class AB amplifier
- An intermediate between class A and class B amplifiers. Both output devices are on more than 50% of each half cycle of the input, but never all the time. This increases efficiency compared to class A, and allows for faster response to the input when compared to class B. The good efficiency and low distortion make it a popular choice for audio high-fidelity systems. Another use, among others, is in asymmetrical digital subscriber lines.