NDLI: Analysis of Far-Out Spurious Noise and its Reduction in Envelope-Tracking Power Amplifier

Content Provider	IEEE Xplore Digital Library
Author	Jooseung Kim Dongsu Kim Yunsung Cho Daehyun Kang Byungjoon Park Kyunghoon Moon Bumman Kim
Copyright Year	1963
Abstract	This paper describes analysis of the far-out spurious noise and a method to reduce this noise in an envelope-tracking power amplifier (ET PA). The ET PA delivers a higher efficiency and a better linearity than the stand-alone PA, simultaneously. However, the ET PA generates spectral regrowth at a far-out spurious emission domain. The noise sources are analyzed, and the noise effects on a RF PA are estimated using mathematical models of the RF PA and supply modulator. To reduce the noise, a wideband supply modulator is designed using 40-nm CMOS process for a high speed operation, and an additional capacitor is connected to the supply line of the PA. These noise reduction techniques significantly reduce the far-out spurious noise of the ET PA to a level similar to that of the stand-alone PA. For a 10-MHz bandwidth and 6.5-dB peak-to-average power ratio long term evolution signal, the ET PA delivers a power-added efficiency of 41.8%, a gain of 23.8 dB, and an evolved universal terrestrial radio access adjacent channel leakage ratio of -34.3 dBc at an average output power of 27 dBm and an operating frequency of 1.85 GHz. The noise power spectrum densities of the ET PA are -130.3/-133.7 dBm/Hz at 1.93/1.99 GHz, respectively, which is limited by our PA itself.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	4072
Ending Page	4082
Page Count	11
File Size	3368445
File Format	PDF
ISSN	00189480
Volume Number	63
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Regulators Switches Frequency modulation Mathematical model Distortion supply modulator Envelope-tracking far-out spurious noise long term evolution (LTE) power amplifier receiver band noise (RxBN)
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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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
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@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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