R&S 1322.8003K06, User Manual

Page: 83 / 555

Measurements and Result Displays
R&S
®
FSPN
83 User Manual 1179.4363.02 ─ 01
5 Measurements and Result Displays
The noise performance of a DUT is usually described by various effects and signal
characteristics that can be measured by the R&S
FSPN.
The R&S FSPN provides several measurements, each of which analyzes different
noise characteristics for different types of signal.
All measurements support several result displays, each of which shows different
aspects of the noise characteristics of the measured signal.
● Basics on Phase Noise Measurements .................................................................. 83
● Performing Measurements ......................................................................................84
● Selecting Measurements .........................................................................................86
● Result Displays ....................................................................................................... 87
5.1 Basics on Phase Noise Measurements
● Residual Effects ...................................................................................................... 83
5.1.1 Residual Effects
Residual noise effects are modulation products that originate directly from the phase
noise. It is possible to deduct them mathematically from the phase noise of a DUT.
The application calculates three residual noise effects. All calculations are based on an
integration of the phase noise over a particular offset frequency range.
Residual PM
The residual phase modulation is the contribution of the phase noise to the output of a
PM demodulator. It is evaluated over the frequency range you have defined.
 
[dBc/Hz] noise phase sideband single with
PM Residual

 

) (
) ( 2
f L
rad df f L
stop
start
f
f
m m
Residual FM
The residual frequency modulation is the contribution of the phase noise to the output
of an FM demodulator. It is evaluated over the frequency range you have defined.
Basics on Phase Noise Measurements