Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Modulator/demodulator
Patent
1990-06-26
1992-01-21
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Modulator/demodulator
324115, 324616, 324611, G01R 2104, G01R 1924, G01R 1918
Patent
active
050830805
ABSTRACT:
A signal detector includes a signal input section, a detector, and a converter. The signal input section inputs a high frequency signal to be measured. The detector detects the high frequency signal to be measured input by the signal input section. The converter amplifies the output from the detector and includes a variable gain preamplifier which has a first gain higher than a linear gain when the detecting output is smaller than a predetermined value and a second gain lower than the linear gain when the detecting output is larger than the predetermined value. A cable line transmits an output from the variable gain preamplifier of the converter of the signal detector. A measuring equipment body includes a decoder and an analyzer. The decoder amplifies an output from the variable gain preamplifier transmitted by the cable line and includes a variable gain main amplifier which has a first gain lower than a linear gain when an output from the variable gain preamplifier is smaller than a predetermined value and a second gain higher than a linear gain when the output from the variable gain preamplifier is larger than the predetermined value. The analyzer performs predetermined signal analysis for an output amplified by the variable gain main amplifier of the decoder.
REFERENCES:
patent: 3041535 (1962-06-01), Cochran
patent: 3213391 (1965-10-01), Kovalevski
patent: 3969680 (1976-07-01), Wermuth
patent: 4123711 (1978-10-01), Chow
patent: 4341994 (1982-07-01), Kawasaki
patent: 4628256 (1986-12-01), Powell
patent: 4647845 (1987-03-01), Richter
Oliver: "Electronic Measurements and Instrumentation", McGraw Hill-1972-p. 599.
Anritsu Corporation
Solis Jose M.
Wieder Kenneth A.
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