virtual ground

Discussion in 'General Electronics Chat' started by dileepchacko, Aug 7, 2008.

  1. dileepchacko

    Thread Starter Active Member

    May 13, 2008
    102
    1
    Hi All

    What is the exact meaning of the virtual ground of an op-amp, why we are calling as virtual ground. Is the point is directly connected or internally connected.
     
  2. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    The answers to your question can be found here

    http://www.allaboutcircuits.com/vol_3/chpt_8/5.html

    Note in particular the virtual ground only applies to the inverting input of an amplifier, and that it is not directly connected to ground, either internally or externally.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    It is not directly connected, but if you were to measure it with a meter it appears to be ground, hence the name. The op amp does an excellent job of making that point "appear" to be ground, even to instrumentation.
     
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