NDLI: Amplitude-modulation detection in single-stage negative-feedback amplifiers due to interfering out-of-band signals

Content Provider	IEEE Xplore Digital Library
Author	van der Horst, M.J. Linnenbank, A.C. van Staveren, A.
Copyright Year	1964
Abstract	The electromagnetic-interference effects of out-of-band signals on negative-feedback amplifiers are investigated. It is assumed that the interfering signals picked up at the input of the amplifier are dominant. Due to the nonlinear behavior of the active devices in the amplifier, unwanted dc shifts and amplitude-modulation (AM) detection may occur. Describing these effects is usually done by using the Volterra series. Although providing good results when used for analysis, methods to use the Volterra series for the design process are not yet mature enough. A simple procedure for calculating AM detection is presented. An equivalent source at the input of the amplifier is introduced that accounts for the nonlinear effects. Because the characteristics of this source are computed as a function of design parameters, this procedure facilitates a synthesis approach for designing amplifiers with a lower susceptibility to AM detection. It is shown that the root locus of the amplifier transfer function has a large influence on the amount of AM detection and, therefore, on the electromagnetic compatibility. Measurements made on a single-stage negative-feedback amplifier support the presented procedure.
Sponsorship	IEEE Electromagnetic Compatibility Society
Starting Page	34
Ending Page	44
Page Count	11
File Size	534937
File Format	PDF
ISSN	00189375
Volume Number	47
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Amplitude modulation Electromagnetic interference Feedback amplifiers Electromagnetic compatibility Demodulation Transfer functions nonlinearity Amplitude-modulation (AM) detection electromagnetic interference (EMI) equivalent signal source negative-feedback amplifier
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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