op-amp

Discussion in 'General Electronics Chat' started by Yeahia, Oct 15, 2012.

  1. Yeahia

    Thread Starter New Member

    Oct 15, 2012
    3
    0
    why input offset voltage exist in all op-amp?
    only i know it due to mismatch of input offset current. please ans and explain
     
  2. Audioguru

    Expert

    Dec 20, 2007
    10,584
    1,178
    They cannot make the input transistors in an opamp exactly the same. The small difference causes an input offset voltage and current.
    Some opamps have the input offset voltage and current almost eliminated by laser trimming of the emitter resistors.
     
  3. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    510
    The only way there would be no offset at all would be if the transistors were matched to perfection. Nothing made by man ever achieves perfection.....
     
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