A dual-input digitally driven doherty amplifier architecture for performance enhancement of Doherty transmitters

Ramzi Darraji; Fadhel M. Ghannouchi; Oualid Hammi

doi:10.1109/TMTT.2011.2106137

A dual-input digitally driven doherty amplifier architecture for performance enhancement of Doherty transmitters

Ramzi Darraji^*
, Fadhel M. Ghannouchi
, Oualid Hammi

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

Research output: Contribution to journal › Article › peer-review

125 Scopus citations

Abstract

In this paper, the novel architecture of a dual-input and digitally driven Doherty amplifier is proposed with the aim of improving the performance of gallium-nitride (GaN) Doherty transmitters. In this work, the power efficiency is enhanced by using digital adaptive phase alignment to compensate for performance degradation due to bias and power-dependant phase misalignment between the carrier and peaking branches. For experimental validation, the proposed dual-input digital Doherty power amplifier (PA) was implemented using a 10-W GaN transistor. Measurement results demonstrate that the dual-input Doherty prototype exhibited a power-added efficiency (PAE) higher than 50% over an 8-dB output power back-off (OPBO) range. In comparison with the conventional fully analog Doherty PA, this represents a 10% improvement in PAE over the same OPBO range. Using a one-carrier Worldwide Interoperability for Microwave Access signal with a 7-dB peak-to-average power ratio, the dual-input Doherty PA, with digital adaptive phase alignment applied at the input of its peaking path, achieved a PAE of 57% at an average output power of 37.8 dBm, along with a -22-dBc adjacent channel power ratio (ACPR). This corresponds to an improvement of 7% in PAE and 1 dB in average output power for the same ACPR level in comparison with a conventional fully analog Doherty PA.

Original language	English
Article number	5710608
Pages (from-to)	1284-1293
Number of pages	10
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	59
Issue number	5
DOIs	https://doi.org/10.1109/TMTT.2011.2106137
State	Published - May 2011

Bibliographical note

Funding Information:
Manuscript received November 16, 2010, accepted December 17, 2010. Date of publication February 10, 2011; date of current version May 11, 2011. This work was supported by Alberta Innovates Technology Futures (AITF), the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canadian Space Agency (CSA), Focus Microwaves, Nanowave Technologies, and the Canada Research Chairs (CRC) Program.

Keywords

Digital adaptive phase alignment
dual-input Doherty power amplifier (PA)
gallium nitride (GaN)
load modulation
power-added efficiency (PAE)

ASJC Scopus subject areas

Radiation
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/TMTT.2011.2106137

Cite this

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title = "A dual-input digitally driven doherty amplifier architecture for performance enhancement of Doherty transmitters",

abstract = "In this paper, the novel architecture of a dual-input and digitally driven Doherty amplifier is proposed with the aim of improving the performance of gallium-nitride (GaN) Doherty transmitters. In this work, the power efficiency is enhanced by using digital adaptive phase alignment to compensate for performance degradation due to bias and power-dependant phase misalignment between the carrier and peaking branches. For experimental validation, the proposed dual-input digital Doherty power amplifier (PA) was implemented using a 10-W GaN transistor. Measurement results demonstrate that the dual-input Doherty prototype exhibited a power-added efficiency (PAE) higher than 50\% over an 8-dB output power back-off (OPBO) range. In comparison with the conventional fully analog Doherty PA, this represents a 10\% improvement in PAE over the same OPBO range. Using a one-carrier Worldwide Interoperability for Microwave Access signal with a 7-dB peak-to-average power ratio, the dual-input Doherty PA, with digital adaptive phase alignment applied at the input of its peaking path, achieved a PAE of 57\% at an average output power of 37.8 dBm, along with a -22-dBc adjacent channel power ratio (ACPR). This corresponds to an improvement of 7\% in PAE and 1 dB in average output power for the same ACPR level in comparison with a conventional fully analog Doherty PA.",

keywords = "Digital adaptive phase alignment, dual-input Doherty power amplifier (PA), gallium nitride (GaN), load modulation, power-added efficiency (PAE)",

author = "Ramzi Darraji and Ghannouchi, \{Fadhel M.\} and Oualid Hammi",

note = "Funding Information: Manuscript received November 16, 2010, accepted December 17, 2010. Date of publication February 10, 2011; date of current version May 11, 2011. This work was supported by Alberta Innovates Technology Futures (AITF), the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canadian Space Agency (CSA), Focus Microwaves, Nanowave Technologies, and the Canada Research Chairs (CRC) Program.",

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A dual-input digitally driven doherty amplifier architecture for performance enhancement of Doherty transmitters

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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