Version 4
SHEET 1 2392 680
WIRE -208 -1088 -208 -1104
WIRE -432 -1040 -528 -1040
WIRE -528 -992 -528 -1040
WIRE -512 -992 -528 -992
WIRE -432 -976 -432 -1040
WIRE -432 -976 -448 -976
WIRE -384 -976 -432 -976
WIRE -336 -976 -384 -976
WIRE -208 -976 -208 -1008
WIRE -208 -976 -256 -976
WIRE -192 -976 -208 -976
WIRE -624 -960 -656 -960
WIRE -512 -960 -544 -960
WIRE -208 -944 -208 -976
WIRE -624 -848 -656 -848
WIRE -528 -848 -544 -848
WIRE -208 -848 -208 -864
FLAG -384 -976 Vout
FLAG -656 -960 0
FLAG -192 -976 0
FLAG -480 -1008 V+
FLAG -480 -944 V-
FLAG -656 -848 0
FLAG -208 -1104 V+
FLAG -208 -848 V-
SYMBOL Misc\\signal -528 -960 R90
WINDOW 0 -32 56 VBottom 2
WINDOW 3 32 56 VTop 2
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName Vsine
SYMATTR Value SINE(0 1 {Freq} 0)
SYMBOL res -352 -960 R270
WINDOW 0 32 56 VTop 2
WINDOW 3 0 56 VBottom 2
SYMATTR InstName Load
SYMATTR Value 1k
SYMBOL Misc\\signal -528 -848 M270
WINDOW 0 -32 56 VBottom 2
WINDOW 3 32 56 VTop 2
WINDOW 123 -4 56 VBottom 2
WINDOW 39 -4 56 VBottom 2
SYMATTR InstName Vsquare
SYMATTR Value PULSE(.1 -.1 0 10n 10n {.5/Freq-10p} {1/Freq})
SYMBOL Misc\\battery -208 -1104 R0
SYMATTR InstName V1
SYMATTR Value 18
SYMBOL Misc\\battery -208 -960 R0
SYMATTR InstName V2
SYMATTR Value 18
SYMBOL Opamps\\UniversalOpamp2 -480 -976 R0
SYMATTR InstName U2
TEXT -1304 -720 Left 2 !;ac dec 100 .001 1000meg
TEXT -1304 -1056 Left 2 !.options plotwinsize=0\n.options method=gear\n.options numdgt=7\n.param Freq=1k\n.param numcyc=10\n.param dlycyc=0\n.param FFT=32786\n.param simtime=(dlycyc+numcyc)/Freq\n.param dlytime=dlycyc/Freq\n.param numsampl=simtime/Freq/((simtime/numcyc)*FFT)\n.four {Freq} V(Vout)
TEXT -1304 -744 Left 2 !.tran 0 {simtime} {dlytime} {numsampl}
TEXT -1192 -648 Left 2 ;The first 3 lines set simulation to best accuracy.\nPlotwinsize turns off compression\nMethod=gear is important for realistic RF.\nNumdgt sets internal accuracy to double. Set to 6 for normal accuracy.\nFreq is the test frequency.\nNumcyc is the number of test cycles plotted.\nDlycyc is the number of "warm-up" cycles before the waveform is plotted. \nIncrease this if your FFT shows a too high noise floor.\nFFT is the number of data points used in simulation. This should equal the number \nof points used when you do an FFT. The more points, the higher the bandwidth of \nthe FFT. This won't directly impact accuracy unless your number of points is not \nvery high.
TEXT -1192 -296 Left 2 ;If your amp has trouble simulating, set dlycyc to 0 so you can see the warm-up \nbehavior. If your circuit latches or oscillates you may never get usable output. \nFor this reason I usually leave numcyc=0 while setting up the circuit and making \nsure it works properly.\nFor some circuits, if the input signal is present during warm-up, it will latch the circuit.\nTo prevent this, put "{dlytime}" in the "Tdelay" field of the input voltage source.\nThis will mute the input until the warm-up period is over.
TEXT -1192 -88 Left 2 ;To simulate square response, switch the signal sources. The risetime for the \nsquare source is 10nS, fast enough to reveal problem/latching behavior. A \nrisetime of several uS is more common, but is not always enough.
TEXT -760 -728 Left 2 ;BTW, this opamp will have no distortion, don't bother!