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11
AM Noise Measurement Fundamentals
Method 2, example 2
Advantages
• Will measure source without modulation capability
• Calibration is done under actual measurement conditions so all
Disadvantages
• Requires a second RF source with very accurate AM modulation and output
Procedure
1
DUT
E5505a_noise_sys_block
01 Mar 04 rev 1
Figure 230 Double-sided spur AM noise setup (method 2, example 2)
2
DUT
E5505a_pwr_am_detector
02 Mar 04 rev 1
Figure 231 Measuring power at the am detector
296
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.
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.
Connect circuit as shown in
N5500A Option 001 or N5507A is available, use one of the connection
diagrams described in
page
285.
AM detector
Measure the power which will be applied to the AM detector
must be between 0 and +23 dBm.
Power meter
or RF spectrum
analyzer
Figure
230, and tighten all connections. If the
"AM noise measurement block diagrams"
Test set
Noise
input
on
(Figure
231). It
Agilent E5505A User's Guide
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