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110 Chapter 7
Phase Noise Measurement Application
General Specifications
Description Specifications Supplemental Information
Amplitude Repeatability
Standard Deviation
a
b
a. Amplitude repeatability is the nominal standard deviation of the measured phase noise. This table
comes from an observation of 30 log plot measurements using a 1 GHz, 0 dBm signal with the smooth-
ing settings shown. All other analyzer and measurement settings are set to their factory defaults.
b. The standard deviation can be further reduced by applying averaging. The standard deviation will
improve by a factor of the square root of the number of averages. For example, 10 averages will
improve the standard deviation by a factor of 3.2.
No Smoothing
Offset
100 Hz 3.2 dB
1 kHz 2.0 dB
10 kHz 1.7 dB
100 kHz 1.6 dB
1 MHz 1.2 dB
4
% Smoothing
c
c. Smoothing can cause additional amplitude errors near rapid transitions of the data, such as with discrete
spurious signals and impulsive noise. The effect is more pronounced as the number of points smoothed
increases.
Offset
100 Hz 1.2 dB
1 kHz 0.56 dB
10 kHz 0.42 dB
100 kHz 0.42 dB
1 MHz 0.42 dB