* SPICE netlist
V1 N001 0 AC 1.
R1 W N001 {6*R}
C2 W N003 {C}
C1 N001 N002 {C}
C3 N003 N002 {C}
R2 0 N002 {w*R}
R3 N003 0 {(1-w)*R}
R4 X N001 {6*R}
C4 N001 N004 {C}
C5 X N005 {C}
C6 N005 N004 {C}
R5 0 N004 {x*R}
R6 N005 0 {(1-x)*R}
R7 Y N001 {6*R}
C7 N001 N006 {C}
C8 Y N007 {C}
C9 N007 N006 {C}
R8 0 N006 {y*R}
R9 N007 0 {(1-y)*R}
R10 Z N001 {6*R}
C10 N001 N008 {C}
C11 Z N009 {C}
C12 N009 N008 {C}
R11 0 N008 {z*R}
R12 N009 0 {(1-z)*R}
.ac oct 500 100 10k
.params R=10K C=.1
.params w=.0005 x=.005 y=.05 z=.5

* LTspice schematic (.asc)
Version 4
SHEET 1 1728 304
WIRE -736 -152 -864 -152
WIRE -320 -152 -736 -152
WIRE 96 -152 -320 -152
WIRE 512 -152 96 -152
WIRE -864 -136 -864 -152
WIRE -736 -88 -736 -152
WIRE -624 -88 -736 -88
WIRE -416 -88 -544 -88
WIRE -384 -88 -416 -88
WIRE -320 -88 -320 -152
WIRE -208 -88 -320 -88
WIRE 0 -88 -128 -88
WIRE 32 -88 0 -88
WIRE 96 -88 96 -152
WIRE 192 -88 96 -88
WIRE 384 -88 272 -88
WIRE 416 -88 384 -88
WIRE 512 -88 512 -152
WIRE 624 -88 512 -88
WIRE 832 -88 704 -88
WIRE 864 -88 832 -88
WIRE -736 -72 -736 -88
WIRE -416 -72 -416 -88
WIRE -320 -72 -320 -88
WIRE 0 -72 0 -88
WIRE 96 -72 96 -88
WIRE 384 -72 384 -88
WIRE 512 -72 512 -88
WIRE 832 -72 832 -88
WIRE -864 -24 -864 -56
WIRE -736 24 -736 -8
WIRE -608 24 -736 24
WIRE -416 24 -416 -8
WIRE -416 24 -544 24
WIRE -320 24 -320 -8
WIRE -192 24 -320 24
WIRE 0 24 0 -8
WIRE 0 24 -128 24
WIRE 96 24 96 -8
WIRE 208 24 96 24
WIRE 384 24 384 -8
WIRE 384 24 272 24
WIRE 512 24 512 -8
WIRE 640 24 512 24
WIRE 832 24 832 -8
WIRE 832 24 704 24
WIRE -736 104 -736 24
WIRE -704 104 -736 104
WIRE -576 104 -624 104
WIRE -528 104 -576 104
WIRE -416 104 -416 24
WIRE -416 104 -448 104
WIRE -320 104 -320 24
WIRE -288 104 -320 104
WIRE -160 104 -208 104
WIRE -112 104 -160 104
WIRE 0 104 0 24
WIRE 0 104 -32 104
WIRE 96 104 96 24
WIRE 128 104 96 104
WIRE 240 104 208 104
WIRE 272 104 240 104
WIRE 384 104 384 24
WIRE 384 104 352 104
WIRE 512 104 512 24
WIRE 528 104 512 104
WIRE 672 104 608 104
WIRE 720 104 672 104
WIRE 832 104 832 24
WIRE 832 104 800 104
WIRE -576 152 -576 104
WIRE -160 152 -160 104
WIRE 240 152 240 104
WIRE 672 152 672 104
FLAG -864 -24 0
FLAG -576 152 0
FLAG -384 -88 W
FLAG -160 152 0
FLAG 32 -88 X
FLAG 240 152 0
FLAG 416 -88 Y
FLAG 672 152 0
FLAG 864 -88 Z
SYMBOL voltage -864 -152 R0
SYMATTR InstName V1
SYMATTR Value AC 1.
SYMBOL res -528 -104 R90
SYMATTR InstName R1
SYMATTR Value {6*R}
SYMBOL cap -432 -72 R0
SYMATTR InstName C2
SYMATTR Value {C}
SYMBOL cap -752 -72 R0
SYMATTR InstName C1
SYMATTR Value {C}
SYMBOL cap -544 8 R90
SYMATTR InstName C3
SYMATTR Value {C}
SYMBOL res -608 88 R90
SYMATTR InstName R2
SYMATTR Value {w*R}
SYMBOL res -432 88 R90
SYMATTR InstName R3
SYMATTR Value {(1-w)*R}
SYMBOL res -112 -104 R90
SYMATTR InstName R4
SYMATTR Value {6*R}
SYMBOL cap -336 -72 R0
SYMATTR InstName C4
SYMATTR Value {C}
SYMBOL cap -16 -72 R0
SYMATTR InstName C5
SYMATTR Value {C}
SYMBOL cap -128 8 R90
SYMATTR InstName C6
SYMATTR Value {C}
SYMBOL res -192 88 R90
SYMATTR InstName R5
SYMATTR Value {x*R}
SYMBOL res -16 88 R90
SYMATTR InstName R6
SYMATTR Value {(1-x)*R}
SYMBOL res 288 -104 R90
SYMATTR InstName R7
SYMATTR Value {6*R}
SYMBOL cap 80 -72 R0
SYMATTR InstName C7
SYMATTR Value {C}
SYMBOL cap 368 -72 R0
SYMATTR InstName C8
SYMATTR Value {C}
SYMBOL cap 272 8 R90
SYMATTR InstName C9
SYMATTR Value {C}
SYMBOL res 224 88 R90
SYMATTR InstName R8
SYMATTR Value {y*R}
SYMBOL res 368 88 R90
SYMATTR InstName R9
SYMATTR Value {(1-y)*R}
SYMBOL res 720 -104 R90
SYMATTR InstName R10
SYMATTR Value {6*R}
SYMBOL cap 496 -72 R0
SYMATTR InstName C10
SYMATTR Value {C}
SYMBOL cap 816 -72 R0
SYMATTR InstName C11
SYMATTR Value {C}
SYMBOL cap 704 8 R90
SYMATTR InstName C12
SYMATTR Value {C}
SYMBOL res 624 88 R90
SYMATTR InstName R11
SYMATTR Value {z*R}
SYMBOL res 816 88 R90
SYMATTR InstName R12
SYMATTR Value {(1-z)*R}