PSPICE Help, Differential Amplifier Input Offset

Discussion in 'Homework Help' started by goose12, Oct 28, 2013.

  1. goose12

    Thread Starter New Member

    Apr 8, 2013
    3
    0
    I am trying to find the input offset voltage of a differential amplifier using PSPICE . I know the process for finding it is to ground one input and do a voltage sweep at the other input and the value that forces the output to zero is the answer. My problem is that it does not go to zero, instead it starts at 1.822 and levels off at something slightly higher. I have attached my diagram, the circuit we are modeling and my output graph. Is there something wrong with my circuit or methods? Any help is appreciated

    Thanks,

    Goose
     
  2. LvW

    Active Member

    Jun 13, 2013
    674
    100
    Goose12, did you try a negative input voltage? Normally, the sign of an offset is unknown.
     
    goose12 likes this.
  3. goose12

    Thread Starter New Member

    Apr 8, 2013
    3
    0
    That did it, thank you very much!
     
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