Which class of amplifier is known for high efficiency but can lead to distortion?

Which class of amplifier is known for high efficiency but can lead to distortion?

• A. Class A
• B. Class B
• C. Class C
• D. Class D

Answer: (B)

Class B amplifiers are known for their high efficiency, typically around 50-78%, which makes them suitable for applications where power efficiency is a concern, such as in portable devices or battery-operated equipment. This efficiency is achieved by conducting on only half of the input signal cycle, which means that one transistor amplifies the positive half of the waveform while another handles the negative half. However, this method of operation comes with drawbacks, particularly in the form of distortion. When transitioning between the active and non-active states, Class B amplifiers can introduce crossover distortion. This occurs at the point where the signal crosses from positive to negative, resulting in a non-linear representation of the waveform. Thus, while they are efficient, the potential for distortion is a critical factor to consider when selecting an amplifier for a specific application. Understanding these characteristics is essential for those in the field, as balancing power amplification with audio fidelity is a common challenge in delivering quality sound.

Class B amplifiers are known for their high efficiency, typically around 50-78%, which makes them suitable for applications where power efficiency is a concern, such as in portable devices or battery-operated equipment. This efficiency is achieved by conducting on only half of the input signal cycle, which means that one transistor amplifies the positive half of the waveform while another handles the negative half.

However, this method of operation comes with drawbacks, particularly in the form of distortion. When transitioning between the active and non-active states, Class B amplifiers can introduce crossover distortion. This occurs at the point where the signal crosses from positive to negative, resulting in a non-linear representation of the waveform. Thus, while they are efficient, the potential for distortion is a critical factor to consider when selecting an amplifier for a specific application.

Understanding these characteristics is essential for those in the field, as balancing power amplification with audio fidelity is a common challenge in delivering quality sound.