ENGINEERING ELECTRONIC CIRCUITS and DEVICES. Инженерные электронные схемы и устройства

Class A amplifiers operate without signal clipping on the most linear portion of the current-voltage characteristic of the amplifying elements. This ensures a minimum of non-linear distortion (THD and IMD), both at rated power and at low power.

Усилители класса А работают без отсечения сигнала на самой линейной части вольт-амперной характеристики усилительных элементов. Это обеспечивает минимум нелинейных искажений (THD и IMD), как при номинальной мощности, так и при низкой мощности.

For this minimum you have to pay with impressive power consumption, size and weight. On average, the efficiency of a Class A amplifier is 15-30%, and the power consumption does not depend on the value of the output power. The power dissipation is maximum at small output signals.

2019