We rely heavily on mobile devices for a wide range of our needs, from serving as our primary method of communication to being a flashlight or alarm clock. The last thing any user wants is a dead battery. To extend battery life and improve efficiency, designers are focused on the power efficiency of the radio, particularly for modern communication standards such as LTE and 802.11ac. The transmitter's final-stage power amplifier (PA) often consumes the most power. This, combined with the increasing complexity of modern communications signals, requires engineers to make difficult tradeoffs between efficiency and linearity, and has led to the introduction of a wide range of new PA design and test techniques.
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