Diff amp with widlar current source

Discussion in 'Homework Help' started by laguna92651, Mar 22, 2010.

  1. laguna92651

    Thread Starter Active Member

    Mar 29, 2008
    101
    0
    I designed the attached diff amp. Can't seem to get it to work in pspice. Am I using the correct source for the input? I also noticed the diff amp is loading down the current source from 5mA(designed value) to 2 mA when connected to the diff amp. I used Ad=gmRc/2 to calculate IR4 of 5mA.

    The circuit requirements are:
    20<=Ad<=30
    Rid>=20kΩ
    bias current = 5mA
    Must use ±10v

    Second question, how do I calculate max peak-to-peak output swing, and the max input voltage that can be applied without any distortion?
    Thank you
     
  2. laguna92651

    Thread Starter Active Member

    Mar 29, 2008
    101
    0
    I see what I did wrong, I set up the input signal incorrectly.

    In regards to the second question, how do I calculate max peak-to-peak output swing, and the max input voltage that can be applied without any distortion?
     
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