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15
Advanced Software Features
Detector constant
This is the phase Detector Constant (sensitivity of the phase detector) used for
the measurement. The accuracy of the Phase Detector Constant is verified if
the PLL suppression is verified. The accuracy of the phase Detector Constant
determines the accuracy of the noise measurement.
The phase Detector Constant value, along with the LNA In/Out parameter,
determines the Agilent E5505A system noise floor, exclusive of the reference
source. "VCO CONSTANT" is the VCO Tune Constant used for the
measurement. The accuracy of the VCO Tune Constant determines the
accuracy of the PLL noise measurement for offset frequencies in segments
where the entire plotted frequency range is less than the PLL BW / 4. The
accuracy of the VCO Tune Constant is verified if the PLL Suppression is
verified. The VCO Tune Constant times the Tune Range of VCO determines the
Peak Tune Range (PTR) value for the measurement. The PTR sets the drift
tracking and close-in noise suppression capabilities of the test system.
Agilent E5505A User's Guide
345
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