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Which of these is not true for a class B amplifier?
- a)It has zero DC bias
- b)They have an efficiency less than that of class A amplifiers
- c)The quiescent power dissipation is zero
- d)The conduction angle is only 180°
Correct answer is option 'B'. Can you explain this answer?
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Which of these is not true for a class B amplifier?a)It has zero DC bi...
The class B amplifier has zero DC bias as the transistors are biased at cut-off only. Each transistor conducts when the input is greater than the base-emitter voltage. The conduction angle is only 180° for this amplifier. They have higher efficiency than class A amplifiers.
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Which of these is not true for a class B amplifier?a)It has zero DC bi...
C) The quiescent power dissipation is zero.
In class B amplifiers, there is some quiescent power dissipation due to the presence of a small DC bias current. This bias current is necessary to eliminate any crossover distortion that occurs when the input signal crosses the zero threshold. Therefore, the statement that the quiescent power dissipation is zero is not true for a class B amplifier.
In class B amplifiers, there is some quiescent power dissipation due to the presence of a small DC bias current. This bias current is necessary to eliminate any crossover distortion that occurs when the input signal crosses the zero threshold. Therefore, the statement that the quiescent power dissipation is zero is not true for a class B amplifier.
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