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|5989-0270EN.pdf||Non-Zero Noise Figure After Calibration
Application Note 1484
The increasing demand for wireless products combined with the availability
of modern easy-to-use measurement equipment mean that noise figure
measurements are more popular than ever. This is especially true in the
microwave region of the spectrum where more and more wireless standards
are being developed.
Noise figure measurements rely on a calibrated noise source as a reference.
The general measurement process is shown in the figures below. In Figure 1, the
noise source is connected directly to the input of the measuring instrument
and a user calibration is performed. This measures and stores the instrument's
own noise figure at its various attenuator settings. These results are used to
remove the effect of "second-stage" noise contribution during a corrected
measurement. The measurement arrangement, with the device-under-test (DUT)
inserted between the noise source and the instrument is shown in Figure 2.
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