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3.5
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11 Dec 2012
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B
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07 Aug 2012
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A
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30 Apr 2012
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C
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30 Apr 2012
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A
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30 Apr 2012
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by Junghwan Moon, Young Yun Woo, Bummam Kim
A novel design of the Doherty power amplifier (PA) to improve the efficiency at a back-off output power level.
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Design
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01 Sep 2009
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by David Yu-Ting Wu and Slim Boumaiza
A new Doherty amplifier configuration with an intrinsically broadband characteristic is presented based on the synthesis of key ideas derived from the analyses of the load modulation concept and the conventional Doherty amplifier. Important building blocks to implement the proposed Doherty amplifier structure are outlined, which include the quasi-lumped quarter-wave transmission line, as well as the Klopfenstein taper for broadband impedance matching.
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Design
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01 Oct 2012
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by Jangheon Kim, Junghwan Moon, Jungjoon Kim, Slim Boumaiza, and Bumman Kim
A novel design method without requiring the special harmonic termination circuit for a highly efficient power amplifier (PA) is proposed.
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Design
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01 Sep 2009
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by Raymond S. Pengelly, Simon M. Wood, James W. Milligan, Scott T. Sheppard, and William L. Pribble
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Design
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01 Jun 2012
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by Bumman Kim, Ildu Kim, Junghwan Moon
This article describes the design of a GaN Doherty power amplifier with digital pre-distortion as well as hybrid envelop elimination and restoration / envelop tracking technique (H-EER/ET).
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Article
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01 Aug 2010
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by Raymond S. Pengelly, Brad Millon, Donald Farrell, Bill Pribble, and Simon Wood
Presentation from the 2008 IEEE MTT-S International Microwave Symposium (IMS) Workshop on Challenges in Model-Based HPA Design
This presentation discusses attributes of GaN HEMTs, Cree GaN HEMT models, design examples (Broadband CW Amplifiers and Linear WiMAX Amplifier), and future model improvements.
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Design
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16 Jun 2008
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by David Yu-Ting Wu, Farouk Mkadem, Slim Boumaiza
Abstract — A comprehensive approach for designing broadband and highly efficient power amplifier based on optimal impedance analysis and simplified real frequency technique SRFT) is presented.
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Design
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01 May 2010
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by Junghwan Moon, Jangheon Kim, Jungjoon Kim, Ildu Kim, Bummam Kim
This paper presents an approach to mitigating the knee voltage effect of the Doherty power amplifier (PA), especially on the carrier amplifier.
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Design
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01 Jan 2011
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by Jangheon Kim: Farouk Mkadem; Slim Boumaiza
This paper proposes a new broadband saturated power amplifier (SPA) with a distributed second harmonic termination supporting multi-band/multi-mode operation. Due to the multiple harmonic terminations, the proposed PA improves the frequency range where the PA can achieve a high efficiency.
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Design
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01 Sep 2010
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by Sebastian Preis; Daniel Gruner; Georg Boeck
The class-B/J mode continuum in power amplifiers (PAs) defined at the current source plane is discussed considering different parasitic elements including C DS as well as the package. Based on this realistic device description the change of the continuous load impedances depending on the reference plane is demonstrated. It is shown that the design flexibility predicted by the continuous mode theory decreases if the transistor package is taken into account. The presented investigations provide the basis for the design of a broadband GaN PA.
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Design
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01 Jun 2012
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by Donald A. Gajewski, Scott Sheppard, Tina McNulty, Jeff B. Barner, Jim Milligan and John Palmour
This paper reports the reliability performance of the Cree, Inc., GaN/AlGaN HEMT MMIC process technology, fabricated on 100 mm high purity semi-insulating (HPSI) 4H-SiC substrates.
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Design
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01 May 2011
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by Ivan Boshnakov, Anna Wood, Simon Taylor
In the world of RF and microwave engineering, the design and development of solid-state amplifiers is a specialty. It has always required many years of specialized engineering experience and a suitable collection of test and measurement equipment. While these will always be necessary, to be successful in the marketplace today, it is also essential to use a combination of specialized and general CAD tools.
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Design
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01 Apr 2012
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by Ivan Boshnakov; Anna Wood; Simon Taylor
In the world of RF and microwave engineering, the design and development of solid-state amplifiers is a specialty. It has always required many years of specialized engineering
experience and a suitable collection of test and measurement equipment. While these will always be necessary, to be successful in the marketplace today, it is also essential to use a combination of specialized and general CAD tools.
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Design
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01 Apr 2012
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by Ivan Boshnakov; Anna Wood; Simon Taylor
In the world of RF and microwave engineering, the design and development of solid-state amplifiers is a specialty. It has always required many years of specialized engineering experience and a suitable collection of test and measurement equipment. While these will always be necessary, to be successful in the marketplace today, it is also essential to use a combination of specialized and general CAD tools.
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Design
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01 Jul 2012
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by Ildu Kim, Jangheon Kim, Junghwan Moon, Jungjoon Kim, and Bumman Kim
Demonstrating a highly efficient Hybrid Envelope Elimination and Restoration transmitter for IEEE 802.16e Mobile WiMAX applications using a highly efficient saturated Power Amplifier (PA). For the optimum H-EER operation, the PA has been designed to have a maximum PAE at the average Vds region by using 10 W (P3dB ) GaN High Electron Mobility Transistor.
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Design
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01 Jun 2009
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by Khaled Bathic; Georg Boeck
This paper presents the design of a wideband harmonically-tuned Doherty amplifier. The frequency-dependent back-off efficiency degradation was minimized by compensating the effect of the frequency-sensitive impedance inverters over the design band. Suitable choice of device size ratio as well as harmonic load tuning at back-off and maximum power operations were also considered, resulting in superior performance over the targeted design band.
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Design
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01 Jun 2012
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