* SPICE netlist
R1 N009 N008 {R2} tol={E}
R2 N010 N009 {R3} tol={E}
C1 N009 N005 {C1}
C2 N010 0 {C2}
V1 N001 0 AC 1
R5 N002 N001 {R6} tol={A}
R6 N003 N002 {R6} tol={A}
C3 N002 N012 {Cnotch}
C4 N007 N001 {C1}
C5 N003 N007 {C1}
R7 N007 N012 {Rnotch} tol={A}
R11 N011 0 {R5} tol={E}
R12 N004 N011 {R7} tol={E}
R3 N008 N004 {R1} tol={E}
C6 N008 0 {C1}
R4 N006 N005 {R4} tol={E}
R8 0 N006 {R5} tol={E}
XU1 N010 N005 N005 opamp Aol=100K GBW=10Meg ;pnba invin)noninvin)out
XU2 N004 N003 N004 opamp Aol=100K GBW=10Meg ;pnba invin)noninvin)out
XU3 N012 N011 N012 opamp Aol=100K GBW=10Meg ;pnba invin)noninvin)out
.ac dec 1000 0.1 1000
.param R1=1.8k
.param C1=0.1u
.param C2=0.015u
.param R2=5.1k
.param R3=3k
.param R4=249
.param R5=10k
.param R6=26.1k
.param E=10
.param A=1
.param R7=422
.param Rnotch=(R6*0.5)+1k
.param Cnotch=C1*2

* LTspice schematic (.asc)
Version 4
SHEET 1 1856 544
WIRE -784 -256 -928 -256
WIRE -736 -256 -784 -256
WIRE -576 -256 -656 -256
WIRE -496 -256 -576 -256
WIRE -336 -256 -416 -256
WIRE -576 -192 -576 -256
WIRE -928 -160 -928 -256
WIRE -336 -144 -336 -256
WIRE -240 -144 -336 -144
WIRE -128 -128 -176 -128
WIRE -240 -112 -288 -112
WIRE 624 -112 432 -112
WIRE 432 -80 432 -112
WIRE 480 -80 432 -80
WIRE 624 -64 624 -112
WIRE 624 -64 544 -64
WIRE 672 -64 624 -64
WIRE 800 -64 752 -64
WIRE 928 -64 800 -64
WIRE -784 -48 -784 -256
WIRE -720 -48 -784 -48
WIRE -608 -48 -656 -48
WIRE -480 -48 -608 -48
WIRE -336 -48 -336 -144
WIRE -336 -48 -416 -48
WIRE -288 -48 -288 -112
WIRE -128 -48 -128 -128
WIRE -128 -48 -288 -48
WIRE 16 -48 -128 -48
WIRE 112 -48 96 -48
WIRE 176 -48 112 -48
WIRE 288 -48 256 -48
WIRE 336 -48 288 -48
WIRE 432 -48 416 -48
WIRE 480 -48 432 -48
WIRE 432 -16 432 -48
WIRE -608 0 -608 -48
WIRE 288 32 288 -48
WIRE -128 48 -128 -48
WIRE 288 144 288 96
WIRE 624 144 624 -64
WIRE 624 144 288 144
WIRE -128 160 -128 128
WIRE -128 160 -480 160
WIRE -608 176 -608 80
WIRE -576 176 -576 -128
WIRE -576 176 -608 176
WIRE -544 176 -576 176
WIRE -400 192 -480 192
WIRE -576 272 -576 176
WIRE -400 272 -400 192
WIRE -400 272 -576 272
FLAG 432 48 0
FLAG -928 -80 0
FLAG -128 240 0
FLAG 112 16 0
FLAG 800 16 0
SYMBOL res 272 -64 R90
SYMATTR InstName R1
SYMATTR Value {R2}
SYMATTR SpiceLine tol={E}
SYMBOL res 432 -64 R90
SYMATTR InstName R2
SYMATTR Value {R3}
SYMATTR SpiceLine tol={E}
SYMBOL cap 272 32 R0
SYMATTR InstName C1
SYMATTR Value {C1}
SYMBOL cap 416 -16 R0
SYMATTR InstName C2
SYMATTR Value {C2}
SYMBOL voltage -928 -176 R0
SYMATTR Value2 AC 1
SYMATTR InstName V1
SYMATTR Value ""
SYMBOL res -640 -272 R90
SYMATTR InstName R5
SYMATTR Value {R6}
SYMATTR SpiceLine tol={A}
SYMBOL res -400 -272 R90
SYMATTR InstName R6
SYMATTR Value {R6}
SYMATTR SpiceLine tol={A}
SYMBOL cap -592 -192 R0
SYMATTR InstName C3
SYMATTR Value {Cnotch}
SYMBOL cap -656 -64 R90
SYMATTR InstName C4
SYMATTR Value {C1}
SYMBOL cap -416 -64 R90
SYMATTR InstName C5
SYMATTR Value {C1}
SYMBOL res -624 -16 R0
SYMATTR InstName R7
SYMATTR Value {Rnotch}
SYMATTR SpiceLine tol={A}
SYMBOL res -144 144 R0
SYMATTR InstName R11
SYMATTR Value {R5}
SYMATTR SpiceLine tol={E}
SYMBOL res -144 32 R0
SYMATTR InstName R12
SYMATTR Value {R7}
SYMATTR SpiceLine tol={E}
SYMBOL res 112 -64 R90
SYMATTR InstName R3
SYMATTR Value {R1}
SYMATTR SpiceLine tol={E}
SYMBOL cap 96 -48 R0
SYMATTR InstName C6
SYMATTR Value {C1}
SYMBOL res 768 -80 R90
SYMATTR InstName R4
SYMATTR Value {R4}
SYMATTR SpiceLine tol={E}
SYMBOL res 816 32 R180
SYMATTR InstName R8
SYMATTR Value {R5}
SYMATTR SpiceLine tol={E}
SYMBOL Opamps\\opamp 512 0 M180
SYMATTR InstName U1
SYMBOL Opamps\\opamp -208 -64 M180
SYMATTR InstName U2
SYMBOL Opamps\\opamp -512 240 R180
SYMATTR InstName U3