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Document Part No. E5500-90024Ed. 1.0
The system's peak tuning range is derived from the tuning
characteristics of the VCO source you are using for the measurement.
Figure 6-2
illustrates the relationship that typically exists between
the VCO's peak-to-peak tuning range and the tuning range of the
system.
The system's drift tracking range is limited to a small portion of the
peak tuning range to minimize the possibility of measurement
accuracy degradation caused by non-linearity across the VCO's
tuning range.
Peak Tune Range (PTR)
PTR is determined using two parameters:
G
VCO tuning sensitivity (Hz/Volt)
G
Total voltage tuning range (Volts)
PTR = (VCO Tuning Sensitivity) X (Total Voltage Tuning Range)
PTR = (100 Hz/V) X (10 V) = 1000 Hz
Figure 6-2 Typical Relationship of Capture Range and Drift Tracking Range to
Tuning Range of VCO
As an Example:
A Peak Tuning Range of 1000 Hz will provide the following ranges:
Capture Range = 0.05 X 1000 Hz = 50 Hz
Drift Tracking Range = 0.24 X 1000 Hz = 240 Hz
E5500 Phase Noise Measurement System Version A.02.00
Absolute Measurement Fundamentals
The Phase Lock Loop Technique
6
6-3
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