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Advanced Software Features
16
Phase Lock Loop Suppression
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 3048A System noise floor
exclusive of the reference source. VCO CONSTANT: This 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.
Document Part No. E5500-90024Ed. 1.0
E5500 Phase Noise Measurement System Version A.02.00
16-5
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