The biasing of the transistor in class B operation is in such a way that at zero signal condition, there will be no collector current.
The operating point is selected to be at collector cut off voltage.
So, when the signal is applied, only the positive half cycle is amplified at the output.
What is the class B amplifier?
Class B amplifier is a type of power amplifier where the active device (transistor) conducts only for one half cycle of the input signal. That means the conduction angle is 180° for a Class B amplifier. Anyway, Class C amplifiers are more often used in RF power amplifier applications.9 Jan 2014
What are Class B amplifiers used for?
Crossover distortion is more of a problem in low and medium power class B amplifiers and the method used to eliminate it, is to use a class B amplifier that has some bias (and quiescent current) added so that the output transistors are conducting continually, and so avoiding the ‘dead zone’ of class B. As this method
What is the difference between Class A and Class B amplifier?
Class A Amplifier. The main role of class-A bias is to keep amplifier free from distortion by keeping signal waveform out of the non-linear region which exists between 0V and 0.6V. The figure-1 depicts class A amplifier bias characteristics. Class A is used for low to medium power output stages.
What is class AB?
Definition. Class AB amplifiers combine Class A and Class B to achieve an amplifier with more efficiency than Class A but with lower distortion than class B.
How does a class B amplifier work?
Class B Amplifier operation has zero DC bias as the transistors are biased at the cut-off, so each transistor only conducts when the input signal is greater than the Base-emitter voltage. This then means that the actual Q-point of a Class B amplifier is on the Vce part of the load line as shown below.
What is crossover distortion in Class B amplifier?
Crossover distortion is the term given to a type of distortion that occurs in push-pull class AB or class B amplifiers. It happens during the time that one side of the output stage shuts off, and the other turns on.