Classes of Bipolar Junction Transistor


Classes of Bipolar Junction Transistor

  1. Class-A: Transistor operate in active region at all times i.e. collector current flows for 360º of the ac cycle.
    • The maximum efficiency of class A amplifier is 25%.
    • It has very less distortion.
    • Used in low power amplifier.
  2. Class-B: Collector current flows for only half the cycle 180º. This is why transistor transistor Q-Point lies at cut off.
    • The maximum efficiency of class B amplifier is 78.5% with Push-Pull arrangement.
    • It has small to moderate distortion.
    • Used as power amplifier.
    • Uses push-pull effect and complementary output transistors.
  3. Class-C: In this operation Collector current flows for less than 180º of the ac cycle.
    • The maximum efficiency of class C amplifier is near to 100%.
    • It has large distortion.
    • Used in Tuned RF Power amplifier and final amplifier stages in communication circuits.

Reference:

Albert Malvino and David J Bates, “Electronic Principles”, 7th Edition, TATA McGRAW HILL.

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