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12
AM Noise Measurement Fundamentals
Method 2: Double-Sided Spur
Method 2, Example 2
12-16
E5500 Phase Noise Measurement System Version A.02.00
6
Turn off AM.
7
Measure noise data and interpret the results.
NOTE: The quadrature meter should be at zero volts due to the
blocking capacitor at the AM detector's output.
Advantages
G
Will measure source without modulation capability
G
Calibration is done under actual measurement conditions so all
non-linearities and harmonics of the AM detector are calibrated
out. The double-sided spur method and the single-sided-spur
method are the two most accurate methods for this reason.
Disadvantages
G
Requires a second RF source with very accurate AM modulation
and output power sufficient to match the DUT. If the AM
modulation is not very accurate, a modulation analyzer must be
used to make manual measurement of the AM sidebands.
Document Part No. E5500-90024 Ed. 1.0
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