PA is short for Power Amplifier, the Chinese name is called power amplifier, referred to as \"power amplifier\
For RF communication systems, PA is responsible for signal amplification of the transmission channel, without PA, signal coverage will become a big problem, so PA is very important.
The main technical index of RF PA is output power and efficiency, how to improve the output power and efficiency is the core of the design goal of RF power amplifier. As an RF chip, PA not only has a demand for the process, but also the technical ability, experience accumulation and patent support of its design team are very important, especially the experience of engineers and Know-How, is the most important. Moreover, with the arrival of 5G, PA needs to meet a large number of performance parameters, so it inevitably needs the accumulation of research and development time, which has certain obstacles for later entrants. Especially in terms of process, it is a threshold that many PA manufacturers, even RF manufacturers, are difficult to overcome.