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Measured +/- DC Peak
Voltage
Advantages:
•
Easy method for calibrating the measurement system.
•
This calibration technique can be performed using the baseband
analyzer.
•
Fastest method of calibration. If, for example, the same power levels are
always at the phase detector, as in the case of leveled, or limited outputs,
the phase detector sensitivity will always be essentially equivalent
(within one or two dB). Recalibration becomes unnecessary if this
accuracy is adequate.
•
Only one RF source is required.
•
Measures the phase detector gain in the actual measurement
configuration. This technique requires you to adjust off of quadrature to
both the positive and the negative peak output of the Phase Detector.
This is done by either adjusting the phase shifter or the frequency of the
source. An oscilloscope or voltmeter can optionally be used for setting
the positive and negative peaks.
Disadvantages:
•
Has only moderate accuracy compared to the other calibration methods.
•
Does not take into account the amount of phase detector harmonic
distortion relative to the measured phase detector gain, hence the phase
detector must operate in its linear region.
•
Requires manual adjustments to the source and/or phase shifter to find
the phase detector's positive and negative output peaks. The system will
read the value of the positive and negative peak and automatically
calculate the mean of the peak voltages which is the phase detector
constant used by the system.
Procedure
1. Connect circuit as per
connections.
2. Measure the power level that will be applied to the Signal Input port of
the Agilent/HP 70420A's Phase Detector. The following chart shows the
acceptable amplitude ranges for the Agilent/HP 70420A Phase
Detectors.
Agilent Technologies E5500 Phase Noise Measurement System 8-13
Residual Measurement Fundamentals
The Calibration Options
Figure 8-9 on page
8-14, and tighten all
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