Simple and low-cost tracking generator design in envelope tracking radio frequency power amplifier system for WCDMA applications

Yusoff, Zubaida, Lees, Jonathan ORCID: https://orcid.org/0000-0002-6217-7552, Chaudhary, Muhammad Akmal, Carrubba, Vincenzo, Choi, Heungjae ORCID: https://orcid.org/0000-0003-1108-293X, Tasker, Paul J. ORCID: https://orcid.org/0000-0002-6760-7830 and Cripps, Stephen Charles ORCID: https://orcid.org/0000-0002-2258-951X 2013. Simple and low-cost tracking generator design in envelope tracking radio frequency power amplifier system for WCDMA applications. IET Microwaves, Antennas & Propagation 7 (10) , pp. 802-808. 10.1049/iet-map.2013.0091

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Abstract

A simple analogue technique called auxiliary envelope tracking, or AET, is presented, which is shown to be capable of improving the efficiency of a radio frequency power amplifier (RFPA). This AET signal is an amplified envelope signal that supplies the drain port of the RFPA. The concept of AET is explained and a theoretical background for the technique is presented. The main feature of this technique lies in the separation of the DC and AC components of the tracking signal. This allows for a very simple and low-cost tracking generator design that consists of a simple source follower amplifier and an RF broadband transformer. A practical system has been implemented and the measured results are obtained for WCDMA signals. A measurement on the realised system shows a 50% improvement in the drain efficiency at average output power of 33 dBm of a 25 W GaN. This substantial improvement is achieved at a competitive WCDMA signal with peak-to-average envelope power ratio of 9.17 dB.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Publisher:	Institution of Engineering and Technology
ISSN:	1751-8725
Last Modified:	27 Oct 2022 08:50
URI:	https://orca.cardiff.ac.uk/id/eprint/63536

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