NDLI: Multitone Feedback Through Demodulating Log Detector for Detection of Spurious Emissions in Software Radio

Content Provider	IEEE Xplore Digital Library
Author	Simoneau, J.B. Pearson, L.W.
Copyright Year	2004
Abstract	This paper provides an analysis of a log detector in order to determine its response to a multitone input for detection of spurious emissions in a radio frequency transmitter. Treatment is given to the single tone response of the log detector and extended to a two-tone log detector system, where a large signal and a small signal are present. The large signal is observed to experience logarithmic processing with an output at zero frequency. The small signal produces an output at the difference frequency of the large signal frequency and small signal frequency that is approximately proportional to the ratio of the small signal voltage to the large signal voltage. The two-tone results are generalized to an m-tone input. Experimental results are presented to show the accuracy of the model. The log detector circuit analyzed is able to detect a spurious emission within 45 MHz of the main signal with plusmn1 dB of accuracy.
Sponsorship	IEEE Circuits and Systems Society
Starting Page	2222
Ending Page	2228
Page Count	7
File Size	390303
File Format	PDF
ISSN	15498328
Volume Number	54
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Feedback Detectors Software radio Radio frequency Filters Hardware Frequency conversion Signal processing Voltage Data conversion spectral analysis Logarithmic amplifiers microwave radio RF detectors
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Hardware and Architecture

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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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