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

    New Member

    Dec 20, 2007
    9,411
    896
    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
    507
    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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