Poles and zeros

Discussion in 'Homework Help' started by MilK, Apr 7, 2010.

  1. MilK

    Thread Starter Member

    Mar 1, 2008
    25
    0
    Hi,

    For RLC / RC / RL circuit, with soure and load R, Can i determine the number of zeros just by inspection? as in by looking at the circuit, without finding the transfer function. I just need to know how many zeros there are, not the exact value.

    I know i can find how many poles by looking at the number of Cap & Inductors, but zeros?

    Thx in adv:D
     
  2. Ghar

    Active Member

    Mar 8, 2010
    655
    72
    Zeroes are much trickier to spot and depend on your input / output definition while the poles are the same for any transfer function in that circuit.

    I don't think there's any simple way to do it except by learning to recognize certain situations that give you a zero.
     
  3. MilK

    Thread Starter Member

    Mar 1, 2008
    25
    0
    what kind of situation?
     
  4. Ghar

    Active Member

    Mar 8, 2010
    655
    72
    The most basic one is that a series RC with the output defined across the resistor gives you a zero at f = 0
     
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