V3 Vss 0 -10
Ri1 N007 0 1k
Rf1 out N007 9k
R5 0 N013 21.8
R6 N013 out 850
V4 N014 0 SINE(0 10m 100) AC 1.
R7 N010 0 1k
C1 N010 N009 31p
R8 N010 N009 1k
XU5 N010 N013 Vss Vcc out LM6181/NS ;pnba In+)In-)V+)V-)OUT
XU6 N014 N007 Vcc Vss N009 LM324 ;pnba In+)In-)V+)V-)OUT
Ri2 N006 0 1k
Rf2 out N006 9k
R9 0 N011 1k
R10 N011 out 22.6k
V5 N012 0 SINE(0 10m 100) AC 1.
XU7 N008 N011 Vss Vcc out LM6181/NS ;pnba In+)In-)V+)V-)OUT
XU8 N012 N006 Vcc Vss N008 LM324 ;pnba In+)In-)V+)V-)OUT
.ac dec 1000 100 10k
.include LM6181.mod

* LTspice schematic (.asc)
Version 4.1
SHEET 1 2128 880
WIRE -408 -424 -616 -424
WIRE -168 -424 -328 -424
WIRE -776 -312 -808 -312
WIRE -616 -312 -616 -424
WIRE -616 -312 -696 -312
WIRE -552 -312 -616 -312
WIRE -264 -296 -488 -296
WIRE -552 -280 -616 -280
WIRE -168 -280 -168 -424
WIRE -168 -280 -200 -280
WIRE -1064 -264 -1064 -280
WIRE -984 -264 -984 -280
WIRE -264 -264 -296 -264
WIRE -616 -248 -616 -280
WIRE -808 -216 -808 -312
WIRE -1064 -168 -1064 -184
WIRE -984 -168 -984 -184
WIRE -616 -152 -616 -168
WIRE -296 -152 -296 -264
WIRE -264 -152 -296 -152
WIRE -168 -152 -168 -280
WIRE -168 -152 -184 -152
WIRE -296 -120 -296 -152
WIRE -296 -24 -296 -40
WIRE 696 40 424 40
WIRE 1048 40 776 40
WIRE -520 72 -792 72
WIRE -168 72 -440 72
WIRE 856 136 760 136
WIRE 296 152 248 152
WIRE 424 152 424 40
WIRE 424 152 376 152
WIRE 488 152 424 152
WIRE 1048 152 1048 40
WIRE 1048 152 920 152
WIRE 1064 152 1048 152
WIRE -552 168 -600 168
WIRE -456 168 -488 168
WIRE -360 168 -456 168
WIRE 760 168 760 136
WIRE 760 168 552 168
WIRE 856 168 840 168
WIRE -920 184 -968 184
WIRE -792 184 -792 72
WIRE -792 184 -840 184
WIRE -728 184 -792 184
WIRE -168 184 -168 72
WIRE -168 184 -296 184
WIRE -152 184 -168 184
WIRE 488 184 424 184
WIRE -600 200 -600 168
WIRE -600 200 -664 200
WIRE -360 200 -376 200
WIRE 248 200 248 152
WIRE -728 216 -792 216
WIRE 424 216 424 184
WIRE -968 232 -968 184
WIRE -792 248 -792 216
WIRE -600 248 -600 200
WIRE -568 248 -600 248
WIRE -456 248 -456 168
WIRE -456 248 -488 248
WIRE -456 280 -456 248
WIRE 840 280 840 168
WIRE 936 280 840 280
WIRE 1048 280 1048 152
WIRE 1048 280 1016 280
WIRE 840 296 840 280
WIRE -376 312 -376 200
WIRE -280 312 -376 312
WIRE -168 312 -168 184
WIRE -168 312 -200 312
WIRE -376 328 -376 312
WIRE 424 328 424 296
WIRE -792 360 -792 328
WIRE 840 408 840 376
WIRE -456 424 -456 360
WIRE -376 424 -376 408
WIRE -376 424 -456 424
WIRE -376 440 -376 424
FLAG -520 -264 Vss
FLAG -520 -328 Vcc
FLAG -808 -216 0
FLAG -616 -152 0
FLAG -232 -312 Vss
FLAG -232 -248 Vcc
FLAG -296 -24 0
FLAG -1064 -168 0
FLAG -984 -168 0
FLAG -1064 -280 Vcc
FLAG -984 -280 Vss
FLAG -376 440 0
FLAG -968 232 0
FLAG -792 360 0
FLAG -152 184 out
FLAG -696 168 Vcc
FLAG -696 232 Vss
FLAG -328 152 Vcc
FLAG -328 216 Vss
FLAG 840 408 0
FLAG 248 200 0
FLAG 424 328 0
FLAG 1064 152 out
FLAG 520 136 Vcc
FLAG 520 200 Vss
FLAG 888 120 Vcc
FLAG 888 184 Vss
SYMBOL OpAmps\\opamp2 -520 -360 R0
SYMATTR InstName U1
SYMATTR Value LM324
SYMBOL res -680 -328 R90
SYMATTR InstName R1
SYMATTR Value 10k
SYMBOL res -312 -440 R90
SYMATTR InstName R2
SYMATTR Value 90k
SYMBOL res -168 -168 R90
SYMATTR InstName R3
SYMATTR Value 850
SYMBOL res -280 -24 R180
SYMATTR InstName R4
SYMATTR Value 44.7
SYMBOL voltage -616 -264 R0
SYMATTR InstName V1
SYMBOL OpAmps\\opamp2 -232 -216 M180
SYMATTR InstName U2
SYMATTR Value LM324
SYMBOL voltage -1064 -280 R0
SYMATTR InstName V2
SYMATTR Value 10
SYMBOL voltage -984 -280 R0
SYMATTR InstName V3
SYMATTR Value -10
SYMBOL res -824 168 R90
SYMATTR InstName Ri1
SYMATTR Value 1k
SYMBOL res -424 56 R90
SYMATTR InstName Rf1
SYMATTR Value 9k
SYMBOL res -360 424 R180
SYMATTR InstName R5
SYMATTR Value 21.8
SYMBOL res -296 328 R270
SYMATTR InstName R6
SYMATTR Value 850
SYMBOL voltage -792 232 R0
SYMATTR Value2 AC 1.
SYMATTR InstName V4
SYMATTR Value SINE(0 10m 100)
SYMBOL res -472 264 R0
SYMATTR InstName R7
SYMATTR Value 1k
SYMBOL cap -488 152 R90
SYMATTR InstName C1
SYMATTR Value 31p
SYMBOL res -472 232 R90
SYMATTR InstName R8
SYMATTR Value 1k
SYMBOL OpAmps\\opamp2 -328 248 M180
SYMATTR InstName U5
SYMATTR Value LM6181/NS
SYMBOL OpAmps\\opamp2 -696 136 R0
SYMATTR InstName U6
SYMATTR Value LM324
SYMBOL res 392 136 R90
SYMATTR InstName Ri2
SYMATTR Value 1k
SYMBOL res 792 24 R90
SYMATTR InstName Rf2
SYMATTR Value 9k
SYMBOL res 856 392 R180
SYMATTR InstName R9
SYMATTR Value 1k
SYMBOL res 920 296 R270
SYMATTR InstName R10
SYMATTR Value 22.6k
SYMBOL voltage 424 200 R0
SYMATTR Value2 AC 1.
SYMATTR InstName V5
SYMATTR Value SINE(0 10m 100)
SYMBOL OpAmps\\opamp2 888 216 M180
SYMATTR InstName U7
SYMATTR Value LM6181/NS
SYMBOL OpAmps\\opamp2 520 104 R0
SYMATTR InstName U8
SYMATTR Value LM324