GUI reference
R&S
®
ZNA
375User Manual 1178.6462.02 ─ 29
Sideband Correction ← Advanced Settings
In this section of the "Advanced NF Settings" dialog, you can compensate for the
imperfect response of the VNA receivers. See "Sideband correction" on page 293 for a
detailed description. However, the overall influence on the calculated NF does not only
depend on the receivers but also on the DUT. Therefore, depending on the DUT, it can
be advantageous to choose a higher sideband order and a higher upper frequency limit
as chosen by default.
A general recommendation is to choose a 5th order sideband correction for frequen-
cies starting below 1 GHz. For higher frequencies, the sideband order can be reduced.
For frequencies starting above 20 GHz, the effect of parasitic sidebands is typically
negligible.
Example 1: A broadband amplifier with a positive gain ranging from 500 MHz to 6 GHz
typically requires sideband correction during a precise NF measurement. For such an
amplifier, several higher-order sidebands of the VNA receiver are within its gain band-
width. At a measurement frequency of 500 MHz, for example, the sidebands of the
VNA receiver are at 1 GHz, 1.5 GHz, 2 GHz. These bands are within the gain band-
width of the amplifier and therefore require sideband correction. Since the DUT does
not have any gain above 6 GHz, the upper frequency of the sideband correction can be
set close to this value (e.g. 7 GHz).
Example 2: A narrowband amplifier with a positive gain ranging from 2.3 GHz to
2.6 GHz typically requires no sideband correction for a precise NF measurement. For
such an amplifier, the sidebands of the VNA receiver (4.6 GHz to 5.2 GHz for the 2nd
sideband, 6.9 GHz to 7.8 GHz for the 3rd sideband) are not within its gain bandwidth.
Note: The sideband order can be decreased after calibration. This allows you to inves-
tigate the effect of the parasitic sidebands, and to increase the measurement speed,
since less additional measurements are required.
Remote command:
[SENSe<Ch>:]NFIGure:HARMonic[:STATe]
[SENSe<Ch>:]NFIGure:HARMonic[:MINFrequency]
[SENSe<Ch>:]NFIGure:HARMonic[:MAXFrequency]
[SENSe<Ch>:]NFIGure:HARMonic[:MAXimumorder]
DUT Correction ← Advanced Settings
Image band correction is only available for frequency converting DUTs. Using this func-
tion requires additional measurement to determine the gain and source noise tempera-
ture at the image band. The additional measurements are automatically carried out
during calibration and measurement. See "Frequency-converting DUTs" on page 293
for details.
Remote command:
[SENSe<Ch>:]NFIGure:RFICorr
Calibration Settings
Opens the calibration setup dialog and activates its "Noise Figure tab" on page 594,
where you can adjust calibration settings such as power levels and detector times.
Meas softtool
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