High input impedance.

Discussion in 'Homework Help' started by Maintenance Man, Apr 21, 2011.

  1. Maintenance Man

    Thread Starter New Member

    May 12, 2010
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    We are studying amplifiers in electronics class, and I am having trouble understanding why a good amplifier has high impedance at the input. Is it to cause low current flow at the input while keeping the voltage at a constant? If someone could give me an easy explanation, I would greatly appreciate it. Thank you very much. :confused:
     
  2. guitarguy12387

    Active Member

    Apr 10, 2008
    359
    12
    It is to prevent "loading effect" from previous stages. Otherwise, if the input impedance is smaller, you will get sort of a voltage divider effect. You will lose gain.
     
    Last edited: Apr 22, 2011
  3. Ron H

    AAC Fanatic!

    Apr 14, 2005
    7,050
    656
    Substitute "previous" or "preceding" for "subsequent".
     
  4. guitarguy12387

    Active Member

    Apr 10, 2008
    359
    12
    Haha yeah, sorry about that! Fixed
     
  5. Maintenance Man

    Thread Starter New Member

    May 12, 2010
    25
    0
    Thank you all for your help:)
     
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