Version 4 SHEET 1 1088 852 WIRE 112 -208 -16 -208 WIRE 272 -208 176 -208 WIRE 272 -128 272 -208 WIRE 272 -128 176 -128 WIRE 176 -80 176 -128 WIRE 192 -80 176 -80 WIRE 272 -64 272 -128 WIRE 272 -64 256 -64 WIRE 336 -64 272 -64 WIRE -128 -48 -288 -48 WIRE -16 -48 -16 -208 WIRE -16 -48 -48 -48 WIRE 16 -48 -16 -48 WIRE 128 -48 96 -48 WIRE 192 -48 128 -48 WIRE -288 -32 -288 -48 WIRE 128 -16 128 -48 WIRE -288 80 -288 48 WIRE 128 80 128 48 WIRE 112 160 -16 160 WIRE 272 160 176 160 WIRE 272 240 272 160 WIRE 272 240 176 240 WIRE 176 288 176 240 WIRE 192 288 176 288 WIRE 272 304 272 240 WIRE 272 304 256 304 WIRE 336 304 272 304 WIRE -128 320 -160 320 WIRE -16 320 -16 160 WIRE -16 320 -48 320 WIRE 16 320 -16 320 WIRE 128 320 96 320 WIRE 192 320 128 320 WIRE 128 352 128 320 WIRE 128 448 128 416 WIRE 112 528 -16 528 WIRE 272 528 176 528 WIRE 272 608 272 528 WIRE 272 608 176 608 WIRE 176 656 176 608 WIRE 192 656 176 656 WIRE 272 672 272 608 WIRE 272 672 256 672 WIRE 336 672 272 672 WIRE -128 688 -160 688 WIRE -16 688 -16 528 WIRE -16 688 -48 688 WIRE 16 688 -16 688 WIRE 128 688 96 688 WIRE 192 688 128 688 WIRE 128 720 128 688 WIRE 128 816 128 784 FLAG -288 80 0 FLAG 128 80 0 FLAG 336 -64 out FLAG -288 -48 in FLAG 128 448 0 FLAG 336 304 outa FLAG -160 320 in FLAG 128 816 0 FLAG 336 672 outb FLAG -160 688 in SYMBOL Opamps\\opamp 224 -128 R0 SYMATTR InstName U1 SYMBOL cap 112 -192 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C1 SYMATTR Value 20n SYMBOL cap 112 -16 R0 SYMATTR InstName C2 SYMATTR Value 10n SYMBOL Misc\\EuropeanResistor -144 -32 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R1 SYMATTR Value 11254 SYMBOL Misc\\EuropeanResistor 0 -32 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R2 SYMATTR Value 11254 SYMBOL voltage -288 -48 R0 WINDOW 123 24 124 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value2 AC 1 SYMATTR InstName V1 SYMATTR Value PULSE(0 1 0 1n 1n 10m 20m) SYMBOL Opamps\\opamp 224 240 R0 SYMATTR InstName U2 SYMBOL cap 112 176 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C1a SYMATTR Value 22n SYMBOL cap 112 352 R0 SYMATTR InstName C2a SYMATTR Value 10n SYMBOL Misc\\EuropeanResistor -144 336 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R1a SYMATTR Value 14647 SYMBOL Misc\\EuropeanResistor 0 336 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R2a SYMATTR Value 7861 SYMBOL Opamps\\opamp 224 608 R0 SYMATTR InstName U3 SYMBOL cap 112 544 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C1b SYMATTR Value 22n SYMBOL cap 112 720 R0 SYMATTR InstName C2b SYMATTR Value 10n SYMBOL Misc\\EuropeanResistor -144 704 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R1b SYMATTR Value 7861 SYMBOL Misc\\EuropeanResistor 0 704 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R2b SYMATTR Value 14647 TEXT -296 -624 Left 2 !.ac dec 100 10 10k TEXT 24 -624 Left 2 !.lib opamp.sub TEXT -296 -528 Left 2 ;Matlab, Octave, Scilab \n \nC1 >= 2*C2\n \n-->fg=1e3;wg=2*pi*fg;C1=20e-9;C2=10e-9;\n \n-->R1=1/(wg*C2*sqrt(2)) +/-sqrt(1/(wg*C2*sqrt(2))^2-1/(wg^2*C1*C2))\n R1 = 11253.954 \n \n-->R2=1/(wg^2*R1*C1*C2)\n R2 = 11253.954 TEXT -296 -576 Left 2 ;.tran 0 20m 0 1u TEXT 24 -576 Left 2 !.options plotwinsize=0