Design and Simulation of a 20-Watt Doherty Power Amplifier at a frequency of 2.14 GHz for wireless communication systems

In this study, a symmetrical doherty power amplifier was designed and simulated at a frequency of 2.14 GHz with high power added efficiency and output power of 20-watts. Doherty Power Amplifier generally consist of two separate power amplifiers. The main power amplifier enhancer is designed and developed in the AB class. Auxiliary power amplifier is designed in class C. To divide the power between the two amplifiers equally, a symmetric Wilkinson power distribution is used. Finally, using a load modulation method, a suitable power coupler is designed and simulated to combine the proper output of two amplifiers. Using the MRFG351010 transistor as an active component with GaAs-pHEMT technology, the maximum output power of 20-watts is achieved at a maximum output of 65.46% and power gain of 8.56dB. The maximum output power and power added efficiency in the saturation region of the transistor with 6dB output back off (OBO) is 36dBm and 25.3%, respectively.