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Method 3: Single-Sided Spur
Advantages
• Will measure source without modulation capability.
• Calibration is done under actual measurement conditions so all
Disadvantages
• Requires 2 RF sources, which must be between 10 Hz and 40 MHz apart in
• Requires an RF spectrum analyzer for manual measurement of the
Procedure
1
Figure 234 AM noise measurement setup using single-sided spur
2
3
Agilent E5505A User's Guide
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.
frequency.
signal-to-spur ratio and spur offset.
Connect circuit as shown in
N5500A Option 001 or N5507A is available, use one of the connection
diagrams described in
page
285.
-20 dB
DUT
coupler
-10 dB
attenuator
50Ω
Measure the power which will be applied to the AM detector. It must be
between 0 and +23 dBm.
Measure the carrier-to-single-sided-spur ratio and the spur offset at the
input to the AM detector with an RF spectrum analyzer. See
AM Noise Measurement Fundamentals
Figure
234, and tighten all connections. If the
"AM noise measurement block diagrams"
AM detector
on
Test set
Noise
input
E5505a_am_noise_meas_single
02 Mar 04 rev 1
Figure 235
11
on
299
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