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Figure 8-5
Calibration and
Measurement
Guidelines
Residual Measurement Fundamentals
Calibrating the Measurement
Calibrating the Measurement
In the Agilent E5500 Phase Noise Measurement System, residual phase
noise measurements are made by selecting Residual Phase Noise (without
using a phase locked loop).
There are five calibration methods available for use when making residual
phase noise measurements. They are:
•
User Entry of Phase Detector Constant
•
Measured ±DC Peak
•
Beatnote
•
Φ
Double-Sided
M Spur
•
Single-Sided Spur
The method used will mainly be determined by the sources and equipment
available to you.
When calibrating the system for measurements, remember that the
calibration is only as accurate as the data input to the system software.
General Equipment Setup for Making Residual Phase Noise
Measurements
The following general guidelines should be considered when setting up and
making a residual two-port phase noise measurement.
1. For residual phase noise measurements, the source noise must be
correlated.
a. The phase delay difference in the paths between the power splitter
and the phase detector must be kept to a minimum when making
residual noise measurements. In other words, by keeping the cables
between the phase detector and power splitter short,
8-6 Agilent Technologies E5500 Phase Noise Measurement System
τ
will be small.
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