
The Peak Tuning Range determines the Drift Tracking Range (20% of
PTR),
and the PLL Capture Range (10% of PTR) for the measurement.
Peak Tuning Range (PTR) = Voltage Tuning Range
X VCO Tuning Constant
Min.
PTR = .1 Hz
Max. PTR = 500 kHz (200 MHz with
an RF Analyzer).
Drift Tracking Range = Allowable Drift During
Measurement.
Total Peak—to—Peak Tuning Range of VCO
System Peak Tuning Range (PTR)
Drift Tracking Range = +20% PTR
Capture
I Range = I
I ±10% PTR [
_L_
L.
VCO Source Center Frequency
Figure 2-7. Typical Relationship of Capture Range and
Drift Tracking Range to Tuning Range of the VCO Source
Determining the PTR Required for Drift Tracking
The following procedure will help you determine the PTR required to
provide adequate drift tracking.
1.
Observe or estimate the combined drift range of the sources.
Instr. Params: $N w/PLL 2-19
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