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Characteristics of Operational-Amplifiers

Characteristics of Operational-Amplifiers

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Learn about Ideal, Inverting, Noninverting, Summing, and Difference amps' properties in a circuit.

Items (16)

  • Ideal Op-Amp: Vinput

    V+input = V-input

  • Ideal Op-Amp: Iinput

    I+input = 0, I-input = 0

  • Inverting Op-Amp: Voutput

    -(Rfeedback / R-source)*V-source

  • Op-Amp: Voutput

    Voutput = A(V+input - V-input)

  • Op-Amp: A

    A = gain

  • Inverting Op-Amp: Purpose

    Reverses polarity of the input signal while amplifying it.

  • Inverting Op-Amp: Gain

    Voutput/V-source = Rfeedback/R-source

  • Noninverting Op-Amp: Voutput when Rfeedback = 0, R-input = ∞

    Voutput = V+source

  • Noninverting Op-Amp: Gain

    Voutput/V+source = Rfeedback/R-source

  • Noninverting Op-Amp: Purpose

    Use as buffer to isolate one circuit from another (due to high input impedance).

  • Summing Op-Amp: Purpose

    Voutput = weighted sum of V-sources

  • Summing Op-Amp: Voutput

    Voutput = -(∑(Rfeedback/R-sources)*V-sources)

  • Difference Op-Amp: Purpose

    Amplifies difference between two inputs, but rejects any signals common to the two inputs.

  • Difference Op-Amp: Voutput

    Voutput = V-input*(1 + (Rfeedback/R-source)) - (Rfeedback/R-source)*V-source

  • Difference Op-Amp: Voutput when R-source/Rfeedback = R+source/R||V+source

    Voutput = (Rfeedback/R-source)*(V+source - V-source)

  • Difference Op-Amp: Voutput when R-source = Rfeedback, R+source = R||V+source

    Voutput = V+source - V-source