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12
AM Noise Measurement Fundamentals
Method 3: Single-Sided-Spur
12-20
E5500 Phase Noise Measurement System Version A.02.00
3
Measure the carrier-to-single-sided-spur ratio and the spur offset
at the input to the AM detector with an RF spectrum analyzer.
See
Figure
12-19. The spur should be adjusted such that it is
between –30 and –60 dBc, with a carrier offset of 10 Hz to 20
MHz.
Figure 12-19Measuring Relative Spur Level
4
Reconnect the AM detector and measure the detector sensitivity.
See
Figure
12-20.
Figure 12-20Measuring Detector Sensitivity
5
Turn off the spur source output.
6
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.
Document Part No. E5500-90024 Ed. 1.0
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