Version 4
SHEET 1 1152 680
WIRE 96 48 32 48
WIRE 208 48 144 48
WIRE 320 48 256 48
WIRE 32 64 32 48
WIRE 144 64 144 48
WIRE 256 64 256 48
WIRE 96 80 96 48
WIRE 208 80 208 48
WIRE 320 80 320 48
WIRE 96 144 96 128
WIRE 208 144 208 128
WIRE 320 144 320 128
FLAG 32 144 0
FLAG 96 144 0
FLAG 144 144 0
FLAG 208 144 0
FLAG 256 144 0
FLAG 320 144 0
FLAG 368 144 0
FLAG 368 64 Vo
SYMBOL voltage 32 48 R0
WINDOW 3 -143 55 Left 0
WINDOW 123 -98 52 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value ""
SYMATTR Value2 AC 1
SYMATTR InstName Vi
SYMBOL e 144 48 R0
WINDOW 39 43 149 Left 0
WINDOW 0 -9 149 Left 0
SYMATTR SpiceLine Laplace=1/((s/6.283)^2+0.6180*(s/6.283)+1)
SYMATTR InstName E1
SYMATTR Value 1
SYMBOL e 256 48 R0
WINDOW 39 67 188 Left 0
WINDOW 0 15 188 Left 0
SYMATTR SpiceLine Laplace=1/((s/6.283)^2+1.6180*(s/6.283)+1)
SYMATTR InstName E2
SYMATTR Value 1
SYMBOL e 368 48 R0
WINDOW 39 55 238 Left 0
WINDOW 0 13 238 Left 0
SYMATTR SpiceLine Laplace=1/((s/6.283)+1)
SYMATTR InstName E3
SYMATTR Value 1
TEXT -152 352 Left 0 !.ac dec 10000 0.01 100
TEXT 32 -160 Left 0 ;Butterworth Lowpass Filter Using Laplace Statement
TEXT -128 -120 Left 0 ;Equation (4.3), Design with Operational Amplifiers and Integrated Circuits, 3rd ed., S. Franco
TEXT 152 -80 Left 0 ;prepared by Damon A. Miller
TEXT 232 -40 Left 0 ;21 July 2008