Power amplifier with improved power consumption

摘要

The amplifier shall at least include:1. First push-pull amplifier ("21");1. Second push-pull amplifier ("22");1. The first 90 ° hybrid coupler (23), coupled to the input (21,22) and the second 90 ° hybrid coupler (24) of the amplifier, coupled to the output (21,22) of the amplifier, and the amplifier is balanced by the coupler (23,24);The control device of the second push-pull amplifierWhen the power of the input signal ("rfin") of the power amplifier is less than the first threshold, the second amplifier (("22") is turned off.The power of the second amplifier (22) is linearly controlled according to the power of the input signal, which is between the first threshold and the second threshold.When the power of the input '' signal exceeds the second threshold, the push-pull amplifier (21, 22) controls at the same power.Abbreviations: Figure 2