Keysight Technologies N9040B UXA Manual page 53

Measurement Related Tasks and Concepts
Setting the Measurement System
Figure 3-2 Single Sideband Mixer Measurements
Amplitude
Figure 3-2
filter makes it single sideband. If the IF frequency is lowered, the analyzer is
tuned to a lower frequency, and the USB and LSB bands will move closer to
the LO frequency. This makes filtering more difficult. If the IF is lowered further,
a point is reached where filtering is not possible and SSB measurements
cannot be made. The width of the filter limits where the LO or IF frequencies
sweep to make a measurement.
The analyzer performs frequency calculations and controls the frequency for a
variety of mixer modes. However, you have to determine the filter
requirements, and provide those filters in the measurement setup.
'Downconverter' means that the output frequency, (IF) is lower than the input,
(RF).
'Upconverter' means that the output frequency, (IF) is higher than the input
(RF).
This is the convention used in this analyzer. Some engineering terms use
reversed terms for upconverters.
The analyzer can handle SSB mixer measurements in modes defined by the
following combinational choices:
— DUT: Upconverter, Downconverter, or Amplifier with System
— Sideband: LSB or USB.
N9069C Noise Figure Measurement Guide
F -F
lo lsb
mixing
Noise reaching mixer from
the DUT Input filter
X-Series Input
Band
shows an SSB mixer measurement (Downconverter, LSB) where a
Downconverter On.
F
LO
LSB Input
(Filtered)
Depending on F , a DUT
lo
output filter may be needed
to reject LO leakage
Frequency
USB Input
53