Rohde & Schwarz FSW-K40 - Measurement Range

Measurement Basics
R&S
®
FSW-K40
24User Manual 1173.9286.02 ─ 15
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.
 
[Hz]frequency
[dBc/Hz] noise phase sideband single with
FM Residual




m
m
f
f
mmm
f
fL
HzdffLf
stop
start
)(
)(2
2
Jitter
The jitter is the RMS temporal fluctuation of a carrier with the given phase noise evalu-
ated over a given frequency range of interest.
frequency Carrier with
[rad]ResidualPM
Jitter[s]



0
0
2
f
f 
Figure 4-2: Residual noise based on an integration between 10 kHz and 100 kHz offset
4.3 Measurement Range
Noise measurements determine the noise characteristics of a DUT over a particular
measurement range. This measurement range is defined by two offset frequencies.
The frequency offsets themselves are relative to the nominal frequency of the DUT.
Measurement Range