Abstract
Abstract Continuous inverse class-F (CICF) is a recent mode of harmonically-tuned RF power amplifiers used to extend the operating bandwidth of the conventional narrowband class-F−1 power amplifier by producing variable set of drain current waveforms and load admittances that give the same operating efficiency. In this work, a new approach of analysis is developed by suggesting some modified drain current waveforms and comparing the resulting theoretical performance characteristics such as drain efficiency and output RF power with the conventional type. It has been shown that the drain current with a truncated square wave shape can better model the actual behavior of the power amplifier, delivering a theoretical efficiency higher by about 8% than the conventional shape. Besides, a simple analytic technique for extracting the device harmonic load impedances for the desired band is also presented. Based on the theoretical analysis, a 6 W power amplifier circuit was designed and simulated to operate within the frequency band 800 – 1000 MHz. Simulation results indicated that a drain efficiency of values between 82% and 86% was obtained across the specified band.
Highlights
RF power amplifiers are key elements in modern mobile radio systems
In the continuous inverse class-F mode, the fundamental and second harmonic load admittances are allowed to vary over a specified range of values while keeping the same RF performance
The RF power GaN HEMT CGH40006P has been selected for this design
Summary
RF power amplifiers are key elements in modern mobile radio systems. Their most significant design characteristics are DC-to-RF efficiency, output RF power, linearity, and operating bandwidth. In the continuous inverse class-F mode, the fundamental and second harmonic load admittances are allowed to vary over a specified range of values while keeping the same RF performance This technique introduces a flexible design space instead of presenting open or short-circuit impedances, thereby permitting wider bandwidth. The proposed analytic approach provides better estimation for the required fundamental and harmonic load impedances and thereby introduces closer theoretical prediction for efficiency and RF performance when compared with the conventional CICF power amplifier analysis developed originally by Carrubba et al [6]. The drain current waveform with 2nd and 3rd harmonic tuning provides comparable efficiency to that of the conventional case, but the harmonic components of the drain current are different as predicted in (23), (24), and (25) This gives slightly different shapes for the current signal patterns and load admittances.
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