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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°I had been asked this question in an interview for internship.Query is from Push-Pull Class B Amplifier topic in section Power Amplifier of Analog Circuits

Answer»

Right OPTION is (b) They have an efficiency LESS than that of class A amplifiers

To explain I would SAY: 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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