Version 4.1
SHEET 1 2152 756
WIRE -480 64 -544 64
WIRE 160 64 -32 64
WIRE 256 64 160 64
WIRE 448 64 336 64
WIRE 464 64 448 64
WIRE 544 64 464 64
WIRE 544 80 544 64
WIRE -32 96 -32 64
WIRE -544 128 -544 64
WIRE 464 144 464 64
WIRE 544 208 544 160
WIRE -544 256 -544 208
WIRE -32 256 -32 176
WIRE -544 336 -544 304
WIRE 464 336 464 208
WIRE 464 336 400 336
WIRE 544 336 544 272
WIRE 544 336 464 336
WIRE 400 352 400 336
WIRE -544 448 -544 416
WIRE -432 512 -432 480
WIRE -432 624 -432 592
FLAG -544 256 0
FLAG 400 352 0
FLAG 160 64 Increasing_freq
FLAG 448 64 Vout
FLAG -432 624 0
FLAG -544 448 0
FLAG -432 480 t
FLAG -544 304 w
FLAG -32 256 0
FLAG -480 64 sine
SYMBOL cap 480 144 M0
SYMATTR InstName C1
SYMATTR Value 1µ
SYMBOL bv -544 112 R0
SYMATTR InstName B1
SYMATTR Value V=sin(100*2*pi*V(w)*V(t))
SYMBOL voltage -544 320 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value PULSE(1 1000 10u 500u 1 1 10)
SYMBOL voltage -432 496 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value PULSE(0 1 0 1 1 1 10)
SYMBOL ind 352 48 R90
WINDOW 0 5 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName L1
SYMATTR Value 10µH
SYMATTR SpiceLine Rser=1m
SYMBOL bv -32 80 R0
WINDOW 3 -137 106 Left 2
SYMATTR Value V=limit(0, 10, 1E5*V(sine) )
SYMATTR InstName B2
SYMBOL res 528 64 R0
SYMATTR InstName R1
SYMATTR Value 3R
SYMBOL cap 528 208 R0
SYMATTR InstName C2
SYMATTR Value 3µ
TEXT 0 296 Left 2 !.tran 0 500u 0 10n
TEXT 664 104 Left 2 ;click on run\nclick on "Increasing_freq" to plot its voltage\nclick on "Vout" to plot its voltage
TEXT 656 56 Left 4 ;Instructions
TEXT -224 -120 Left 5 ;LC circuit, variable frequency.
TEXT 640 304 Left 4 ;Circuit description
TEXT 664 360 Left 2 ;as the frequency of the input voltage increases\nthe output amplitude decreases.\nso this is a low pass filter.\nthis circuit topology is typically used as the\noutput filter for an SMPS.
TEXT -400 32 Left 2 ;this cct block creates an\nincreasing freq sq. wave\nyou don't have to \nunderstand this cct block
RECTANGLE Normal 32 672 -592 0 2