User`s guide

12-14 Agilent Technologies E5500 Phase Noise Measurement System
AM Noise Measurement Fundamentals
Method 2: Double-Sided Spur
Method 2, Example 2 Advantages
• Will measure source without modulation capability
• 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
• 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.
Procedure
1. Connect circuit as shown in Figure 12-14, and tighten all connections. If
the Agilent/HP 70420A Option 001 or Agilent/HP 70427A is available,
use one of the connection diagrams described in “AM Noise
Measurement Block Diagrams” on page 12-3.
Figure 12-14 Double-sided Spur AM Noise Measurement Setup Method 1, Example 2
2. Measure the power which will be applied to the AM detector. It must be
between0and+23dBm.
Figure 12-15 Measuring Power at the AM Detector