Version 4 SHEET 1 1228 1256 WIRE 144 -16 -16 -16 WIRE 256 -16 144 -16 WIRE 336 -16 256 -16 WIRE 448 -16 416 -16 WIRE 496 -16 448 -16 WIRE 608 -16 576 -16 WIRE 144 32 144 -16 WIRE 256 32 256 -16 WIRE 512 112 512 96 WIRE 48 128 48 112 WIRE 448 128 448 -16 WIRE 480 128 448 128 WIRE -16 144 -16 -16 WIRE 16 144 -16 144 WIRE 608 144 608 -16 WIRE 608 144 544 144 WIRE 640 144 608 144 WIRE 656 144 640 144 WIRE 768 144 720 144 WIRE 912 144 848 144 WIRE 1040 144 912 144 WIRE 1120 144 1040 144 WIRE 1168 144 1120 144 WIRE 144 160 144 96 WIRE 144 160 80 160 WIRE 256 160 256 96 WIRE 256 160 144 160 WIRE 320 160 256 160 WIRE 416 160 384 160 WIRE 480 160 416 160 WIRE -192 176 -240 176 WIRE -48 176 -192 176 WIRE 16 176 -48 176 WIRE 416 192 416 160 WIRE 512 192 512 176 WIRE 912 192 912 144 WIRE 1168 192 1168 144 WIRE -240 208 -240 176 WIRE -48 208 -48 176 WIRE 48 208 48 192 WIRE 1040 208 1040 144 WIRE 416 304 416 272 WIRE -240 320 -240 288 WIRE -48 320 -48 288 WIRE 512 320 512 304 WIRE 656 320 656 304 WIRE 912 336 912 272 WIRE 1040 336 1040 272 WIRE 1168 336 1168 272 WIRE 512 416 512 400 WIRE 656 416 656 400 FLAG 416 304 0 FLAG -48 320 0 FLAG -240 320 0 FLAG 512 96 vcc FLAG 512 192 vss FLAG 48 208 vss FLAG 48 112 vcc FLAG 656 416 0 FLAG 512 416 0 FLAG 512 304 vcc FLAG 656 304 vss FLAG 912 336 0 FLAG 1040 336 0 FLAG 1168 336 0 FLAG 1120 144 out FLAG -192 176 in FLAG 640 144 op SYMBOL Opamps\\LT1006A 48 96 R0 SYMATTR InstName U1 SYMBOL Opamps\\LT1006A 512 80 R0 SYMATTR InstName U2 SYMBOL diode 128 32 R0 SYMATTR InstName D1 SYMATTR Value 1N4148 SYMBOL cap 240 32 R0 SYMATTR InstName C1 SYMATTR Value 47p SYMBOL diode 320 176 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName D2 SYMATTR Value 1N4148 SYMBOL Misc\\EuropeanResistor 400 176 R0 SYMATTR InstName R4 SYMATTR Value 10k SYMBOL Misc\\EuropeanResistor 320 0 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R2 SYMATTR Value 10k SYMBOL Misc\\EuropeanResistor 480 0 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R3 SYMATTR Value 10k SYMBOL voltage -240 192 R0 WINDOW 3 23 92 Left 2 WINDOW 123 0 0 Left 2 WINDOW 39 0 0 Left 2 SYMATTR Value SINE(0 1 {f0/2}) SYMATTR InstName V1 SYMBOL Misc\\EuropeanResistor -64 192 R0 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL voltage 512 304 R0 SYMATTR InstName V2 SYMATTR Value 8 SYMBOL voltage 656 304 R0 SYMATTR InstName V3 SYMATTR Value -8 SYMBOL cap 656 160 R270 WINDOW 0 32 32 VTop 2 WINDOW 3 0 32 VBottom 2 SYMATTR InstName C2 SYMATTR Value 22u SYMBOL Misc\\EuropeanResistor 752 160 R270 WINDOW 0 27 56 VTop 2 WINDOW 3 5 56 VBottom 2 SYMATTR InstName R5 SYMATTR Value 1k SYMBOL ind 896 176 R0 SYMATTR InstName L1 SYMATTR Value {L} SYMBOL cap 1024 208 R0 SYMATTR InstName C3 SYMATTR Value {C} SYMBOL Misc\\EuropeanResistor 1152 176 R0 SYMATTR InstName R6 SYMATTR Value 1k TEXT -224 -232 Left 2 !.tran 0 200m 0 0.1m TEXT 712 -232 Left 2 ;Formeln/Herleitung\nQ = R/sqrt(L/C) -> Q^2*L/C = R^2 \nL = R^2*C/Q^2\n(2*pi*f0)^2=1/(L*C) -> C=1/((2*pi*f0)^2*L)\nC=Q/(2*pi*f0*R) TEXT 80 -232 Left 2 !.param R=500 ; 1k||1k\n.param Q=5\n.param f0=200\n.param C=Q/(2*pi*f0*R)\n.param L=R**2*C/Q**2 TEXT 400 -232 Left 2 !.meas C_ param C\n.meas L_ param L TEXT -224 -200 Left 2 !.options plotwinsize=0 TEXT -224 -168 Left 2 !.four {f0} V(out) TEXT -168 624 Left 2 ;.step q=1 THD: 11.5%\n.step q=2 THD: 6.5%\n.step q=3 THD: 4.5%\n.step q=4 THD: 3.4%\n.step q=5 THD: 2.7%\n.step q=6 THD: 2.27%\n.step q=7 THD: 1.95%\n.step q=8 THD: 1.71%\n.step q=9 THD: 1.51%\n.step q=10 THD: 1.36% TEXT -184 464 Left 4 ;View -> SPICE Errorlog TEXT -224 -128 Left 2 !.step param Q 1 10 1 TEXT 304 576 Left 2 ;Measurement: c_\n step c\n 1 1.59155e-006\n 2 3.1831e-006\n 3 4.77465e-006\n 4 6.3662e-006\n 5 7.95775e-006\n 6 9.5493e-006\n 7 1.11408e-005\n 8 1.27324e-005\n 9 1.43239e-005\n 10 1.59155e-005 TEXT 368 528 Left 4 ;C(Q) TEXT 720 576 Left 2 ;Measurement: l_\n step l\n 1 0.397887\n 2 0.198944\n 3 0.132629\n 4 0.0994718\n 5 0.0795775\n 6 0.0663146\n 7 0.0568411\n 8 0.0497359\n 9 0.0442097\n 10 0.0397887 TEXT 776 528 Left 4 ;L(Q) TEXT -112 560 Left 4 ;THD