Agilent Technologies HP 8642A/B Dokumentacja Strona 126

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Calibration for the Phase Noise Without Using
a PLL Measurement
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Introduction
Calibration of the "Phase Noise Without Using a PLL" measurement type
involves calibration of the Phase Detector Constant. The Phase Detector
Constant is the sensitivity of the phase detector expressed in V/Rad. The
noise floor (or the maximum sensitivity of the system) is set by the Phase
Detector Constant.
The phase detector translates phase fluctuations to voltage fluctuations.
The amplitude of the phase detector's voltage output is proportional to the
phase fluctuations at its input and its sensitivity. The detector's sensitivity
is a function of the power levels at its input. The Phase Detector Constant
determines the absolute noise floor of the system.
Calibr Process: $N w/o PLL 2-57
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