Controlled power amplifier with input voltage monitoring - adjusts input attenuating section when input voltage is above given threshold

摘要

The amplifier has a controlled input attenuating sections (ED) which is set to a value to an amplifier output level below the max. effective sinusoidal output when the amplifier input voltage is above a given threshold value. Pref., the latter input voltage threshold has a value which, when multiplied with the amplification factor, corresponds to the amplitude of the power amplifier operating voltage. ADVANTAGE - Improved efficiency and low operating voltage. Even when over controlled does not lead to interruption of operation.