
When the system measures the calibration spur, the analyzer does a
peak search over a frequency span of two times the entered spur offset
frequency. Once the spur has been located, the level of the spur is
measured and used to calculate the Phase Detector Constant. This method
compensates for both the non-linearity and harmonics of the phase
detector. (The HP 3048A will inform you when to remove the calibration
spurs.)
Considerations for the Derive From Single-Sided
Spur Method
Requires a RF Spectrum Analyzer capable of measuring the calibration
spur at the desired carrier frequency.
Calibration is performed under actual measurement setup conditions.
The non-linearity and harmonics of the phase detector are calibrated out.
The relative level (dBc) of the calibration spur must remain the same when
the system measures the amplitude of the spur as when the reference
measurement was made using the RF analyzer or modulation analyzer.
2-74 Calibr Process: $N w/o PLL
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