virtual ground

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

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  1. Aug 7, 2008 #1
    dileepchacko

    Thread Starter Active Member

    May 13, 2008
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    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.
     
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  2. Aug 7, 2008 #2
    studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    523
    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.
     
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  3. Aug 7, 2008 #3
    Wendy

    Moderator

    Mar 24, 2008
    21,352
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    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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