Research On Self-Powered LDMOS Power Amplifier In RF Transceiver Components

With the rapid development of the Internet of Things,wireless sensor networks related to the Internet of Things are also rapidly developing,and reports of self-powered sensors and energy harvesting technologies have appeared one after another.At present,RF transceivers in the Internet of Things are facing major technical issues such as power supply and heat dissipation.The research find that about 70%of the power of the transmitter module in the IoT RF transceiver assembly is dissipated into the environment in the form of heat energy.The most commonly used power supply technology is the lithium battery technology that is inconvenient to replace and has limited capacity.In this paper,starting from the large heat loss of RF amplifiers in the Internet of Things,combined with the limited capacity of traditional batteries and inconvenient replacement,a monolithically integrated thermoelectric photoelectric energy harvester is designed to collect light energy in the environment and wasted heat energy generated by power amplifiers.The obtained green power can use the energy management circuit to achieve a stable output,which is used to power wireless sensor networks and other low-power modules.Based on the above background,this article proposes a self-powered LDMOS power amplifier in the RF transceiver of the Internet of Things,and this article is mainly divided into two parts.The first part is about the research of power amplifier and LDMOS.The power amplifier is mainly based on the design requirements,simulation design and optimization analysis under ADS software.Finally,after simulation and optimization,when the input power is 23dBm,the output power of 2dB compression point is 40.5dBm,power added efficiency PAE is 51%,power gain is above 17dB.The LDMOS device with thermoelectric conversion function is to prepare thermocouples in traditional devices.The temperature difference of 20K can be achieved by simulation and the power output of microwatts can be achieved based on theoretical calculations.The second part deals with the research of thermoelectric-optoelectronic monolithic integrated energy collectors.The thermoelectric part is mainly based on the basic theory and the establishment of thermal and electrical equivalent models.Using the ANSYS software,simulation optimization design and results analysis demonstration can be gained,and the final simulation results show that the output voltage is 0.48 V and the current density is 6.63 A/mm~2.The photovoltaic cell part was designed and optimized with the help of TCAD simulation software.The final simulation results show that the short-circuit current density of the photocell is 41.31 mA/cm~2,and the open circuit voltage is 0.73V.The innovation of this article is to start with the heat loss problem of the radio frequency transceiver components in the Internet of Things.Combining the technical characteristics of MEMS,this paper proposes a LDMOS power amplifier with thermoelectric conversion function and a monolithically integrated thermoelectric photoelectric energy collector.