CLASS B PUSH PULL AMPLIFIER
The circuitry for the Class B Push-Pull amplifier operation is the same as that for the Class A operation except that the device are biased at cutoff.
It is possible to obtain greater power output. Class B power amplifier provides practically 4 times the power supplied by a single ended amplifier provided load resistance remains the same
It gives higher operating efficiency (theoretically 78.5%). It is primarily due to the fact that no power is drawn by the circuit under Zero signal condition.
Because of above advantages, a push-pull class B transistor circuit is preferred in systems Where the power supply is limited, such as those operating from solar cells or battery. The automatic cancellation of all even order harmonics from the output makes class B push-pull amplifiers highly desirable communication sound equipment.
- The Harmonic distortion is Higher.
- Self Bias cannot be used
- Supply Voltage must have good regulation