In which type of power amplifier does the output current flow for the entire cycle of input signal?

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ALP CBT 2 Electrician Official Paper (Held On: 23 Jan 2019 Shift 3)
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  1. Class C
  2. Class AB
  3. Class B
  4. Class A

Answer (Detailed Solution Below)

Option 4 : Class A
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Detailed Solution

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  • The transistor amplifier in which collector current flows for the entire cycle of input AC signal is called class A amplifier.
  • The transistor amplifier in which collector current flows for the half-cycle of an AC signal is called a class B amplifier.
  • The transistor amplifier in which collector current flows for less than half the cycle of an AC signal is called a class C amplifier
  •  

    Power Amplifier

    Conduction Angle

    Maximum Efficiency

    Figure of Merit

    Class A

    360°

    50%

    2

    Class B

    180°

    78.5%

    0.4

    Class AB

    180° - 360°

    50 – 78.5%

    0.4 – 2

    Class C

    < 180°

    ≥ 90°

    < 0.25

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