* SPICE netlist
V1 Vin N011 PULSE(0 -10m 1u 1n 1n 100m 2000m) AC 1
V2 VSP 0 5
V3 0 VSN 5
R1 N001 N009 470
R2 N002 N001 12k
R3 N010 N009 12k
XU1 Vin N001 VSP VSN N002 level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
XU2 N011 N009 VSP VSN N010 level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
R4 N005 N002 10k
R5 N003 N005 10k
R6 N007 N010 10k
R7 0 N007 10k
XU3 N007 N005 VSP VSN N003 level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
R8 N008 N003 24k
R9 N006 N008 24k
C1 N008 Vout 100n
C2 N006 0 100n
XU4 N006 N004 VSP VSN Vout level2 Avol=1Meg GBW=10Meg Slew=10Meg Ilimit=25m Rail=0 Vos=0 En=0 Enk=0 In=0 Ink=0 Rin=500Meg ;pnba In+)In-)V+)V-)OUT
R10 N004 0 20k
R11 Vout N004 10k
R12 N011 0 10k
.tran 20m

* LTspice schematic (.asc)
Version 4
SHEET 1 1936 752
WIRE -136 -360 -152 -360
WIRE -24 -344 -72 -344
WIRE -136 -328 -488 -328
WIRE -24 -296 -24 -344
WIRE 184 -296 -24 -296
WIRE 376 -296 344 -296
WIRE 696 -296 680 -296
WIRE 936 -296 856 -296
WIRE 680 -264 680 -296
WIRE -776 -248 -872 -248
WIRE -872 -200 -872 -248
WIRE -152 -136 -152 -360
WIRE -24 -136 -24 -296
WIRE -24 -136 -72 -136
WIRE -488 -72 -488 -328
WIRE -152 -72 -152 -136
WIRE 776 -72 776 -296
WIRE 792 -72 776 -72
WIRE 264 -56 264 -296
WIRE 280 -56 264 -56
WIRE 936 -56 936 -296
WIRE 936 -56 856 -56
WIRE 968 -56 936 -56
WIRE -872 -40 -872 -120
WIRE -872 -40 -968 -40
WIRE 376 -40 376 -296
WIRE 376 -40 344 -40
WIRE 488 -40 376 -40
WIRE 792 -40 648 -40
WIRE 280 -24 264 -24
WIRE -968 -8 -968 -40
WIRE -872 24 -872 -40
WIRE 568 56 568 -40
WIRE 648 56 648 -40
WIRE -152 72 -152 8
WIRE -24 72 -72 72
WIRE -872 152 -872 104
WIRE -776 152 -872 152
WIRE -24 152 -24 72
WIRE 184 152 -24 152
WIRE 264 152 264 -24
WIRE 376 152 344 152
WIRE 648 152 648 120
WIRE 376 200 376 152
WIRE -152 216 -152 72
WIRE -136 216 -152 216
WIRE 568 216 568 120
WIRE 936 216 936 -56
WIRE 936 216 568 216
WIRE -24 232 -24 152
WIRE -24 232 -72 232
WIRE -488 248 -488 8
WIRE -136 248 -488 248
WIRE -488 264 -488 248
WIRE -488 376 -488 344
FLAG -968 -8 0
FLAG -776 -248 VSP
FLAG -776 152 VSN
FLAG 376 200 0
FLAG 648 152 0
FLAG 680 -264 0
FLAG -488 376 0
FLAG -104 -376 VSP
FLAG -104 200 VSP
FLAG 312 -72 VSP
FLAG 824 -88 VSP
FLAG -104 -312 VSN
FLAG -104 264 VSN
FLAG 312 -8 VSN
FLAG 824 -24 VSN
FLAG 968 -56 Vout
FLAG -488 -328 Vin
SYMBOL voltage -488 -88 R0
SYMATTR Value2 AC 1
SYMATTR InstName V1
SYMATTR Value PULSE(0 -10m 1u 1n 1n 100m 2000m)
SYMBOL voltage -872 -216 R0
SYMATTR InstName V2
SYMATTR Value 5
SYMBOL voltage -872 8 R0
SYMATTR InstName V3
SYMATTR Value 5
SYMBOL res -136 -88 M0
SYMATTR InstName R1
SYMATTR Value 470
SYMBOL res -56 -152 R90
SYMATTR InstName R2
SYMATTR Value 12k
SYMBOL res -56 56 R90
SYMATTR InstName R3
SYMATTR Value 12k
SYMBOL OpAmps\\UniversalOpAmp2 -104 -344 R0
SYMATTR InstName U1
SYMBOL OpAmps\\UniversalOpAmp2 -104 232 R0
SYMATTR InstName U2
SYMBOL res 280 -312 R90
SYMATTR InstName R4
SYMATTR Value 10k
SYMBOL res 360 -312 R90
SYMATTR InstName R5
SYMATTR Value 10k
SYMBOL res 280 136 R90
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL res 360 136 R90
SYMATTR InstName R7
SYMATTR Value 10k
SYMBOL OpAmps\\UniversalOpAmp2 312 -40 R0
SYMATTR InstName U3
SYMBOL res 584 -56 R90
SYMATTR InstName R8
SYMATTR Value 24k
SYMBOL res 664 -56 R90
SYMATTR InstName R9
SYMATTR Value 24k
SYMBOL cap 552 56 R0
SYMATTR InstName C1
SYMATTR Value 100n
SYMBOL cap 632 56 R0
SYMATTR InstName C2
SYMATTR Value 100n
SYMBOL OpAmps\\UniversalOpAmp2 824 -56 R0
SYMATTR InstName U4
SYMBOL res 792 -312 R90
SYMATTR InstName R10
SYMATTR Value 20k
SYMBOL res 872 -312 R90
SYMATTR InstName R11
SYMATTR Value 10k
SYMBOL res -504 248 R0
SYMATTR InstName R12
SYMATTR Value 10k