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Homework Help: Linear Inverting Amplifier Help

  1. Sep 14, 2014 #1
    1. The problem statement, all variables and given/known data
    A linear inverting amplifier has these characteristics:
    -5.0V < vo < +5.0V Av=35 dB
    The output rails at -5.0V and +5.0V That is, the amplifier outputs no voltage larger in magnitude than 5.0V.

    What is the gain in V/V?
    What is the output if vi=-8.0V?

    2. Relevant equations
    Av = vo/vi
    Av = 20log|Av|

    3. The attempt at a solution
    Av = 35db
    35/20 =log|Av| => Av = e^(7/4) V/V
    vo = Av * vi => (-8.0V) * e^(7/4)
    but since this is out of the -5V to 5V range, it would just be 5V

    Does this look right?
  2. jcsd
  3. Sep 14, 2014 #2


    User Avatar

    Staff: Mentor

    Watch it! The log is base 10, not base e. And you should be able to write a numerical value for a result.

    Yup. The input already exceeds the output range and the gain is greater than unity.
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