Apparatus for measuring noise factor and available gain
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United States of America Patent
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Jan 1, 1985
Grant Date -
N/A
app pub date -
Apr 22, 1982
filing date -
Apr 25, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a noise factor and available gain measuring apparatus in which a first noise source is connected to a first port of a circulator through a device under test, a second noise source is connected to a third port of the circulator, and the second port of the circulator is connected to a noise measuring circuit through a variable attenuator. In the apparatus, the noise factor and available gain of the device under test are separately evaluated on the basis of a plurality of overall noise factors measured with parameters of an excess noise ratio of the second noise generator and a noise factor of a noise measuring circuit containing the variable attenuator.
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