12Pre-Distortion: An Effective Solution for Power Amplifier Linearization
Gaurav Bhargava* and Shubhankar Majumdar†
Department of Electronics and Communication Engineering, National Institute of Technology (NIT) Meghalaya, Shillong, Meghalaya, India
Abstract
In the broadband transceiver system, Power Amplifier (PA) has maintained a promising place for transmitting the information at wide space. Many circuits of power amplifier in recent times, utilizes Gallium Nitride (GaN) device, which again plays a crucial part in highly efficient PA design. Several class of power amplifier (D, E, F) has high efficiency (100 %) theoretically. The linearity measure has become important factor for characterization of PA. As day by day the methods of modulation are becoming advanced, it eases the process of linearizing an amplifier setup.
This chapter is presented as an update and an overview of Power Amplifier (PA) linearization. In this chapter, we have discussed basic measures of power amplifier nonlinearities. To overcome the effect of those nonlinearities, various types of linearization techniques are discussed. Among them, Analog pre-distortion (APD) finds better space in field of communication system. For verifying the improved linearization, one combined structure of hybrid EFJ power amplifier with APD linearizer block is developed and simulation results are compared with the state of art of variety of linearization schemes.
Keywords: Radio frequency, gallium nitride, power amplifier, ...
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