Imput impedance

Discussion in 'Homework Help' started by omar-rodriguez, Feb 13, 2016.

  1. omar-rodriguez

    Thread Starter Member

    Jun 24, 2015
    51
    2
    Hello,I have a very basic question ¿What's the imput impedance on this circuit?

    [​IMG]
    I'm not sure if it is Zin=Vsignal/i or Zin=Va/i ?
     
    Last edited: Feb 13, 2016
  2. WBahn

    Moderator

    Mar 31, 2012
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    Why do you think it might be Va/i?
     
  3. omar-rodriguez

    Thread Starter Member

    Jun 24, 2015
    51
    2
    because I believed that with imput, they are talking about all the input branch
     
    Last edited: Feb 13, 2016
  4. WBahn

    Moderator

    Mar 31, 2012
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    First, the word is "input", not "imput".

    What is are the input terminals for this circuit?
     
  5. omar-rodriguez

    Thread Starter Member

    Jun 24, 2015
    51
    2
    I'm sorry I don't speak English I'm just trying... now I understand your point it is Zin=Vsignal/i, because Vsignal is the input
     
  6. WBahn

    Moderator

    Mar 31, 2012
    17,777
    4,804
    Don't worry -- you're English is far better then my (fill-in-your-native-tongue-here).

    Correct. Vsignal is the input voltage and i is the input current. The ratio between them is therefore the input impedance.

    Though there are really two input impedances -- large signal and small signal; but I don't know if you have gotten to that yet.
     
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