Differential amplifier

Discussion in 'General Electronics Chat' started by logearav, Dec 21, 2012.

  1. logearav

    Thread Starter Member

    Aug 19, 2011
    248
    0
    Revered members,
    Please go through my attachment. While calculating the output of Non inverting terminal, V+ is explicitly calculated. But when arriving at the expression for the output of Inverting terminal why not V- is not calculated? It is simply mentioned as V2. Members, could you elaborate?
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,534
    This is not a physics question, so I am moving it to the appropriate forum.
     
    logearav likes this.
  3. Brownout

    Well-Known Member

    Jan 10, 2012
    2,375
    998
    Because in the calculation of Vo2, v- is a virtual ground or 0V. The expression for Vo2 can be calculated by summing the currents at v-. They just skipped this step. Once you do the calculation once, you just use the result in subsequent analysis.
     
    logearav likes this.
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