Efficiency Enhancement of an Envelope Tracking Power Amplifier Combining Supply Shaping and Dynamic Biasing

Felice Francesco Tafuri, Daniel Sira, Ole Kiel Jensen, Torben Larsen

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

This paper presents a new method to improve the performance of envelope tracking (ET) power amplifiers (PAs). The method consists of combining the supply modulation that characterizes the envelope tracking architecture with supply shaping and dynamic biasing. The inclusion of dynamic biasing allows a dynamic minimization of the current consumption while imposing simultaneously a constant gain condition. In such a way we maximize the efficiency of the ET transmitter maintaining a considerable linearity. Bias and supply voltages are modulated applying specific waveforms obtained as a function of the input envelope by means of two shaping functions jointly designed on the basis of a single-tone characterization. The presented technique is demonstrated by means of measurements on a commercial GaAs HBT power amplifier. Measured results showed a PA power added efficiency (PAE) of 51.9%, an error vector magnitude (EVM) of 1.2% and an adjacent channel power ratio (ACPR) of -39.4/-43.5 dBc. The presented transmitter architecture allowed an improvement of 12% PAE compared to a classical ET transmitter where the measured PA was biased in class-AB, maintaining the linearity indicators.
Original languageEnglish
Title of host publicationProceedings of the 8th European Microwave Integrated Circuits Conference
Number of pages4
PublisherIEEE
Publication dateOct 2013
Pages520-523
Publication statusPublished - Oct 2013
EventEuropean Microwave Week - Nuremberg, Germany
Duration: 6 Oct 201311 Oct 2013

Conference

ConferenceEuropean Microwave Week
CountryGermany
CityNuremberg
Period06/10/201311/10/2013

Fingerprint

Power amplifiers
Transmitters
Heterojunction bipolar transistors
Modulation
Electric potential

Cite this

Tafuri, F. F., Sira, D., Jensen, O. K., & Larsen, T. (2013). Efficiency Enhancement of an Envelope Tracking Power Amplifier Combining Supply Shaping and Dynamic Biasing. In Proceedings of the 8th European Microwave Integrated Circuits Conference (pp. 520-523). IEEE.
Tafuri, Felice Francesco ; Sira, Daniel ; Jensen, Ole Kiel ; Larsen, Torben. / Efficiency Enhancement of an Envelope Tracking Power Amplifier Combining Supply Shaping and Dynamic Biasing. Proceedings of the 8th European Microwave Integrated Circuits Conference. IEEE, 2013. pp. 520-523
@inproceedings{cfcbac7cd93e4cfa81f3b7a304356cdf,
title = "Efficiency Enhancement of an Envelope Tracking Power Amplifier Combining Supply Shaping and Dynamic Biasing",
abstract = "This paper presents a new method to improve the performance of envelope tracking (ET) power amplifiers (PAs). The method consists of combining the supply modulation that characterizes the envelope tracking architecture with supply shaping and dynamic biasing. The inclusion of dynamic biasing allows a dynamic minimization of the current consumption while imposing simultaneously a constant gain condition. In such a way we maximize the efficiency of the ET transmitter maintaining a considerable linearity. Bias and supply voltages are modulated applying specific waveforms obtained as a function of the input envelope by means of two shaping functions jointly designed on the basis of a single-tone characterization. The presented technique is demonstrated by means of measurements on a commercial GaAs HBT power amplifier. Measured results showed a PA power added efficiency (PAE) of 51.9{\%}, an error vector magnitude (EVM) of 1.2{\%} and an adjacent channel power ratio (ACPR) of -39.4/-43.5 dBc. The presented transmitter architecture allowed an improvement of 12{\%} PAE compared to a classical ET transmitter where the measured PA was biased in class-AB, maintaining the linearity indicators.",
author = "Tafuri, {Felice Francesco} and Daniel Sira and Jensen, {Ole Kiel} and Torben Larsen",
year = "2013",
month = "10",
language = "English",
pages = "520--523",
booktitle = "Proceedings of the 8th European Microwave Integrated Circuits Conference",
publisher = "IEEE",
address = "United States",

}

Tafuri, FF, Sira, D, Jensen, OK & Larsen, T 2013, Efficiency Enhancement of an Envelope Tracking Power Amplifier Combining Supply Shaping and Dynamic Biasing. in Proceedings of the 8th European Microwave Integrated Circuits Conference. IEEE, pp. 520-523, European Microwave Week, Nuremberg, Germany, 06/10/2013.

Efficiency Enhancement of an Envelope Tracking Power Amplifier Combining Supply Shaping and Dynamic Biasing. / Tafuri, Felice Francesco; Sira, Daniel; Jensen, Ole Kiel; Larsen, Torben.

Proceedings of the 8th European Microwave Integrated Circuits Conference. IEEE, 2013. p. 520-523.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

TY - GEN

T1 - Efficiency Enhancement of an Envelope Tracking Power Amplifier Combining Supply Shaping and Dynamic Biasing

AU - Tafuri, Felice Francesco

AU - Sira, Daniel

AU - Jensen, Ole Kiel

AU - Larsen, Torben

PY - 2013/10

Y1 - 2013/10

N2 - This paper presents a new method to improve the performance of envelope tracking (ET) power amplifiers (PAs). The method consists of combining the supply modulation that characterizes the envelope tracking architecture with supply shaping and dynamic biasing. The inclusion of dynamic biasing allows a dynamic minimization of the current consumption while imposing simultaneously a constant gain condition. In such a way we maximize the efficiency of the ET transmitter maintaining a considerable linearity. Bias and supply voltages are modulated applying specific waveforms obtained as a function of the input envelope by means of two shaping functions jointly designed on the basis of a single-tone characterization. The presented technique is demonstrated by means of measurements on a commercial GaAs HBT power amplifier. Measured results showed a PA power added efficiency (PAE) of 51.9%, an error vector magnitude (EVM) of 1.2% and an adjacent channel power ratio (ACPR) of -39.4/-43.5 dBc. The presented transmitter architecture allowed an improvement of 12% PAE compared to a classical ET transmitter where the measured PA was biased in class-AB, maintaining the linearity indicators.

AB - This paper presents a new method to improve the performance of envelope tracking (ET) power amplifiers (PAs). The method consists of combining the supply modulation that characterizes the envelope tracking architecture with supply shaping and dynamic biasing. The inclusion of dynamic biasing allows a dynamic minimization of the current consumption while imposing simultaneously a constant gain condition. In such a way we maximize the efficiency of the ET transmitter maintaining a considerable linearity. Bias and supply voltages are modulated applying specific waveforms obtained as a function of the input envelope by means of two shaping functions jointly designed on the basis of a single-tone characterization. The presented technique is demonstrated by means of measurements on a commercial GaAs HBT power amplifier. Measured results showed a PA power added efficiency (PAE) of 51.9%, an error vector magnitude (EVM) of 1.2% and an adjacent channel power ratio (ACPR) of -39.4/-43.5 dBc. The presented transmitter architecture allowed an improvement of 12% PAE compared to a classical ET transmitter where the measured PA was biased in class-AB, maintaining the linearity indicators.

M3 - Article in proceeding

SP - 520

EP - 523

BT - Proceedings of the 8th European Microwave Integrated Circuits Conference

PB - IEEE

ER -

Tafuri FF, Sira D, Jensen OK, Larsen T. Efficiency Enhancement of an Envelope Tracking Power Amplifier Combining Supply Shaping and Dynamic Biasing. In Proceedings of the 8th European Microwave Integrated Circuits Conference. IEEE. 2013. p. 520-523