An 80MHz modulation bandwidth high efficiency multi-band envelope-tracking power amplifier using GaN single-phase buck-converter

Sakata, Shuichi; Lanfranco, Sandro; Kolmonen, Tapio; Piirainen, Olli; Fujiwara, Takanobu; Shinjo, Shintaro; Asbeck, P.M.

doi:10.1109/mwsym.2017.8059016

Cited by 23 publications

(6 citation statements)

References 6 publications

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“…12 and Fig. 13 The design was carried out by circuit simulation similar to the 800 MHz band. The harmonic impedance termination circuit is configured to insert an open stub of 1/4 wavelength in length at the harmonics into a transmission line to obtain the maximum phase efficiency.…”

Section: Ghz Band Outphasing Amplifier Trial Resultsmentioning

confidence: 99%

“…These technologies include three classical technologies: an outphasing amplifier [4] proposed by Henri Chireix in 1935, Doherty amplifier [5] proposed by William H. Doherty in 1936, and envelope elimination and restoration (EER) technology [6] proposed by Leonard R. Kahn in 1952; and each of these has been under research for improvement [7 -12]. In addition to the above three technologies, new high-efficiency technologies such as envelope tracking (ET) technology [13], envelope pulse width modulation (EPWM) technology using a deltasigma modulator [14], and load-modulated balanced amplifier (LMBA) [15] have been reported. As is well known, there is a trade-off between good linearity and high efficiency in power amplifiers.…”

Section: Introductionmentioning

confidence: 99%

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How to Design an Outphasing Power Amplifier with Digital Predistortion

Kimura

Kawasaki

2021

IEICE Trans. Electron.

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How to design an outphasing power amplifier with digital predistortionShigekazu KIMURA †a) , member and Toshio KAWASAKI † , Non-member SUMMARY For improving the fifth-generation mobile communication system, a highly efficient power amplifier must be designed for the base station. An outphasing amplifier is expected to be a solution for achieving high efficiency. We designed a combiner, one of the key components of the outphasing amplifier, using a serial Chireix combiner and fabricated an amplifier with a GaN HEMT, achieving 70% or more high efficiency up to 9 dB back-off power in an 800 MHz band. We also fabricated a 2 GHz-band outphasing amplifier with the same design. We applied digital predistortion (DPD) to control the balance of amplifying units in this amplifier and achieved an average efficiency of 65% under a 20 MHz modulation bandwidth.

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Section: Ghz Band Outphasing Amplifier Trial Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

How to Design an Outphasing Power Amplifier with Digital Predistortion

Kimura

Kawasaki

2021

IEICE Trans. Electron.

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“…To address these problems, some new types of Doherty amplifiers have been proposed to date [5][6][7][8][9][10][11][12][13]. For efficiency enhancement at arbitrary back-off levels, GaN envelope tracking (ET) amplifiers have already been proposed [14,15]. It has long been considered that ET amplifier is NOT suitable for BTS HPAs.…”

Section: Hpa Technology Trend In Sub6 Ghzmentioning

confidence: 99%

Overview and Prospects of High Power Amplifier Technology Trend for 5G and beyond 5G Base Stations

Yamanaka

Shinjo

Komatsuzaki

et al. 2021

IEICE Trans. Electron.

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senior member, Shintaro SHINJO † , senior member, Yuji KOMATSUZAKI † , member, Shuichi SAKATA † , member, Keigo NAKATANI † , member, Yutaro YAMAGUCHI † , member SUMMARY High power amplifier technologies for base transceiver stations (BTSs) for the 5th generation (5G) mobile communication systems and so-called beyond 5G (B5G) systems are reviewed. For sub-6, which is categorized into frequency range 1 (FR1) in 5G, wideband Doherty amplifiers are introduced, and a multi-band load modulation amplifier, an envelope tracking amplifier, and a digital power amplifier for B5G are explained. For millimeter wave 5G, which is categorized into frequency range 2 (FR2), GaAs and GaN MMICs operating at around 28GHz are introduced. Finally, future prospect for THz GaN devices is described.

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“…Typically, this bandwidth will be in the order of 1-10 kHz [36]- [38]. While dc-to-dc converters can be designed to operate at higher switching frequencies to improve their control speed, this comes at the cost of extra loss and reduced efficiency [39]- [41], making this method ill-suited for high-speed high-power power control.…”

Section: A DC Input Voltage Adjustmentmentioning

confidence: 99%

Modular ON/OFF and Phase-Shifting for High-Speed Radio Frequency Power Modulation

Surakitbovorn

Rivas-Davila

2020

IEEE Open J. Power Electron.

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Radio frequency (RF) power amplifiers are an integral part of many academic, medical, and industrial applications. For many of these applications, the RF power needs to quickly transition from one level to another. For switched-mode amplifiers, one way to achieve this is with an out-phasing modulation technique. This power control technique, however, presents its own disadvantages, including poor light-load efficiency and an increase in overall system size. In this paper, we present an alternative power modulation method to create a high-efficiency high-speed RF amplifier system. This control technique utilizes two mechanisms, modular on/off and phase-shifting. In modular on/off, a different number of sub-circuits are turned "on" or "off" to crudely adjust the output power. In phase-shifting, the smallest sub-circuit of the whole system is phase-shifted away from the rest of the circuit to fine-tune the output power. This system's performance is first compared with existing out-phasing systems via circuit simulation. Then, an actual circuit implementation with a 13.56-MHz, 1500-W RF amplifier is demonstrated. A 93% dc-to-RF efficiency is achieved at full load, and above 80% efficiency is maintained all the way down to 7% load.

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An 80MHz modulation bandwidth high efficiency multi-band envelope-tracking power amplifier using GaN single-phase buck-converter

Cited by 23 publications

References 6 publications

How to Design an Outphasing Power Amplifier with Digital Predistortion

How to Design an Outphasing Power Amplifier with Digital Predistortion

Overview and Prospects of High Power Amplifier Technology Trend for 5G and beyond 5G Base Stations

Modular ON/OFF and Phase-Shifting for High-Speed Radio Frequency Power Modulation

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