Version 4
SHEET 1 880 680
WIRE -336 -48 -384 -48
WIRE -208 -48 -336 -48
WIRE 112 -48 -80 -48
WIRE -384 0 -384 -48
WIRE -384 160 -384 80
FLAG 112 -48 out
FLAG -336 -48 in
FLAG -384 160 0
SYMBOL voltage -384 -16 R0
WINDOW 123 24 124 Left 2
WINDOW 39 0 0 Left 2
SYMATTR Value2 AC 1
SYMATTR InstName V1
SYMATTR Value PWL(0 0 1n 1)
SYMBOL filter1 -144 -48 R0
WINDOW 39 -2 89 Center 2
SYMATTR Value Butter_lp_11
SYMATTR InstName F1
SYMATTR SpiceLine Fmeg=1
TEXT -392 -272 Left 2 !.ac dec 100 100k 10meg
TEXT -392 -304 Left 2 !.inc Butterworth1.lib
TEXT -392 -240 Left 2 ;.tran 0 3u 0 1n
TEXT -392 -208 Left 2 !.options plotwinsize=0
TEXT -384 -384 Left 4 ;Butterworth Lowpass 1MHz
TEXT -104 136 Left 2 ;Set Frequencyin MHz
LINE Normal -32 112 -96 48
LINE Normal -96 64 -96 48
LINE Normal -96 48 -96 64 2
LINE Normal -80 48 -96 48