NDLI: Automatic control of constant highly reflective loads in active load-pull systems for the characterization of compression effects and IM3 in SSPAs

Content Provider	IEEE Xplore Digital Library
Author	Coupot, J.M. Blanche, F. Narbonne, Y. Bouysse, J.M. Nebus Ph. Villolte, J.P.
Copyright Year	1993
Description	Author affiliation: IRCOM-Faculté des Sciences - URA CNRS n° 356 123, Avenue, Albert-Thomas 87060 LIMOGES Cédex (Coupot, J.M.; Blanche, F.; Narbonne, Y.; Bouysse, J.M. Nebus Ph.; Villolte, J.P.)
Abstract	Optimization of trade-offs between power added efficiency and third order intermodulation (IM3) in transistors is the most critical point encountered in the design of communication power amplifiers. Power transistors are generally highly mismatched components. The characterization of such devices by load-pull techniques is a very difficult task. We have recently proposed a solution to this problem. It consists in using appropriate mismatched power sources to drive the device under test (DUT) during the measurement process [1]. Prediction of IM3 can be achieved by computing the measured single tone complex gain of the DUT for any load impedance of interest. Nevertheless, in active load-pull systems the load impedance doesn't remain constant when the power level driving the input of the DUT varies. Therefore, it is necessary to compute measurement data files in order to extract the complex envelope gain function of the DUT. The modified active load-pull set-up proposed in this paper allows the control of any constant load impedance of interest. Any desired load impedance is automatically kept constant independently of the input driving signal of the DUT. In consequence, complex gain can be directly extracted from measurements and IM3 quickly predicted.
Starting Page	853
Ending Page	856
File Size	3541166
Page Count	4
File Format	PDF
DOI	10.1109/EUMA.1993.336728
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-09-06
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Automatic control Reflection Power amplifiers Power measurement Gain measurement Couplers Frequency Impedance measurement Data mining Data processing
Content Type	Text
Resource Type	Article

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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
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