Research On Broadband High Efficiency Class F Power Amplifier For 5G Communication

As a key component in communication systems,and their performance is very important for communication systems.Excellent RF power amplifier performance directly determines the communication quality of the entire communication system.In order to obtain very high data transmission rates in today's communication systems,communication operators use very complex non-constant envelope modulation techniques.This puts very strict requirements on the entire communication system.With the popularity of 5G communication,in order to cover more spectrum,the bandwidth requirements of communication have become wider and wider.Therefore,improving the efficiency and working bandwidth of power amplifiers is the focus of power amplifier research.Therefore,in this paper,based on the theoretical research on broadband high-efficiency power amplifiers,two broadband high-efficiency Class F power amplifiers are designed based on the harmonic control method.This paper first introduces the classification of power amplifiers,and then studies the matching methods and performance improvement techniques of power amplifiers,including filtering structure matching technology,envelope tracking technology,outphasing synthesis technology,and simplified real-frequency technology.Then based on the design method of class F power amplifier,a method of co-design of power amplifier and filter structure is proposed.For the method of realizing wideband class F power amplifier,a change factor is introduced to the power amplifier drain voltage to make the fundamental wave of power amplifier harmonious The wave impedance has a large space for impedance change,so that there is greater design freedom for the matching network of the power amplifier,which provides a possibility for the realization of the ultra-wideband power amplifier.Two broadband and high-efficiency Class F power amplifiers are designed based on the filter matching technique and the hybrid continuous method were designed respectively.The first one adopted a new type of ring filter matching structure to control and select the higher harmonics of the power amplifier.In the 1.5-3.4 GHz frequency band,the drain efficiency reaches 62.26%-71.32%,and the saturated output power is greater than 40.21 d Bm.The second is based on the theory of hybrid continuous power amplifiers,so that the harmonic impedance is not limited to harsh conditions of zero or infinity,but allows the impedance to change in a free space near the reactive circle along the edge of the Smith chart.This greatly increases the impedance design space and facilitates the realization of ultra-wideband power amplifiers.Based on this method,a band operating in the 1.3-3.9 GHz(three octave)band is designed to achieve a saturation efficiency between 61.2%-70.8%,a gain greater than 10.2 d B,and a saturated output power better than 40.5 d Bm.In this paper,a class F power amplifier is studied,the main design methods of the class F power amplifier are analyzed,and a new type of harmonic matching method is proposed.At the same time,some problems faced by the class F power amplifier are also proposed in the forecast.I hope to provide some valuable references for the development of future power amplifiers and their application in communication equipment.