180 N5511A Phase Noise Test System User’s Guide
Residual and Additive Noise Measurement Fundamentals
Calibrating the Measurement
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.
Summary of Contents for N5511A
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