Concepts and features
R&S
®
ZNA
289User Manual 1178.6462.02 ─ 29
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Controlled timing is limited to setups with a single channel.
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Controlled timing is not compatible with:
– ALC
– spectrum measurements
– two-dimensional compression point measurements
– phase coherent and true differential signal generation
– external devices control via USB or LAN (power meters, generators)
– RFFE usage
4.7.11 Noise figure measurement
Option R&S ZNA-K30
Software option R&S ZNA-K30 allows you to measure the noise figure of a 2-port DUT,
operating in its linear range.
4.7.11.1 Introduction
Noise figure (or noise factor, if the linear representation is chosen) is an important fig-
ure of merit for system designers and eventually determines the overall system perfor-
mance of a receiver.
Figure 4-27: Exemplary spectrum for a single tone excitation (left = DUT input; right = DUT output)
The general definition of the noise factor F
D
is the ratio of the signal to noise ratio
(SNR) at the input, to the SNR at the output of a DUT. In other words, it describes the
degradation of the SNR from the input to the output of a DUT.
Figure 4-28: Schematic showing the signal and noise powers relevant for noise figure calculations
Based on this formulation the equation can be written in linear terms as:
Optional extensions and accessories
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