Version 4
SHEET 1 880 680
WIRE 32 80 -240 80
WIRE 112 80 32 80
WIRE 224 80 192 80
WIRE 352 80 288 80
WIRE 480 80 352 80
WIRE 544 80 480 80
WIRE 32 128 32 80
WIRE 32 128 -16 128
WIRE 80 128 32 128
WIRE 352 128 352 80
WIRE 352 128 304 128
WIRE 400 128 352 128
WIRE -240 160 -240 80
WIRE -16 160 -16 128
WIRE 304 160 304 128
WIRE 544 160 544 80
WIRE 80 176 80 128
WIRE 400 176 400 128
WIRE -16 272 -16 240
WIRE 32 272 -16 272
WIRE 80 272 80 240
WIRE 80 272 32 272
WIRE 304 272 304 240
WIRE 352 272 304 272
WIRE 400 272 400 240
WIRE 400 272 352 272
WIRE -240 320 -240 240
WIRE 32 320 32 272
WIRE 32 320 -240 320
WIRE 208 320 32 320
WIRE 352 320 352 272
WIRE 352 320 208 320
WIRE 544 320 544 240
WIRE 544 320 352 320
WIRE 208 368 208 320
FLAG 208 368 0
FLAG 480 80 out
SYMBOL ind 0 144 M0
SYMATTR InstName L2
SYMATTR Value {L2}
SYMBOL ind 320 144 M0
SYMATTR InstName L3
SYMATTR Value {L2}
SYMBOL ind 208 96 M270
WINDOW 0 32 56 VTop 2
WINDOW 3 5 56 VBottom 2
SYMATTR InstName L1
SYMATTR Value {L1}
SYMBOL cap 64 176 R0
SYMATTR InstName C2
SYMATTR Value {C2}
SYMBOL cap 384 176 R0
SYMATTR InstName C3
SYMATTR Value {C2}
SYMBOL cap 288 64 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C1
SYMATTR Value {C1}
SYMBOL voltage -240 144 R0
WINDOW 123 24 124 Left 2
WINDOW 39 24 92 Left 2
SYMATTR Value2 AC 2
SYMATTR SpiceLine Rser=50
SYMATTR InstName V1
SYMATTR Value ""
SYMBOL res 528 144 R0
SYMATTR InstName RLast
SYMATTR Value 50
TEXT -184 -280 Left 2 !.param Zo=50\n.param pi=3.14159\n.param f1=0.8Meg\n.param f2=1.2Meg\n.param L1=Zo/(pi*(f2-f1))*a\n.param L2=Zo*(f2-f1)/(4*pi*f1*f2)*b\n.param C1=(f2-f1)/(4*pi*f1*f2*Zo)/a\n.param C2=1/(pi*Zo*(f2-f1))/b
TEXT -184 -528 Left 2 ;Zo = characteristic impedance in ohms\nC1 and C2 = Capacitance in Farads\nL1 and L2 = Inductance in Henries\nf1 and f2 = Cut off frequencies in Hertz\nDie -3dB Grenzfrequenzen liegen bei f1 bzw. f2.
TEXT -184 -40 Left 2 !.ac oct 500 100k 10Meg
TEXT -16 -352 Left 2 ;.param a=1 b=2
TEXT 416 -344 Left 2 ;.param a=0.5 b=1
TEXT 256 -296 Left 2 !.param a=table(n,1,1,2,1,3,0.5)\n.param b=table(n,1,1,2,2,3,1)\n.step param n 1 3 1
TEXT 256 -200 Left 2 !.param n=1
TEXT -168 -352 Left 4 ;FLAT
TEXT 240 -344 Left 2 ;1dB ripple -->
RECTANGLE Normal 192 -320 -192 -384