Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1985-05-15
1988-01-19
Tokar, Michael J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
455325, G01R 2316
Patent
active
047206730
ABSTRACT:
The spectrum analyzer comprises an input for receiving electromagnetic signals in a predetermined first frequency band and an image reject mixer for reducing the power of images of the received signals while down-converting the signals to an intermediate frequency. The image reject mixer reduces the signal power level to approximately that of the background noise of the signal. The mixer is swept through a predetermined frequency band in order to down-convert each frequency in the received signal band individually. The down-converted signals are logarithmically compressed using a multi-stage logarithmic compression circuit having variable gain amplifiers in each stage.
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patent: 4545073 (1985-10-01), Dixon, Jr.
"Poor Man's Spectrum Analyzer", 73 Magazine, Aug. 1982, by Frank H. Perkins.
Avcom of Virginia, Inc.
Tokar Michael J.
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