designing opamp given Vo and Vi relation- Due in 2 days!

Discussion in 'Homework Help' started by canadaopamper, Jun 8, 2008.

  1. canadaopamper

    Thread Starter New Member

    Jun 8, 2008
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    I have just started learning opamps in an introductory course. I am stuck at a question that asks to draw an opamp circuit such that Vo=2Vi + 3 dVi/dt

    My guess would be to use differentiator circuit. But another type of opamp shud be attached to the input of the differentiator configuration to give the 2Vi.

    Vo=output voltage. Vi=input voltage

    Am i thinking right?
    Thanks.
     
  2. circuitashes

    Active Member

    May 13, 2008
    37
    0
    You could use a circuit with two stages:

    Stage 1: feed V_{i} into the inverting inputs of a differentiator(where the product RC = 3) and an inverting amplifier (with a gain of -2).
    The outputs are -RC(dV_{i}/dt) and -2V_{i}.

    Stage 2: feed the two outputs of stage 1 into the inverting input of an inverting summer. This sums the inputs and inverts them to give:
    V_{o} = 2V_{i} + RC(dV_{i}/dt), where RC=3

    NB: The non-inverting inputs of all three differential amps in both stages must be grounded.
     
  3. circuitashes

    Active Member

    May 13, 2008
    37
    0
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