SKY66319-11 High-Efficiency Power Amplifier Skyworks Solutions Inc. SKY66319-11 High-Efficiency Power Amplifier offers wide instantaneous bandwidth in a fully input/output matched power amplifier (PA) with high gain and linearity. The SKY66319-11 High-Efficiency Power Amplifier is designed for 5G and TDD 4G LTE systems operating from 4400MHz to 5000MHz. The active biasing circuitry is integrated to compensate for PA performance over temperature, voltage, and process variation.