Version 4 SHEET 1 1364 680 WIRE 512 -336 496 -336 WIRE 688 -336 592 -336 WIRE 752 -336 688 -336 WIRE 176 -304 144 -304 WIRE 288 -304 256 -304 WIRE 320 -304 288 -304 WIRE 288 -288 288 -304 WIRE 960 -288 928 -288 WIRE 144 -272 144 -304 WIRE 752 -272 720 -272 WIRE 96 -208 80 -208 WIRE 144 -144 144 -192 WIRE 176 -144 144 -144 WIRE 288 -144 288 -160 WIRE 288 -144 256 -144 WIRE 512 -144 496 -144 WIRE 688 -144 592 -144 WIRE 752 -144 688 -144 WIRE 144 -128 144 -144 WIRE 960 -96 928 -96 WIRE 720 -80 720 -272 WIRE 752 -80 720 -80 WIRE 512 48 496 48 WIRE 688 48 592 48 WIRE 752 48 688 48 WIRE 960 96 928 96 WIRE 352 112 320 112 WIRE 720 112 720 -80 WIRE 752 112 720 112 WIRE 112 176 80 176 WIRE 144 176 112 176 WIRE 304 176 288 176 WIRE 320 176 320 112 WIRE 320 176 304 176 WIRE 352 176 320 176 WIRE 688 176 416 176 WIRE 720 176 720 112 WIRE 720 176 688 176 WIRE 80 208 80 176 WIRE 720 208 720 176 WIRE 864 208 720 208 WIRE 960 224 928 224 WIRE 304 240 288 240 WIRE 320 240 304 240 WIRE 512 256 496 256 WIRE 608 256 592 256 WIRE 720 256 720 208 WIRE 752 256 720 256 WIRE 832 256 816 256 WIRE 864 256 832 256 WIRE 80 320 80 288 WIRE 848 384 832 384 WIRE 944 384 928 384 FLAG 96 -256 s IOPIN 96 -256 In FLAG 112 176 f FLAG 80 320 0 FLAG 320 -304 o IOPIN 320 -304 Out FLAG 304 176 S FLAG 496 -144 0 FLAG 688 -336 1 FLAG 304 240 C FLAG 496 48 0 FLAG 688 -144 2 FLAG 960 224 R FLAG 832 384 0 FLAG 944 384 THD IOPIN 944 384 Out FLAG 960 -96 So FLAG 960 96 Co FLAG 496 -336 0 FLAG 960 -288 To FLAG 496 256 0 FLAG 608 256 per FLAG 80 -208 0 FLAG 144 -128 0 FLAG 688 176 clk FLAG 688 48 3 FLAG 832 256 4 FLAG 352 112 s IOPIN 352 112 Out SYMBOL bv 80 192 R0 WINDOW 3 -32 160 Left 0 WINDOW 0 -32 8 Left 0 SYMATTR Value V={f2/f1}**((time-2/f1)/Ts-1) SYMATTR InstName B1 SYMBOL SpecialFunctions\\modulate2 144 176 R0 WINDOW 3 0 112 Left 0 WINDOW 123 0 130 Left 0 WINDOW 39 0 148 Left 0 WINDOW 0 0 -46 Left 0 SYMATTR Value space=0 mark={f2} SYMATTR Value2 Vhigh={sqrt(2)} SYMATTR SpiceLine Vlow={-sqrt(2)} SYMATTR InstName A1 SYMBOL zener 272 -224 M180 WINDOW 0 40 48 Left 0 WINDOW 3 40 24 Left 0 SYMATTR InstName D1 SYMATTR Value 1N750 SYMATTR Description Diode SYMATTR Type diode SYMBOL zener 304 -224 M0 WINDOW 0 -8 16 Right 0 WINDOW 3 -8 40 Right 0 SYMATTR InstName D2 SYMATTR Value 1N750 SYMATTR Description Diode SYMATTR Type diode SYMBOL voltage 160 -144 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 -32 56 VBottom 0 WINDOW 123 0 0 Left 0 WINDOW 39 -55 56 VBottom 0 SYMATTR InstName V1 SYMATTR Value {Vdc} SYMBOL Digital\\buf1 352 112 R0 WINDOW 3 0 96 Left 0 WINDOW 123 0 114 Left 0 WINDOW 0 0 34 Left 0 SYMATTR Value tripdt=1n SYMATTR Value2 ref=0 SYMATTR InstName A2 SYMBOL res 272 -320 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R1 SYMATTR Value 1k SYMBOL e 144 -288 R0 WINDOW 0 40 47 Left 0 WINDOW 3 37 75 Left 0 SYMATTR InstName E1 SYMATTR Value {K} SYMBOL SpecialFunctions\\sample 832 -304 R0 WINDOW 3 16 80 Center 0 WINDOW 0 8 -48 Center 0 SYMATTR Value tripdt=1n SYMATTR InstName A3 SYMBOL SpecialFunctions\\sample 832 -112 R0 WINDOW 3 16 80 Center 0 WINDOW 0 8 -48 Center 0 SYMATTR Value tripdt=1n SYMATTR InstName A4 SYMBOL SpecialFunctions\\sample 832 80 R0 WINDOW 3 16 80 Center 0 WINDOW 0 8 -48 Center 0 SYMATTR Value tripdt=1n SYMATTR InstName A5 SYMBOL bv 608 -336 M270 WINDOW 3 -32 56 VBottom 0 WINDOW 0 32 56 VTop 0 SYMATTR Value V=sqrt(sdt(V(o)**2,0,V(R))/V(per)) SYMATTR InstName B2 SYMBOL bv 608 -144 M270 WINDOW 3 -32 56 VBottom 0 WINDOW 0 32 56 VTop 0 SYMATTR Value V=sdt(V(S)*V(o),0,V(R))/V(per) SYMATTR InstName B3 SYMBOL bv 608 48 M270 WINDOW 3 -32 56 VBottom 0 WINDOW 0 32 56 VTop 0 SYMATTR Value V=sdt(V(C)*V(o),0,V(R))/V(per) SYMATTR InstName B4 SYMBOL bv 608 256 M270 WINDOW 3 -32 56 VBottom 0 WINDOW 0 32 56 VTop 0 SYMATTR Value V=sdt(1,0,V(R)) SYMATTR InstName B5 SYMBOL bv 944 384 M270 WINDOW 3 -32 56 VBottom 0 WINDOW 0 32 56 VTop 0 SYMATTR Value V=100*abs(1-hypot(V(So),V(Co)))/V(To) SYMATTR InstName B6 SYMBOL Digital\\inv 752 192 R0 WINDOW 0 0 34 Left 0 WINDOW 3 0 96 Left 0 WINDOW 123 0 114 Left 0 SYMATTR InstName A6 SYMATTR Value tripdt=1n SYMATTR Value2 Td=4n SYMBOL Digital\\and 896 176 R0 WINDOW 3 -32 112 Left 0 WINDOW 0 -32 18 Left 0 WINDOW 123 -32 130 Left 0 SYMATTR Value tripdt=0n3 SYMATTR InstName A7 SYMATTR Value2 Td=3n TEXT 40 416 Left 0 !.tran 0 {Ts+2/f1} {2/f1} {100u/f1} uic TEXT 40 392 Left 0 !.param f1=20 f2=20k Ts=2000m TEXT 400 376 Left 0 ;To plot freq on the horiz axis \nchange the quantity plotted to \n"V(f)*Hz/1V" (e.g. f2=20k) \nand click "Logarithmic" TEXT 48 32 Left 0 ;Sweep Parameters:\nf1 = start freq f2= stop freq\nTs = sweep duration TEXT 112 -24 Left 0 ;.step param Vdc list 0 4 8 TEXT 40 440 Left 0 !.options plotwinsize=0 numdgt=8 reltol=10u TEXT 112 -48 Left 0 ;.step param K list 10m .1 1 10 TEXT 112 -72 Left 0 !.param Vdc=0 K=1 TEXT 216 -368 Center 0 ;Nonlinear Test "Amplifier" TEXT 968 152 Center 0 ;Delayed\nIntegrator\nReset TEXT 968 24 Center 0 ;"DFT"\ncosine\noutput TEXT 968 -168 Center 0 ;"DFT"\nsine\noutput TEXT 968 -360 Center 0 ;Averaged\nraw\noutput TEXT 552 192 Center 0 ;Cycle sample period TEXT 552 152 Center 0 ;Cycle synchronous S/H clock TEXT 968 328 Center 0 ;THD output\n(in percent) TEXT 552 -208 Center 0 ;"DFT" sine integrator TEXT 552 -16 Center 0 ;"DFT" cosine integrator TEXT 552 -272 Center 0 ;cycle-by-cycle average TEXT 512 -424 Center 0 ;Swept Sine Audio THD Measurement Generator - Rev 0 - Aug 2006 - analogspiceman@yahoo.com TEXT 200 104 Center 0 ;Swept Sine-Cosine Source RECTANGLE Normal 384 0 48 -352 1