Inverted-load network for high-power Doherty amplifier

Kwon, Seunglee; Kim, Minsu; Jung, Sunghoon; Jeong, Ju Seon; Lim, Kyung Taek; Van, Ju-ho; Cho, Hanjin; Kim, Hyungchul; Nah, Wansoo; Yang, Youngoo

doi:10.1109/mmm.2008.930680

Cited by 15 publications

(6 citation statements)

References 7 publications

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“…The inverted DPA provides the high efficiency at the low drive level; however, the key challenge of the inverted DPA is designing the output matching networks of the carrier and peaking amplifiers. Figure 8b shows an example of fabricated 190W IDPA with the final stage in 14 × 8 cm 2 case [58].…”

Section: Inverted Doherty Pamentioning

confidence: 99%

A Survey on RF and Microwave Doherty Power Amplifier for Mobile Handset Applications

et al. 2019

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This survey addresses the cutting-edge load modulation microwave and radio frequency power amplifiers for next-generation wireless communication standards. The basic operational principle of the Doherty amplifier and its defective behavior that has been originated by transistor characteristics will be presented. Moreover, advance design architectures for enhancing the Doherty power amplifier’s performance in terms of higher efficiency and wider bandwidth characteristics, as well as the compact design techniques of Doherty amplifier that meets the requirements of legacy 5G handset applications, will be discussed.

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Section: Inverted Doherty Pamentioning

confidence: 99%

A Survey on RF and Microwave Doherty Power Amplifier for Mobile Handset Applications

et al. 2019

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“…The two current sources I C and I P represent the equivalent of carrier and peaking amplifier. Thus, the impedances seen at the junction J from each side, due to the interaction of the carrier and peaking current I C and I P respectively, are given by [1]- [5] 0 ,max 0 ,max ,max…”

Section: Inverted Doherty Operation and Modified Archietecturementioning

confidence: 99%

“…In order to improve the efficiency at OPBO, the DPA has been proposed several decades ago which operates on the concept of active load modulation [2]- [3]. During last decade several improvements have been proposed in the DPA architecture, among which, inverted Doherty power amplifier (IDPA) is the one which utilizes phase offset lines to achieve high efficiency operation at OPBO [4]- [5]. This conventional IDPA architecture also utilizes 50 Ω quarterwave transformer in the load modulation circuit.…”

Section: Introductionmentioning

confidence: 99%

“…This conventional IDPA architecture also utilizes 50 Ω quarterwave transformer in the load modulation circuit. However, this transformer is only used to reduce the length of peaking path phase offset transmission line [4]- [5]. Thus if the requirement of this length reduction is not critical, one can remove this 50 Ω quarter-wave transformer without compromising the overall performance.…”

Section: Introductionmentioning

confidence: 99%

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Load-pull assisted cad design of inverted Doherty Amplifier without quarter-wave transformer

Rawat

Ghannouchi

2012

2012 25th IEEE Canadian Conference on Electrical and Computer Engineering (CCECE)

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This paper presents novel design and architecture for inverted Doherty Amplifier. The key point is the removal of the 50 Ω quarter-wave transformer from peaking path used for impedance inversion in a load modulation circuit of a typical inverted Doherty Amplifier. A coupled line is used as all-pass section providing the desired phase offset to achieve high efficiency performance at back-off. This coupled line thus designed as an all-pass filter section with shaped phase characteristic and a 50 Ω image impedance that can be used directly to optimize the inverted Doherty performance. A prototype has been designed to operate at 2350 MHz for Long term evolution (LTE) application. An improvement of more than 25% in the drain efficiency as compared to the Class-B balanced amplifier at approximately 6-dB back-off is reported with this design.Index Terms-Inverted Doherty power amplifier, all pass section, phase offset.

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“…Figure 1 is shown as the diagram of IDPA. Compared with the conventional DPAs, the IDPA has almost the same principle [16]. There are two branches in IDPA, the carrier amplifier and the peak amplifier.…”

Section: Introductionmentioning

confidence: 99%

A broadband inverted Doherty power amplifier for IEEE 802.11b/g WLAN applications

Jin

Zhou

Zhang

2011

Micro & Optical Tech Letters

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In this article, we successfully validated the VSTF on coherent optical ultradense WDM and analyzed the transmission impact of XPM/FWM on 16-QAM signals. From the studies it is visible that for mixed phase/amplitude coherent signals, in the higher power symbols we will have similar degradation caused by XPM and FWM, and it becomes more visible for longer fibers.|| ACKNOWLEDGMENTS This work was supported by the EURO-FOS project, a Network of Excellence funded by the EU 7th ICT-FP. J.D. Reis also acknowledges his PhD grant from FCT (SFRH/43941/2008). 2. X. Zhou et al., 64-Tb/s (640X107-Gb/s) PDM-36QAM Transmission over 320km using both pre-and post-transmission digital equalization, In: Proceedings of Conference Optical Fiber Communication (OFC), 2010, p.PDPB9. 3. K.V. Peddanarappagari and B.M. Pearce, Volterra series transfer function of single-mode fibers, IEEE/OSA J Lightwave Technol 15 (1997), 2232-2241. 4. R. Weidenfeld, M. Nazarathy, R. Noe, and I. Shpatzer, Volterra nonlinear compensation of 112 Gb/s ultra-long-haul coherent optical OFDM based on frequency-shaped decision feedback, In:

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Inverted-load network for high-power Doherty amplifier

Cited by 15 publications

References 7 publications

A Survey on RF and Microwave Doherty Power Amplifier for Mobile Handset Applications

A Survey on RF and Microwave Doherty Power Amplifier for Mobile Handset Applications

Load-pull assisted cad design of inverted Doherty Amplifier without quarter-wave transformer

A broadband inverted Doherty power amplifier for IEEE 802.11b/g WLAN applications

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