A Variable Envelope Outphasing Concept for Transmitter Linearization
Momor, Kingsley; Khan, Bilal; Pärssinen, Aarno; Tervo, Nuutti (2025-03-04)
IEEE
04.03.2025
K. Momor, B. Khan, A. Pärssinen and N. Tervo, "A Variable Envelope Outphasing Concept for Transmitter Linearization," 2025 IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR), San Juan, PR, USA, 2025, pp. 63-66, doi: 10.1109/PAWR63954.2025.10904037.
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© 2025 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202503182070
https://urn.fi/URN:NBN:fi:oulu-202503182070
Tiivistelmä
Abstract
Outphasing transmitter is typically implemented by dividing amplitude-varying waveform into multiple power amplifier (PA) paths with zero peak-to-average-power ratios (PAPR) per path. This arrangement provides linear output for the combined signal with high amplifier efficiency. However, due to the combining of outphased signals, the output power of the combined signal is compromised. In this paper, we present a novel concept called variable envelope outphasing (VEOP), which allows the possibility of systematically distributing the time-varying amplitude of the signal to the common and outphasing parts. This provides a valuable tool to balance the linearity and output power and thus produce a high-PAPR signal as a sum of lower PAPR signals. The proposed VEOP concept is demonstrated through conductive measurements at 2.4 GHz. The experimental results show that the choice of PAPR distribution before and after the amplification stage through VEOP provides linearity and achieved output power trade-off.
Outphasing transmitter is typically implemented by dividing amplitude-varying waveform into multiple power amplifier (PA) paths with zero peak-to-average-power ratios (PAPR) per path. This arrangement provides linear output for the combined signal with high amplifier efficiency. However, due to the combining of outphased signals, the output power of the combined signal is compromised. In this paper, we present a novel concept called variable envelope outphasing (VEOP), which allows the possibility of systematically distributing the time-varying amplitude of the signal to the common and outphasing parts. This provides a valuable tool to balance the linearity and output power and thus produce a high-PAPR signal as a sum of lower PAPR signals. The proposed VEOP concept is demonstrated through conductive measurements at 2.4 GHz. The experimental results show that the choice of PAPR distribution before and after the amplification stage through VEOP provides linearity and achieved output power trade-off.
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