Class B Amplifier
A Class B amplifier is an electronic amplifier configuration where each active device (typically a transistor) conducts for exactly half of the input signal cycle, with one device handling the positive half and another handling the negative half. This design eliminates the quiescent (idle) current found in Class A amplifiers, significantly improving efficiency, but it introduces crossover distortion at the zero-crossing point where the devices switch. It is commonly used in audio power amplification and radio frequency applications where efficiency is prioritized over linearity.
Developers should learn about Class B amplifiers when working on audio systems, RF circuits, or power electronics where high efficiency (theoretically up to 78.5%) is critical, such as in battery-powered devices or high-power transmitters. It is particularly useful in push-pull amplifier designs to reduce heat dissipation and power consumption, though it requires careful design to mitigate crossover distortion, often by combining it with Class AB configurations for better performance in audio applications.