What is it about?
Self envelope-tracking is one of power amplifier design techniques to improve the power efficiency while maintaining simple implementation. This work introduces a novel circuit, which for the first time demonstrates a 40-MHz modulation bandwidth with self envelope-tracking. Envelope-tracking works like the automatic transmission system of automobiles, continuously providing the exact amount of power for the radio-frequency signal emission. This typically results in more than 50% improvement in power efficiency compared to power amplifiers without envelope-tracking.
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Why is it important?
Conventional envelope-tracking power amplifiers commonly suffer from additional cost and complexity for dynamic supply voltage modulation that are necessary to realize the envelope-tracking operation. Recently, self-envelope tracking techniques were introduced, which can achieve a comparable power efficiency while significantly reducing cost and complexity to realize envelope tracking.
Perspectives
Envelope-tracking has been popularly adopted by industry for 4G and 5G mobile communication, which requires a very wide bandwidth. The unique advantage of self-envelope tracking technique proposed in this work will play an important role in advancing the 5G mobile communication devices by reducing the system costs and complexity.
SUNGWON CHUNG
University of Southern California
Read the Original
This page is a summary of: Design considerations on wideband envelope termination for high efficiency RF power amplifiers, Electronics Letters, March 2016, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/el.2015.4328.
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