Design of a concurrent quad-band GaN-HEMT Doherty power amplifier for wireless applications

“…equal to ܸ ௗ ) for input drive ranging from ܸ ௫ /2 to ܸ ௫ . To accomplish this, ܸ ሬԦ ெ in (17) must be set independent of ߦ, resulting in (18) and (19). For the convenience of subsequent analysis, a new parameter ߙ is introduced.…”

Section: A Main Pa Branchmentioning

confidence: 99%

Toward a More Generalized Doherty Power Amplifier Design for Broadband Operation

Barakat

Thian

Fusco

et al. 2017

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

“…In addition to the dual-band DPA, there are researches which focus on tri-and quad-band DPA [56][57][58][59][60]. A design approach was used in [58] to cover three frequency bands.…”

Section: Tri-band and Quad-band Dpamentioning

confidence: 99%

“…The work of [58] has been extended in [56] to cover quad-band instead of tri-band operation. The chosen bands were 0.9 GHz, 1.5 GHz, 2.1 GHz and 2.6 GHz.…”

Section: Tri-band and Quad-band Dpamentioning

confidence: 99%

Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems

Abdulkhaleq

Yahya

McEwan³

et al. 2019

Electronics

View full text Add to dashboard Cite

Power amplifiers in modern and future communications should be able to handle different modulation standards at different frequency bands, and in addition, to be compatible with the previous generations. This paper reviews the recent design techniques that have been used to operate dual-band amplifiers and in particular the Doherty amplifiers. Special attention is focused on the design methodologies used for power splitters, phase compensation networks, impedance inverter networks and impedance transformer networks of such power amplifier. The most important materials of the dual-band Doherty amplifier are highlighted and surveyed. The main problems and challenges covering dual-band design concepts are presented and discussed. In addition, improvement techniques to enhance such operations are also exploited. The study shows that the transistor parasitic has a great impact in the design of a dual-band amplifier, and reduction of the transforming ratio of the inverter simplifies the dual-band design. The offset line can be functionally replaced by a Π-network in dual-band design rather than T-network.

show abstract

“…To enhance the back-off efficiency, Doherty power amplifier (DPA) has been regarded as the most popular approach due to its significant efficiency enhancement and straightforward hardware implementation [1][2][3][4][5][6][7][8]. By actuating proper load modulation, these DPAs can maintain high efficiency at 6 dB or more back-off powers.…”

Section: Introductionmentioning

confidence: 99%

A Wideband Doherty Power Amplifier With Shunted Reactive Load for Efficiency Enhancement

Kong¹,

Xia²,

Ding³

et al. 2017

PIER C

View full text Add to dashboard Cite

Abstract-A highly efficient Doherty power amplifier (DPA) using shunted reactive load is designed to achieve wideband operation. For enhanced back-off efficiency over the whole bandwidth, a modified load modulation network (LMN), which employs a shunted reactive load at the combining point, was firstly designed to enlarge the effective load impedance of the carrier amplifier at low and high frequencies. Then, the two-point matching approach was employed to design the carrier and peaking output matching networks, which can eliminate the use of offset lines and simplify the LMN. Measurement results show that the designed DPA can deliver an efficiency of 48%-61% at 6 dB back-off power over the frequency band of 2.2-2.9 GHz. For a 20 MHz LTE modulated signal, an average efficiency of higher than 55% can be achieved at an average output power of 37 dBm, while the adjacent channel leakage ratio is below −49 dBc after linearization.

show abstract

Design of a concurrent quad-band GaN-HEMT Doherty power amplifier for wireless applications

Cited by 11 publications

References 9 publications

Toward a More Generalized Doherty Power Amplifier Design for Broadband Operation

Toward a More Generalized Doherty Power Amplifier Design for Broadband Operation

Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems

A Wideband Doherty Power Amplifier With Shunted Reactive Load for Efficiency Enhancement

Contact Info

Product

Resources

About