Version 4 SHEET 1 1656 984 WIRE -16 80 -80 80 WIRE 48 80 -16 80 WIRE 160 80 96 80 WIRE -80 112 -80 80 WIRE 96 128 96 80 WIRE 48 144 48 80 WIRE -80 224 -80 192 WIRE 48 224 48 192 WIRE 96 224 96 208 WIRE 448 336 80 336 WIRE 80 368 80 336 WIRE 448 416 448 336 WIRE 448 416 352 416 WIRE 352 464 352 416 WIRE 368 464 352 464 WIRE 448 480 448 416 WIRE 448 480 432 480 WIRE 512 480 448 480 WIRE -48 496 -80 496 WIRE 80 496 80 432 WIRE 80 496 32 496 WIRE 128 496 80 496 WIRE 256 496 208 496 WIRE 368 496 256 496 WIRE 256 528 256 496 WIRE 256 624 256 592 FLAG -80 224 0 FLAG 48 224 0 FLAG 96 224 0 FLAG -16 80 in FLAG 160 80 test FLAG -80 496 in FLAG 512 480 LP FLAG 256 624 0 SYMBOL voltage -80 96 R0 SYMATTR InstName V1 SYMATTR Value AC 1 SYMBOL e 96 112 R0 SYMATTR InstName E1 SYMATTR Value Laplace=1/(1+s*(R1+R2)*C2+s*s*R1*R2*C1*C2) SYMBOL Opamps\\opamp 400 416 R0 SYMATTR InstName U1 SYMBOL Misc\\EuropeanResistor -64 512 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R1 SYMATTR Value {R1} SYMBOL Misc\\EuropeanResistor 112 512 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R2 SYMATTR Value {R2} SYMBOL cap 64 368 R0 SYMATTR InstName C1 SYMATTR Value {C1} SYMBOL cap 240 528 R0 SYMATTR InstName C2 SYMATTR Value {C2} TEXT -80 -48 Left 2 !.lib opamp.sub TEXT -80 -8 Left 2 !.ac dec 100 100 10k TEXT -80 -320 Left 2 !.param fg=1000\n.param wg=2*pi*fg\n.param a=1.3617 b=0.618\n.param C=10n\n.param C1=2*C \n.param C2=C\n.param R1=a/(2*wg*C2)+sqrt( (a/(2*wg*C2))**2-b/(wg*wg*C1*C2) )\n.param R2=b/(wg*wg*C1*C2*R1) TEXT 32 -1008 Left 4 ;Lowpass F(s) = 1/(1+a*P + b*P^2) TEXT -64 -768 Left 2 ;Bessel\n \nOrdnung i ai bi\n \n1 1 1,0000 0,0000\n \n2 1 1,3617 0,6180\n \n3 1 0,7560 0,0000 \n- 2 0,9996 0,4772\n \n4 1 1,3397 0,4889\n- 2 0,7743 0,3890 TEXT 200 -768 Left 2 ;Butterworth\n \nOrdnung i ai bi\n \n1 1 1,0000 0,0000\n \n2 1 1,4142 1,0000\n \n3 1 1,0000 0,0000\n- 2 1,0000 1,0000\n \n4 1 1,8478 1,0000\n- 2 0,7654 1,0000 TEXT 448 -792 Left 2 ;Tschebyscheff\n(0,5 dB Welligkeit)\n \nOrdnung i ai bi\n \n1 1 1,0000 0,0000\n \n2 1 1,3614 1,3827\n \n3 1 1,8626 0,0000\n- 2 0,6402 1,1931\n \n4 1 2,6282 3,4341\n- 2 0,3648 1,1509 TEXT 704 -792 Left 2 ;Tschebyscheff\n(3 dB Welligkeit)\n \nOrdnung i ai bi\n \n1 1 1,0000 0,0000\n \n2 1 1,0650 1,9305\n \n3 1 3,3496 0,0000\n- 2 0,3559 1,1923\n \n4 1 2,1853 5,5339\n- 2 0,1964 1,2009 TEXT -56 -944 Left 2 ;Literatur: http://www.fbeit.htwk-leipzig.de/~reinhold/Elektronik_Uni_Lpz/EL2_Kap_3.pdf\nProf. Dr. Wolfgang Reinhold 24/24\nHTWK Leipzig\nFakultät Elektrotechnik und Informationstechnik Kap_3_Filter.docx, 20.05.2011 TEXT 584 392 Left 2 ;View -> SPICE Error Log\nr1 hp 1 17534.0846284979 \nr2 2 0 23375.9187914952 \nc1 in 1 1e-008 \nc2 1 2 1e-008 TEXT 272 -272 Left 4 ;C1 > C2*4*b/a^2