RLC parallel filter question.

Discussion in 'General Electronics Chat' started by Virium, Apr 13, 2016.

  1. Virium

    Thread Starter New Member

    Jan 8, 2016
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    Hello everybody, trying to simulate RLC filters in multisim, and I am stuck on this particular one. There is no voltage difference between input and output, no matter the frequency. I have also added small resistances in series with the capacitor/inductor. Any hints to what I am doing wrong ?
    rlc.png
     
  2. Veracohr

    Well-Known Member

    Jan 3, 2011
    549
    75
    Put some resistance before the LC.
     
  3. crutschow

    Expert

    Mar 14, 2008
    12,976
    3,220
    Show the simulation schematic with parts values and results.
     
  4. Marley

    Member

    Apr 4, 2016
    142
    40
    Of course in real life the source would have some impedance. So the voltage across RL would change with frequency. But impossible to simulate without knowing the source impedance.
     
  5. Virium

    Thread Starter New Member

    Jan 8, 2016
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    0
  6. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,957
    1,097
    But how can you be able to see any difference between the input and output if you driving this circuit form a ideal voltage source?
    LC tank circuit and the load resistance is directly connected to the voltage source. Vin is the same voltage as Vout = Vin.
    Try use a current source instead of a voltage source or put LC tank in series with the load resistance.
     
  7. Papabravo

    Expert

    Feb 24, 2006
    10,135
    1,786
    How can there be any difference because they are the same nodes in your network. What happens if the impedance of your voltage source is (equal to, very much less than, very much greater than) the load resistance.
     
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