Method 2, Example 2 - Agilent Technologies E5500A User Manual

Method 2, Example 2

Figure 12-14
Figure 12-15
AM Noise Measurement Fundamentals
Method 2: Double-Sided Spur
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
the Agilent/HP 70420A Option 001 or Agilent/HP 70427A is available,
use one of the connection diagrams described in
Measurement Block Diagrams" on page
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
between 0 and +23 dBm.
Measuring Power at the AM Detector
12-14 Agilent Technologies E5500 Phase Noise Measurement System
Figure 12-14, and tighten all connections. If
"AM Noise
12-3.