* SPICE netlist
Vin Vi 0 SINE(4.5 {G} {fr} 0 0 0 {N})
R5 Vi N010 5.1k
C4 Vi N010 68n
C3 N001 Vi 0.1
R6 N004 N001 10k
C5 N004 N001 68n
RVa1 N004 N011 {RVaTop}
RVa2 N011 P001 {RVaBot}
R3 P001 N013 2k
V1 N011 0 4.5
R11 N005 N013 15k
C7 N005 N013 82n
R12 N006 N005 422k
C8 N006 N005 390p
XU1 N004 N005 P002 0 N006 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
V2 P002 0 9
C9 P003 N006 1
R13 N007 P003 1k
D1 0 N007 D
D2 N007 0 D
C10 N008 N007 1
R8 N010 N014 1.5k
C6 N010 P004 390n
R9 P004 N014 1k
RVb1 N010 N012 {RVbTop}
RVb2 N012 N014 {RVbBot}
V3 N014 0 4.5
R15 P005 N012 22k
C11 N008 P005 2.2n
R17 N003 N012 27k
R18 P006 N012 12k
C12 N003 P006 27n
R16 N003 N008 47k
R7 N002 N001 1.5k
R19 N003 N002 15k
C16 N002 0 1
XU2 N009 N003 P007 P008 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
V4 N009 0 4.5
V5 P008 0 -8.6
V6 P007 0 16.2
C13 Vout N003 820p
R20 Vout N003 392k
Rload Vout 0 1000k

* LTspice schematic (.asc)
Version 4
SHEET 1 2544 960
WIRE -440 -464 -808 -464
WIRE -312 -464 -360 -464
WIRE -264 -464 -312 -464
WIRE 264 -464 -184 -464
WIRE 904 -464 728 -464
WIRE 1064 -464 968 -464
WIRE 728 -320 728 -464
WIRE 824 -320 728 -320
WIRE 1064 -320 1064 -464
WIRE 1064 -320 904 -320
WIRE -632 -144 -664 -144
WIRE -456 -96 -488 -96
WIRE -296 -80 -392 -80
WIRE -40 -80 -152 -80
WIRE 24 -80 -40 -80
WIRE 88 -80 24 -80
WIRE 168 -80 152 -80
WIRE 264 -80 264 -464
WIRE 264 -80 248 -80
WIRE 728 -80 728 -320
WIRE 728 -80 264 -80
WIRE 872 -80 728 -80
WIRE -1112 -64 -1272 -64
WIRE -920 -64 -1112 -64
WIRE -808 -64 -808 -464
WIRE -808 -64 -856 -64
WIRE -728 -64 -728 -144
WIRE -728 -64 -808 -64
WIRE -632 -64 -632 -144
WIRE -632 -64 -648 -64
WIRE -456 -64 -632 -64
WIRE 1064 -64 1064 -320
WIRE 1064 -64 936 -64
WIRE 1272 -64 1064 -64
WIRE 872 -48 824 -48
WIRE -40 -32 -40 -80
WIRE 24 -32 24 -80
WIRE -1272 -16 -1272 -64
WIRE -1112 -16 -1112 -64
WIRE -1032 -16 -1112 -16
WIRE -632 16 -632 -64
WIRE -8 32 -40 32
WIRE 24 32 -8 32
WIRE -8 48 -8 32
WIRE -1032 64 -1032 48
WIRE -1032 64 -1112 64
WIRE -632 96 -776 96
WIRE -1112 160 -1112 64
WIRE -1016 160 -1112 160
WIRE -936 160 -1016 160
WIRE -1112 176 -1112 160
WIRE -808 240 -936 240
WIRE 168 256 168 -80
WIRE 264 288 264 -80
WIRE 344 288 264 288
WIRE -632 304 -632 256
WIRE -488 304 -488 -96
WIRE -488 304 -552 304
WIRE -408 304 -488 304
WIRE -296 304 -296 -80
WIRE -296 304 -328 304
WIRE -1112 320 -1112 256
WIRE -1016 320 -1016 304
WIRE -1016 320 -1112 320
WIRE -936 320 -1016 320
WIRE -632 384 -632 304
WIRE -552 384 -552 304
WIRE -552 384 -568 384
WIRE -408 384 -408 304
WIRE -328 384 -328 304
WIRE -328 384 -344 384
WIRE 168 432 168 400
WIRE 200 432 168 432
WIRE 264 432 264 368
WIRE 264 432 200 432
WIRE 344 432 264 432
WIRE -808 480 -808 240
WIRE 200 480 200 432
WIRE 200 480 -808 480
FLAG -1272 64 0
FLAG -1272 -64 Vi
FLAG -776 176 0
FLAG -424 -48 0
FLAG -424 -192 0
FLAG -8 48 0
FLAG -1016 400 0
FLAG -312 -400 0
FLAG 824 32 0
FLAG 904 48 0
FLAG 904 -176 0
FLAG 1272 16 0
FLAG 1272 -64 Vout
FLAG -1240 -160 Vout
SYMBOL voltage -1272 -32 R0
SYMATTR InstName Vin
SYMATTR Value SINE(4.5 {G} {fr} 0 0 0 {N})
SYMBOL res -1128 -32 R0
SYMATTR InstName R5
SYMATTR Value 5.1k
SYMBOL cap -1048 -16 R0
SYMATTR InstName C4
SYMATTR Value 68n
SYMBOL cap -856 -80 R90
SYMATTR InstName C3
SYMATTR Value 0.1�
SYMBOL res -632 -80 R90
SYMATTR InstName R6
SYMATTR Value 10k
SYMBOL cap -664 -160 R90
SYMATTR InstName C5
SYMATTR Value 68n
SYMBOL res -648 0 R0
SYMATTR InstName RVa1
SYMATTR Value {RVaTop}
SYMBOL res -648 80 R0
SYMATTR InstName RVa2
SYMATTR Value {RVaBot}
SYMBOL res -648 160 R0
SYMATTR InstName R3
SYMATTR Value 2k
SYMBOL voltage -776 80 R0
SYMATTR InstName V1
SYMATTR Value 4.5
SYMBOL res -536 288 R90
SYMATTR InstName R11
SYMATTR Value 15k
SYMBOL cap -568 368 R90
SYMATTR InstName C7
SYMATTR Value 82n
SYMBOL res -312 288 R90
SYMATTR InstName R12
SYMATTR Value 422k
SYMBOL cap -344 368 R90
SYMATTR InstName C8
SYMATTR Value 390p
SYMBOL Opamps\\UniversalOpamp2 -424 -80 R0
SYMATTR InstName U1
SYMBOL voltage -424 -96 R180
SYMATTR InstName V2
SYMATTR Value 9
SYMBOL cap -232 -96 R90
SYMATTR InstName C9
SYMATTR Value 1�
SYMBOL res -136 -96 R90
SYMATTR InstName R13
SYMATTR Value 1k
SYMBOL diode -24 32 R180
SYMATTR InstName D1
SYMBOL diode 8 -32 R0
SYMATTR InstName D2
SYMBOL cap 152 -96 R90
SYMATTR InstName C10
SYMATTR Value 1�
SYMBOL res -1128 160 R0
SYMATTR InstName R8
SYMATTR Value 1.5k
SYMBOL cap -1032 160 R0
SYMATTR InstName C6
SYMATTR Value 390n
SYMBOL res -1032 208 R0
SYMATTR InstName R9
SYMATTR Value 1k
SYMBOL res -952 144 R0
SYMATTR InstName RVb1
SYMATTR Value {RVbTop}
SYMBOL res -952 224 R0
SYMATTR InstName RVb2
SYMATTR Value {RVbBot}
SYMBOL voltage -1016 304 R0
SYMATTR InstName V3
SYMATTR Value 4.5
SYMBOL res 152 304 R0
SYMATTR InstName R15
SYMATTR Value 22k
SYMBOL cap 152 256 R0
SYMATTR InstName C11
SYMATTR Value 2.2n
SYMBOL res 248 272 R0
SYMATTR InstName R17
SYMATTR Value 27k
SYMBOL res 328 336 R0
SYMATTR InstName R18
SYMATTR Value 12k
SYMBOL cap 328 288 R0
SYMATTR InstName C12
SYMATTR Value 27n
SYMBOL res 264 -96 R90
SYMATTR InstName R16
SYMATTR Value 47k
SYMBOL res -344 -480 R90
SYMATTR InstName R7
SYMATTR Value 1.5k
SYMBOL res -168 -480 R90
SYMATTR InstName R19
SYMATTR Value 15k
SYMBOL cap -328 -464 R0
SYMATTR InstName C16
SYMATTR Value 1�
SYMBOL Opamps\\UniversalOpamp2 904 -64 R0
SYMATTR InstName U2
SYMBOL voltage 824 -64 R0
SYMATTR InstName V4
SYMATTR Value 4.5
SYMBOL voltage 904 -48 R0
SYMATTR InstName V5
SYMATTR Value -8.6
SYMBOL voltage 904 -80 R180
SYMATTR InstName V6
SYMATTR Value 16.2
SYMBOL cap 968 -480 R90
SYMATTR InstName C13
SYMATTR Value 820p
SYMBOL res 920 -336 R90
SYMATTR InstName R20
SYMATTR Value 392k
SYMBOL res 1256 -80 R0
SYMATTR InstName Rload
SYMATTR Value 1000k