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Amplifier Frequency Response MCQs

Practice Amplifier Frequency Response MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1
Electronic Devices & CircuitsAmplifier Frequency Response

A cascode amplifier is commonly used because it can provide high gain while reducing the influence of which high-frequency effect associated with input-output capacitance?

  • AMiller effect
  • BHall effect
  • CZener effect
  • DPhotoelectric effect
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Correct Answer: A. Miller effect
Explanation: The cascode keeps the voltage variation across the input transistor's feedback capacitance relatively small, reducing Miller multiplication and improving high-frequency response.
Reference: Standard analog electronics: cascode and Miller effect
Question 2
Electronic Devices & CircuitsAmplifier Frequency Response

For a BJT amplifier, the Miller effect can make a feedback capacitance between collector and base appear at the input as?

  • AA larger effective capacitance
  • BExactly zero capacitance
  • CA pure inductance
  • DA negative resistance only
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Correct Answer: A. A larger effective capacitance
Explanation: Voltage gain across a feedback capacitance can multiply its apparent input effect, increasing effective input capacitance and reducing high-frequency bandwidth.
Reference: Standard analog electronics: Miller effect
Question 3
Electronic Devices & CircuitsAmplifier Frequency Response

The dominant low-frequency cutoff of a capacitively coupled transistor amplifier is commonly influenced by?

  • ACoupling and bypass capacitors with the resistances they see
  • BTransistor transit time only
  • CJunction breakdown voltage only
  • DCollector power rating only
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Correct Answer: A. Coupling and bypass capacitors with the resistances they see
Explanation: At low frequencies, coupling and emitter/source bypass capacitors have larger reactance, creating high-pass poles that determine the low-frequency response.
Reference: Standard analog electronics: low-frequency response