CREST FACTOR REDUCTION APPLIED TO SHAPING TABLE TO INCREASE POWER AMPLIFIER EFFICIENCY OF ENVELOPE TRACKING AMPLIFIER

摘要

There is disclosed a method of controlling an input to an envelope modulated power supply of an envelope tracking amplification stage, comprising: generating an envelope signal representing the envelope of a signal to be amplified; applying a shaping function to the envelope signal to generate a shaped envelope signal, including: clipping the shaped envelope signal at high input envelope values; and providing the shaped envelope signal as an input signal to the envelope modulated power supply.