Design Of Class-E Power Amplifier For Multi-mode Multi-standard Transceiver Based On BiCMOS Technology

With the development of communication technology in modern society,new communication standards have been proposed.A good communication device can not only meet the requirements of various communication standards,but also has strong battery life,especially portable communication devices,which raise higher requirements for the power amplifier in the transmitter.Therefore,it is significant to study the high efficiency power amplifier which can meet various communication standards.The theoretical part of this paper describes the design difficulties and challenges of the power amplifier,According to the multi standard requirements,this paper introduces the common technology of the broadband power amplifier design,considering the requirements of high efficiency,the basic structure and working principle of the switching power amplifier class D,class E and class F are discussed.E class structure is applied to the design of this power amplifier.Load transformation network design directly affects the performance of the broadband class E power amplifier,so the theory also focuses on the analysis of the Load transformation network of broadband E power amplifier.A broadband E class power amplifier is designed with the differential inductance load network at last.The amplifier adopts 0.13?m SiGe BiCMOS technology,covering the most communication standards within 1.7G-2.7G and meets the varieties of communication standards of communication equipment.On the other hand,in class-E power amplifier works in switch state,Class-E amplifier has high efficiency when compared with the traditional linear power amplifier,which achieve low power consumption of wearable communication equipment requirements.The power amplifier is consisted of differential topology,which can not only improve the bandwidth of power amplifier.by suppressing even harmonic in the output but also decrease parasitic effects of integrated circuit.Considering the influence of breakdown voltage,the driver level of power amplifier adopts cascode structure.The load transformation network of the power amplifier adopts a novel parallel-circuit load structure,which not only simplifies the circuit but also increases the bandwidth and efficiency of the amplifier.The design also uses lossy matching,matching compensation technology to enhance the overall performance of the amplifier.The post-simulation results show that the power amplifier is unconditionally stable in the working band of 1.7G-2.7G,the input reflection coefficient S11 is less than-11.0dB,which means the input matching net works well.Output power is greater than 27.6dBm,power-added efficiency is above 51.7%,and power gain is higher than 22.6dB,which meets the needs of a variety of applications.The design of the power amplifier mainly consider multi-mode multi standard and high efficiency,the mostly important target application is low power portable communication equipment.Of course,in the scenario of high linearity,the envelope elimination and restoration structure can be applied to improve the overall linearity of power amplifier to meet the requirements.