Version 4 SHEET 1 1324 680 WIRE 64 16 64 -64 WIRE 64 128 64 96 WIRE 64 256 64 224 WIRE 64 368 64 336 WIRE 96 -64 64 -64 WIRE 96 224 64 224 WIRE 112 -64 96 -64 WIRE 112 224 96 224 WIRE 224 -64 192 -64 WIRE 224 -64 224 -160 WIRE 240 -160 224 -160 WIRE 256 -64 224 -64 WIRE 256 16 256 -64 WIRE 256 32 256 16 WIRE 256 128 256 96 WIRE 288 -64 256 -64 WIRE 336 -160 320 -160 WIRE 368 16 256 16 WIRE 416 -160 400 -160 WIRE 416 -64 368 -64 WIRE 416 -64 416 -160 WIRE 480 16 432 16 WIRE 544 16 480 16 WIRE 656 16 624 16 WIRE 656 32 656 16 WIRE 656 128 656 96 WIRE 704 16 656 16 WIRE 752 -64 416 -64 WIRE 752 16 704 16 WIRE 752 16 752 -64 WIRE 752 32 752 16 WIRE 752 128 752 112 FLAG 96 -64 i FLAG 96 224 f FLAG 64 368 0 FLAG 64 128 0 FLAG 656 128 0 FLAG 752 128 0 FLAG 480 16 x FLAG 704 16 o FLAG 256 128 0 SYMBOL bv 64 240 R0 WINDOW 3 -24 168 Left 0 SYMATTR Value V=f1*{f2/f1}**(time/Td) SYMATTR InstName Bf SYMBOL bv 64 0 R0 WINDOW 3 -24 168 Left 0 WINDOW 123 -66 214 Left 0 SYMATTR Value V=Vdc+Vp*sin({2*pi*Td/ln(f2/f1)*f1}*{f2/f1}**(time/Td)) SYMATTR InstName Bi SYMBOL ind 528 32 R270 WINDOW 0 32 56 VTop 0 WINDOW 3 5 56 VBottom 0 SYMATTR InstName Lo SYMATTR Value 30µ SYMATTR SpiceLine Rser=10m Rpar=10k SYMBOL cap 640 32 R0 SYMATTR InstName Co SYMATTR Value 680n SYMBOL res 736 16 R0 SYMATTR InstName Ro SYMATTR Value 6 SYMBOL res 208 -80 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R2 SYMATTR Value 1k8 SYMBOL res 384 -80 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R1 SYMATTR Value 8k2 SYMBOL res 336 -176 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R3 SYMATTR Value 1k0 SYMBOL cap 400 -176 R90 WINDOW 0 0 32 VBottom 0 WINDOW 3 32 32 VTop 0 SYMATTR InstName C1 SYMATTR Value 150p SYMBOL cap 240 32 R0 SYMATTR InstName C2 SYMATTR Value 33p SYMBOL Digital\\inv 368 -48 R0 WINDOW 3 0 112 Left 0 WINDOW 123 0 144 Left 0 WINDOW 39 0 176 Left 0 SYMATTR Value tripdt=1n td=200n SYMATTR Value2 Cout=33n Rout=10m SYMATTR SpiceLine Vhigh=45 Vlow=-45 SYMATTR InstName A2 TEXT 368 384 Left 0 !.tran 0 {Td} 10u uic TEXT 248 320 Left 0 !.param Vdc=0 Vp=1 f1=2k5 f2=250k Td=4m TEXT 472 -224 Left 0 ;To plot frequency on the\nhorizontal axis change\nthe quantity plotted to\n"V(f)*1Hz/1V" and click\n"Logarithmic" TEXT 704 -32 Center 0 ;35kHz TEXT 480 -32 Center 0 ;400kHz TEXT 64 -336 Left 0 ;This circuit demonstrates the use of a swept sine source to test \nthe large signal frequency response of an idealized UcD180 style \nself oscillatiing class D amplifier, as a function of input amplitude,\ninput offset, and output load. TEXT 256 232 Left 0 ;Sweep Parameters:\nf1 = start freq f2= stop freq Td = sweep duration\nVp = sine peak Vdc = sine offset TEXT 408 -392 Center 0 ;Swept Sine Analysis - analogspiceman 2005 TEXT 248 352 Left 0 !.step param Vdc list 0 -4 -8 RECTANGLE Normal 672 -368 144 -416 1