12-18
Agilent Technologies E5500 Phase Noise Measurement System
AM Noise Measurement Fundamentals
Method 3: Single-Sided-Spur
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. 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 12-19
Measuring Relative Spur Level
4. Reconnect the AM detector and measure the detector sensitivity.
Figure 12-20
Measuring 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.
