Optimized Envelope Tracking Power Supply for Tetra2 Base Station RF Power Amplifier

Mikkel Christian Wendelboe Høyerby, Michael Andreas E. Andersen

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An ultra-fast tracking power supply (UFTPS) for envelope tracking in a 50kHz 64-QAM Tetra2 base station power amplification system is demonstrated. A simple method for optimizing the step response of the PID+PD sliding-mode control system is presented and demonstrated, along with a PLL-based scheme for locking the switching frequency to an external clock. High UFTPS efficiency (up to 95%), very low ripple (5mVpp) and a fast step response (10μs) are obtained from a single-phase buck converter with a 4th-order output filter. This ripple performance is demonstrated to be critical in the considered application. Also demonstrated is the effect of non-zero UFTPS output impedance on envelope tracking performance. At 13W average (156W peak) RF output, a reduction of DC input power consumption from 93W (14% efficiency) to 54W (24% efficiency) is obtained by moving from a fixed RF power amplifier supply to envelope tracking.
Original languageEnglish
Title of host publicationApplied Power Electronics Conference and Exposition
Publication date2008
ISBN (Print)978-1-4244-1874-9
Publication statusPublished - 2008
Event23rd Applied Power Electronics Conference - Austin, TX, United States
Duration: 24 Feb 200828 Feb 2008
Conference number: 23


Conference23rd Applied Power Electronics Conference
Country/TerritoryUnited States
CityAustin, TX
Internet address


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