Self-Oscillating Soft Switching Envelope Tracking Power Supply for Tetra2 Base Station

Mikkel Christian Wendelboe Høyerby, Michael Andreas E. Andersen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


This paper presents a high-efficiency, high-bandwidth solution to implementing an envelope tracking power supply for the RF power amplifier (RFPA) in a Tetra2 base station. The solution is based on synchronous rectified buck topology, augmented with high-side switch zero-current switching (ZCS) implemented with a series inductor and an external clamping power supply. Combined with advanced power stage components (die-size MOSFETs), a high-performance fixed-frequency self-oscillating (sliding mode) control strategy and a 4th-order output filter, this leads to a compact, effective and efficient overall solution switching at 1MHz with 88-95% efficiency. In a class-AB RFPA amplifying a 50kHz bandwidth QAM Tetra2 signal at 4.6W average output power, the use of tracking supply voltage reduced power dissipation by 25W.
Original languageEnglish
Title of host publicationINTELEC 2007
Publication date2007
Publication statusPublished - 2007
EventINTELEC 2007 - Rome, Italy
Duration: 1 Jan 2007 → …


ConferenceINTELEC 2007
CityRome, Italy
Period01/01/2007 → …

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