NDLI: Methods for measuring the power linearity of microwave detectors for radiometric applications

Content Provider	IEEE Xplore Digital Library
Author	Reinhardt, V.S. Yi Chi Shih Toth, P.A. Reynolds, S.C. Berman, A.L.
Copyright Year	1963
Abstract	A microwave radiometer relies on the power linearity of its microwave receivers to accurately measure the temperature of remote microwave noise sources. This paper considers linearity issues in the design and characterization of such receivers. Analysis is presented relating the radiometer temperature interpolation error to a second order power nonlinearity coefficient for the receiver. Formulas are also developed specifying the temperature error in terms of individual receiver component parameters. It is shown that the key parameter for the RF detector in the receiver is A/sub 4/, a fourth order RF distortion coefficient, and the key parameter for the RF amplifiers in the receiver is IP/sub 3/, the third order intercept. This paper also discusses experimental methods for measuring the power linearity of RF detectors to the levels required for radiometric applications. Three methods are discussed: the two-tone method, the amplitude modulation method, and the constant ratio method. The theory of determining the coefficients that characterize the nonlinearity of the detector from experimental data is presented. Experimental results are presented showing that the two-tone method and the constant ratio method agree to within experimental error. The sensitivity for measuring nonlinearities and the difficulties encountered in implementing each of these methods are also discussed.<>
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	715
Ending Page	720
Page Count	6
File Size	567679
File Format	PDF
ISSN	00189480
Volume Number	43
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-04-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power measurement Microwave measurements Linearity Microwave theory and techniques Detectors Microwave radiometry Radio frequency Temperature measurement Noise measurement Interpolation
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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