Keysight Technologies E8740A-060, Руководство для стартапов

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12 Keysight E8740A-060 Start-up Guide
Effect of software pre-selector
The following steps test shows the ability of the proprietary algorithm of the
software pre-selector to remove unnecessary images and spurious caused by the
mixing process at millimeter wave frequencies from a stable signal. The N9041B
is capable of very low noise floor, close to -150dBm/Hz above 50 GHz. This is
made possible by use of a software pre-selector which avoids adding additional
noise unlike a physical pre-selector.
Step Action Notes
1 Turn on radar source. a Connect the radar source to the RF2
port as shown in Figure . Observe the
spectrum as in Figure .
b If the RF power at RF2 exceeds the
compression level of the mixer, the
input attenuator needs to be turned
on. See step 4 of “Viewing the noise
floor of the N9041B” on page 9.
For the purpose of this guide, a periodic
(T = 2 m s) Frequency Modulated
Continuous Wave (FMCW) was
generated.
The center frequency is 79 GHz and the
bandwidth is 4 GHz. The total power of
the signal is about -37 dBm.
Figure 2 Connect radar signal to RF2 port