The Differential Amplifier Quiz
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Questions and Answers

What is the name of the operational amplifier circuit configuration shown above?

  • Differential Amplifier (correct)
  • Non-Inverting Amplifier
  • Summing Amplifier
  • Inverting Amplifier

    • What is the condition for the differential amplifier circuit to become a Unity Gain Differential Amplifier?

  • R1 ≠ R2 and R3 = R4
  • R1 = R2 = R3 = R4 (correct)
  • R1 = R2 and R3 ≠ R4
  • R1 = R2 and R3 = R4

    • What is the purpose of adding more resistors in parallel with the input resistors R1 and R3?

  • To increase the voltage gain of the amplifier
  • To decrease the voltage gain of the amplifier
  • To allow the circuit to either 'Add' or 'Subtract' the input voltages (correct)
  • To reduce the noise in the circuit

    • What happens to the output voltage sum when input V1 is higher than input V2?

    <p>It becomes negative</p> Signup and view all the answers

    What is the name of the resistive network commonly used with the differential amplifier circuit?

    <p>Wheatstone Bridge</p> Signup and view all the answers

    What is the function of the circuit in the 'Light Activated Differential Amplifier'?

    <p>To detect changes in light levels</p> Signup and view all the answers

    What is the expression for the output voltage Vout when all the resistors are of the same ohmic value?

    <p>Vout = V2 - V1</p> Signup and view all the answers

    What is the purpose of using a differential amplifier circuit?

    <p>To compare two input voltages</p> Signup and view all the answers

    What is the main function of a differential amplifier?

    <p>To produce an output voltage proportional to the difference of two input signals</p> Signup and view all the answers

    Why can an operational amplifier be called a differential amplifier?

    <p>Because it has two input terminals</p> Signup and view all the answers

    What is the primary difference between a differential amplifier and a summing amplifier?

    <p>The way they process input voltage signals</p> Signup and view all the answers

    What happens when signals are connected to both input terminals of an operational amplifier?

    <p>The output voltage is proportional to the difference of the input signals</p> Signup and view all the answers

    What is the purpose of using a differential amplifier?

    <p>To subtract one input voltage signal from another</p> Signup and view all the answers

    How many input signals can be connected to a standard operational amplifier?

    <p>Two</p> Signup and view all the answers

    What type of circuit is a differential amplifier?

    <p>A voltage subtractor circuit</p> Signup and view all the answers

    What is the output voltage of a differential amplifier proportional to?

    <p>The difference of the input voltage signals</p> Signup and view all the answers

    Study Notes

    The Differential Amplifier

    • Amplifies the voltage difference between the inverting and non-inverting inputs
    • A voltage subtractor circuit that produces an output voltage proportional to the voltage difference of two input signals
    • Can be used to amplify a single input signal with the other input connected to ground

    Operation

    • Can connect signals to both inverting and non-inverting inputs at the same time
    • Output voltage is proportional to the difference between the two input voltage signals (V1 and V2)
    • Acts as a Subtractor, unlike a summing amplifier which adds or sums together the input voltages

    Differential Amplifier Circuit

    Transfer Function

    • Given as: Vout = (R3/R1)(V2 - V1) + (R4/R2)(V2 - V1)
    • Can be simplified to: Vout = (R/R)(V2 - V1) when R1 = R2 and R3 = R4
    • Becomes a Unity Gain Differential Amplifier when R1 = R2 = R3 = R4, with a voltage gain of exactly one or unity
      • Output expression: Vout = V2 – V1
      • Output voltage sum is negative if V1 > V2, and positive if V2 > V1

    Applications

    • Can be made to "Add" or "Subtract" voltages applied to their respective inputs by adding more resistors in parallel with the input resistors R1 and R3
    • Can be used with a "Resistive Bridge" (Wheatstone Bridge) to create a differential voltage comparator
    • Can be used with sensors like thermistors or light-dependent resistors to detect changes in temperature or light ![Wheatstone Bridge Differential Amplifier](https://example.com/wheatstone_bridge_circuit.png) ![Light Activated Differential Amplifier](https://example.com/light_activated_op_amp_circuit.png)

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    Description

    This quiz covers the concepts of differential amplifiers, voltage subtraction and output voltage in electronics. Test your knowledge on the differential amplifier circuit and its applications.

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