Next Article in Journal
A Fast Transient Response Digital LDO with a TDC-Based Signal Converter
Previous Article in Journal
Safety Risk Assessment of a Pb-Zn Mine Based on Fuzzy-Grey Correlation Analysis
Previous Article in Special Issue
Two-Phase Resonant Converter to Drive High-Power LED Lamps
Open AccessFeature PaperArticle

Adapting Techniques to Improve Efficiency in Radio Frequency Power Amplifiers for Visible Light Communications

1
Power Supplies Group—Electrical Engineering Department of the University of Oviedo, 33204 Gijon, Spain
2
Center for Industrial Electronics—Polytechnic University of Madrid, 28006 Madrid, Spain
3
Thyssenkrupp Elevator Innovation Center S A U—Thyssenkrupp AG, 33203 Gijon, Spain
*
Author to whom correspondence should be addressed.
Electronics 2020, 9(1), 131; https://doi.org/10.3390/electronics9010131
Received: 30 November 2019 / Revised: 30 December 2019 / Accepted: 3 January 2020 / Published: 10 January 2020
(This article belongs to the Special Issue Latest Developments in LED Drivers)
It is well known that modern wireless communications systems need linear, wide bandwidth, efficient Radio Frequency Power Amplifiers (RFPAs). However, conventional configurations of RFPAs based on Class A, Class B, and Class AB exhibit extremely low efficiencies when they manage signals with a high Peak-to-Average Power Ratio (PAPR). Traditionally, a number of techniques have been proposed either to achieve linearity in the case of efficient Switching-Mode RFPAs or to improve the efficiency of linear RFPAs. There are two categories in the application of aforementioned techniques. First, techniques based on the use of Switching-Mode DC–DC converters with a very-fast-output response (faster than 1 µs). Second, techniques based on the interaction of several RFPAs. The current expansion of these techniques is mainly due to their application in cellphone networks, but they can also be applied in other promising wireless communications systems such as Visible Light Communication (VLC). The main contribution of this paper is to show how Envelope Tracking (ET), Envelope and Elimination (EER), Outphasing, and Doherty techniques can be helpful in developing more efficient VLC transmitters capable of reaching high bit-rates (higher than 1 Mbps) by using advance modulation schemes. Finally, two examples based on the application of the Outphasing technique and the use of a Linear-Assisted Envelope Amplifier (EA) to VLC are presented and experimentally verified. View Full-Text
Keywords: visible light communication (VLC); light emitting diodes (LED); switching-mode; DC–DC converters and radio frequency power amplifiers (RFPA) visible light communication (VLC); light emitting diodes (LED); switching-mode; DC–DC converters and radio frequency power amplifiers (RFPA)
Show Figures

Figure 1

MDPI and ACS Style

Aller, D.G.; Lamar, D.G.; Rodriguez, J.; Miaja, P.F.; Romero, V.F.; Mendiolagoitia, J.; Sebastian, J. Adapting Techniques to Improve Efficiency in Radio Frequency Power Amplifiers for Visible Light Communications. Electronics 2020, 9, 131.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop