NDLI: Highly efficient envelope tracking transmitter by utilizing sinking current

Content Provider	IEEE Xplore Digital Library
Author	Jungjoon Kim Junghwan Moon Junghwan Son Seunghoon Jee Juyeon Lee Jeonghyeon Cha Ildu Kim Bumman Kim
Copyright Year	2011
Description	Author affiliation: Department of Electrical Engineering and Division of Information Technology Convergence Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Nam-gu, Pohang, Gyeongbuk, 790-784, Republic of Korea (Jungjoon Kim; Junghwan Moon; Junghwan Son; Seunghoon Jee; Juyeon Lee; Bumman Kim) \|\| Network Division, Samsung Electronics Co., Ltd., Suwon, Gyeonggi, 443-742, Republic of Korea (Jeonghyeon Cha; Ildu Kim)
Abstract	This paper presents an envelope shaping function of the hybrid switching amplifier (HSA) to achieve high efficiency. In the envelope tracking (ET) transmitter, the switch current of HSA can not follow the wideband load current due to limitation of the switching frequency. Thus, the switch operates as a quasi-constant current source and the sourcing and the sinking currents of the linear stage generates the accurate load current. The sinking current is a critical efficiency reduction factor since it is a wasted power. To reduce the sinking current, the gate bias of the PA should be increased, so that the sinking current is delivered to the PA and is utilized for amplification. The efficiency of the HSA can be increased over 80% from around 70%. The implemented ET transmitter using Cree CGH40045 GaN HEMT achieves drain efficiency of 59.1% at 40.3 dBm output power for long term evolution 10-MHz signal with 6.5 dB PAPR at 889MHz. Moreover, the ET transmitter could be linearized to −45 dBc with using the digital predistortion technique.
Starting Page	636
Ending Page	639
File Size	415914
Page Count	4
File Format	PDF
ISBN	9781612842363
e-ISBN	9782874870231
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-10-10
Publisher Place	United Kingdom
Access Restriction	Subscribed
Rights Holder	EUROPEAN MICROWAVE ASSOC
Subject Keyword	Transmitters Modulation Switches Peak to average power ratio Logic gates Power generation Gain
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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