A Highly Efficient Broadband Class-E Power Amplifier with Nonlinear Shunt Capacitance

Abstract

A new approach to designing a broadband and highly efficient class-E power amplifier based on nonlinear shunt capacitance analysis is proposed. The nonlinear shunt capacitance method accurately extracts optimum class-E power amplifier parameters, including an external shunt capacitance and an output impedance, at different frequencies. The dependence of the former parameter on the frequency is considered to select an optimal value of external shunt capacitor. Then, upon determining the latter parameter, an output matching network is optimized to obtain the highest efficiency across the bandwidth of interest. An analytical approach is presented to design the broadband class-E power amplifier of a MOSFET transistor. The proposed method is experimentally verified by a 140-170 MHz class-E power amplifier design with maximum added power efficiency of 82% and output power of 34 dBm.Key Words: Broadband, Class-E Power Amplifier, MOSFET Transistor, Nonlinear Output Capacitance, PAE. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. ⓒ

Controlling bifurcated continuous‐mode parameter for the continual operation of Class‐F−1 15 W GaN power amplifier

“…In recent times, considerable research has been conducted on circuit design and measurement techniques for high power, efficiency, and wide bandwidth in various wireless applications. [1][2][3][4][5][6] In this regard, high-efficiency operational modes for power amplifiers (PAs) are introduced, two of which are the Class-F and the inverse Class-F design with resonating circuits, where the harmonic impedances are controlled. These high-Q resonating circuits are incorporated in the output network of the transistors in order to achieve 100% efficiency.…”