Operational Amplifiers Basics
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Questions and Answers

What is the ideal input impedance of an operational amplifier?

  • 100 ohms
  • ideally infinite (correct)
  • 10 kohm
  • 1 kohm

What is the purpose of an inverting amplifier configuration?

  • To decrease the output impedance to zero
  • To amplify the input signal
  • To invert the input signal (correct)
  • To increase the voltage gain to infinity

What is the voltage gain of a voltage follower amplifier?

  • Greater than 100000
  • Less than 1
  • Ideally infinite
  • Equal to 1 (correct)

What is the typical output resistance of an operational amplifier?

<p>750 ohms (A)</p> Signup and view all the answers

Which operational amplifier configuration is used for integration?

<p>Integrating amplifier (C)</p> Signup and view all the answers

What is the output of the op-amp comparator circuit when V1N is less than VREF?

<p>Low and at the negative supply voltage, -Vee (B)</p> Signup and view all the answers

What happens to the output voltage of the op-amp comparator circuit when V1N is increased to a value greater than VREF?

<p>It rapidly switches HIGH towards the positive supply voltage, +Vee (B)</p> Signup and view all the answers

What is the function of the op-amp comparator circuit?

<p>It acts as a threshold detector (C)</p> Signup and view all the answers

What is the output of the op-amp comparator circuit when V1N is equal to VREF?

<p>It is undefined or at a voltage level between +Vee and -Vee (C)</p> Signup and view all the answers

What is the effect of reducing the input voltage, V1N, to a value less than VREF?

<p>The output voltage switches LOW towards the negative supply voltage, -Vee (D)</p> Signup and view all the answers

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