GALLIUM NITRIDE BASED WIDEBAND DISTRIBUTED POWER AMPLIFIER

Abstract

Broadband power amplifiers are a vital components in transmitting the signal of larger bandwidth. Some of the modern broad-band amplification techniques are Lossy matched configuration, Feedback Amplifier configuration, reactively matched configuration and Distributed amplifier configuration. Among all above mentioned broadband techniques, the distributed power amplification technique is a ground breaking way of getting high bandwidths. This technique has resulted into bandwidth even higher than 100 GHz with good return loss and gain with the cost of the power added efficiency of the amplifier. Therefore, this kind of amplifier suffers from s serious trade-off between achievable bandwidth and power added efficiency. This thesis presents concept of distributed power amplification and discusses some of the restrictions which affects the performance of such amplifiers. With the knowledge of theoretical study, this thesis targets design and implementation of a distributed power amplifier with characteristics of broadband amplification while maintaining very good power added efficiency. This simulation results of the designed distributed power amplifier presented in this thesis shows bandwidth more than 2.2 GHz while maintain power added efficiency greater than 41%. This designed distributed power amplifier has simulated gain 10 dB gain in the whole design band. This thesis also discusses an insight into the parametric behaviour of this kind of amplifier. As there are many interdependent parameters present in the amplifier structure, parametric process becomes very complex. Also due to existence of various inter dependent parameters result optimization is a great challenge in this power amplifier.