Version 4 SHEET 1 1656 984 WIRE 320 0 304 0 WIRE 432 0 368 0 WIRE 368 32 368 0 WIRE 320 48 320 0 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 320 128 320 96 WIRE 368 128 368 112 WIRE 48 144 48 80 WIRE -80 224 -80 192 WIRE 48 224 48 192 WIRE 96 224 96 208 WIRE 272 320 80 320 WIRE 448 320 272 320 WIRE 80 352 80 320 WIRE 272 352 272 320 WIRE -48 464 -80 464 WIRE 80 464 80 432 WIRE 80 464 32 464 WIRE 112 464 80 464 WIRE 144 464 112 464 WIRE 272 464 272 416 WIRE 272 464 224 464 WIRE 304 464 272 464 WIRE 352 464 304 464 WIRE 448 480 448 320 WIRE 448 480 416 480 WIRE 496 480 448 480 WIRE 80 496 80 464 WIRE 352 496 320 496 WIRE 320 528 320 496 WIRE 80 576 80 560 FLAG -80 224 0 FLAG 48 224 0 FLAG 96 224 0 FLAG -16 80 in FLAG 160 80 test FLAG -80 464 in FLAG 496 480 LP FLAG 320 528 0 FLAG 112 464 1 FLAG 304 464 2 FLAG 80 576 0 FLAG 320 128 0 FLAG 368 128 0 FLAG 432 0 testab FLAG 304 0 in SYMBOL voltage -80 96 R0 SYMATTR InstName V1 SYMATTR Value AC 1 SYMBOL e 96 112 R0 SYMATTR InstName E1 SYMATTR Value Laplace=-(R2/R1)/(1+s*(R2+R3+R2*R3/R1)*C1+s*s*R2*R3*C1*C2) SYMBOL Opamps\\opamp 384 416 R0 SYMATTR InstName U1 SYMBOL Misc\\EuropeanResistor -64 480 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R1 SYMATTR Value {R1} SYMBOL Misc\\EuropeanResistor 64 336 R0 SYMATTR InstName R2 SYMATTR Value {R2} SYMBOL cap 256 352 R0 SYMATTR InstName C1 SYMATTR Value {C1} SYMBOL cap 64 496 R0 SYMATTR InstName C2 SYMATTR Value {C2} SYMBOL Misc\\EuropeanResistor 128 480 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R3 SYMATTR Value {R3} SYMBOL e 368 16 R0 SYMATTR InstName E2 SYMATTR Value Laplace=-(R2/R1)/(1+a*s/wg+b*s*s/(wg*wg)) 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 G0=-1\n.param C=10n\n.param C1=C \n.param C2=3*C\n.param R2=(a*C2+sqrt(a*a*C2*C2-4*C1*C2*b*(1-G0)))/(2*wg*C1*C2)\n.param R1=-R2/G0\n.param R3 = b/(wg*wg*C1*C2*R2) 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 in 1 14449.8532221736 \nr2 lp 1 14449.8532221736 \nc1 lp 2 1e-008 \nc2 1 0 3e-008 \nr3 1 2 3611.13768932491 TEXT 288 -216 Left 4 ;C2 > C1*4*b*(1-G0)/a^2