Method 2: Double-Sided Spur - Agilent Technologies E5500A User Manual

12 AM Noise Measurement Fundamentals

Method 2: Double-Sided Spur

Method 2: Double-Sided Spur
Method 2, Example 1
12-14 E5500 Phase Noise Measurement System Version A.02.00
Advantages
G
Requires only one RF source (DUT)
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 Required that the DUT have adjustable AM which may also be
turned off.
G Requires the AM of the DUT to be extremely accurate; otherwise
a modulation analyzer, for manual measurement of AM sidebands
is required.
Procedure
1 Connect circuit as shown in
connections. If the Agilent 70420A Option 001 or Agilent 70427A
is available, use one of the connection diagrams described in
Noise Measurement Block Diagrams"
Figure 12-11Double-sided Spur AM Noise Measurement Setup Method 1,
Example 1
2 Measure the power which will be applied to the AM detector. It
must be between 0 and +23 dBm.
Figure 12-11, and tighten all
on page 12-3.
Document Part No. E5500-90024 Ed. 1.0
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