Common mode voltage

Discussion in 'General Electronics Chat' started by Coz, May 13, 2005.

  1. Coz

    Thread Starter New Member

    Nov 5, 2004
    3
    0
    I am working on an op amp project and was wondering if someone could explain common mode voltage, in the context of op amps and in general. From what I have read it is voltage that is common to both inputs of the op amp and is not desirable.

    Thanks
     
  2. David Bridgen

    Senior Member

    Feb 10, 2005
    278
    0
    Yes, exactly.
    If you have a signal which appears simultaneously at both inputs it is called a common-mode signal and will not be amplified.
    One of an op-amp's properties is called its common-mode rejection ratio.
    You can read about it in more or less any op-amp tutorial.
     
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