| Summary: | In order to meet the surging demand of mobile data traffic in the future, 5G communication system will adopt a more complex non-constant envelope modulation method, resulting in high peak-to-average power ratio(PAPR) of the transmitted signal, thus putting forward more stringent requirements on the performance of millimeter-wave radio frequency power amplifier(RFPA). The CMOS process combines the advantages of low cost and high integration, making it ideal for fully integrating 5G RF modules. This paper introduces and compares various techniques for improving the efficiency and linearity of power amplifiers(PAs), mainly expounds the research status of envelope tracking(ET) technology, and finally analyzes the development trend of power amplifiers in 5G applications.
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