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In a common-emitter BJT configuration, what is the phase relationship between in

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Question: In a common-emitter BJT configuration, what is the phase relationship between input and output signals?

Options:

  1. In phase
  2. Out of phase
  3. No relationship
  4. Depends on frequency

Correct Answer: Out of phase

Solution: 

In a common-emitter BJT configuration, the output signal is out of phase with the input signal, meaning a positive input results in a negative output.

In a common-emitter BJT configuration, what is the phase relationship between in

Practice Questions

Q1
In a common-emitter BJT configuration, what is the phase relationship between input and output signals?
  1. In phase
  2. Out of phase
  3. No relationship
  4. Depends on frequency

Questions & Step-by-Step Solutions

In a common-emitter BJT configuration, what is the phase relationship between input and output signals?
  • Step 1: Understand that a common-emitter BJT configuration is a type of amplifier circuit.
  • Step 2: Identify the input signal, which is applied to the base of the BJT.
  • Step 3: Identify the output signal, which is taken from the collector of the BJT.
  • Step 4: Recognize that in this configuration, when the input signal increases (goes positive), the output signal decreases (goes negative).
  • Step 5: Conclude that the output signal is out of phase with the input signal, meaning they move in opposite directions.
  • Phase Relationship in Common-Emitter Configuration – In a common-emitter BJT configuration, the output signal is inverted relative to the input signal, indicating a phase shift of 180 degrees.
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