R&S FSL Noise Figure Measurements Option (K30)
1300.2519.12 2.105 E-11
freq.
LORFIFImage
If a DUT, which equally converts the useful signal and the image to the IF frequency, is measured using
the conventional y factor method or with the 2nd stage correction switched on, a measuring error of 3
dB is produced. The noise figure is displayed 3 dB lower and the gain 3 dB higher. The following
examples help to configure the test setup in order to measure the actual values.
Measurement on a single–sideband mixer
freq.
LORFIF
In general, a single–sideband mixer with a very high image rejection causes very few problems. The
measurement is analogous to an amplifier. In this case, set the image rejection in the Frequency
Settings dialog box to a large value (e.g. 999.99 dB).
Measurement on a mixer without sideband suppression
freq.
LORFIFImage
If the input and image frequencies are converted with the same application, an error of 3 dB occurs in
the measurement results if the image rejection is not taken into account. In this case, set the image
rejection in the Frequency Settings dialog box to a small value (e.g. 0.0 dB).
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