Version 4.1
SHEET 1 1600 680
WIRE -208 -32 -240 -32
WIRE -80 -32 -128 -32
WIRE 80 -32 -80 -32
WIRE 224 -32 144 -32
WIRE 336 -32 224 -32
WIRE 416 -32 336 -32
WIRE 224 16 224 -32
WIRE 416 16 416 -32
WIRE -240 32 -240 -32
WIRE -240 144 -240 112
WIRE 112 144 -240 144
WIRE 224 144 224 96
WIRE 224 144 112 144
WIRE 416 144 416 96
WIRE 416 144 224 144
WIRE 112 160 112 144
FLAG 112 160 0
FLAG -80 -32 in
FLAG 336 -32 out
SYMBOL cap 144 -48 R90
WINDOW 0 0 32 VBottom 2
WINDOW 3 32 32 VTop 2
SYMATTR InstName C2
SYMATTR Value 10nF
SYMBOL voltage -240 16 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value ac 1.
SYMBOL res -112 -48 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R_source
SYMATTR Value 50R
SYMBOL res 400 0 R0
SYMATTR InstName R_load
SYMATTR Value 50R
SYMBOL ind 208 0 R0
SYMATTR InstName L1
SYMATTR Value 10µH
SYMATTR SpiceLine Rser=1m
TEXT -160 -552 Left 5 ;High pass filter, LC.
TEXT -312 192 Left 2 !.ac dec 100 100 1E9
TEXT -280 -496 Left 4 ;Instructions
TEXT -280 -456 Left 2 ;click on run\nthen click on cct node "out"\nthe node "out" rolls off at 40dbs /decade.
TEXT -280 -320 Left 2 ;In simple terms this circuit is the "high_pass_RC" filter with the R replaced with an inductor.\nThe roll off has increased from the 20dbs per decade of the RC filter to 40dbs per decade.\nThe dissipation of the resistor has been avoided so this filter can be used with significant levels of power.\nThe downside are that....\n the inductor is liable to radiate EMI and hence cause interference.\nthe inductor is not such a simple cheap generally available component as the resistor.\nIf you reduce the source resistance and increase the load resistance, the circuit response will show a peak \nwhere it starts to roll off, you need to add resistive damping to avoid this.
TEXT -272 -360 Left 4 ;Description