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Mathematical Problems in Engineering
Volume 2017 (2017), Article ID 1390295, 19 pages
Research Article

On Optimal Truncated Biharmonic Current Waveforms for Class-F and Inverse Class-F Power Amplifiers

1Department of Power, Electronics and Communication Engineering, Faculty of Technical Sciences, University of Novi Sad, Trg D. Obradovica 6, 21000 Novi Sad, Serbia
2Computer Science Department, Indiana University Bloomington, 150 S. Woodlawn Ave., Bloomington, IN 47405, USA

Correspondence should be addressed to Ladislav A. Novak

Received 4 October 2016; Revised 25 January 2017; Accepted 1 February 2017; Published 16 March 2017

Academic Editor: Alessandro Lo Schiavo

Copyright © 2017 Anamarija Juhas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this paper, two-parameter families of periodic current waveforms for class-F and inverse class-F power amplifiers (PAs) are considered. These waveforms are obtained by truncating cosine waveforms composed of dc component and fundamental and either second or third harmonic. In each period, waveforms are truncated to become zero outside of a prescribed interval (so-called conduction angle). The considered families of waveforms include both discontinuous and continuous waveforms. Fourier series expansion of truncated waveform contains an infinite number of harmonics, although a number of harmonics may be missing. Taking into account common assumptions that for class-F PA the third harmonic is missing in current waveform and for inverse class-F PA the second harmonic is missing in current waveform, we consider the following four cases: (i) (ii) , (iii) and (iv) , We show that, in each of these cases, current waveform enabling maximal efficiency (optimal waveform) of class-F and inverse class-F PA is continuous for all conduction angles of practical interest. Furthermore, we provide closed-form expressions for parameters of optimal current waveforms and maximal efficiency of class-F (inverse class-F) PA in terms of conduction angle only. Two case studies of practical interest for PA design, involving suboptimal current waveforms, along with the results of nonlinear simulation of inverse class-F PA, are also presented.