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Document Part No. E5500-90024Ed. 1.0
3
Measure the carrier-to-sideband ratio of the AM at the AM
detector's input with an RF spectrum analyzer or modulation
analyzer
(Figure
12-12). The source should be adjusted such that
the sidebands are between –30 and –60 dB below the carrier with
a modulation rate between 10 Hz and 20 MHz.
NOTE:
The carrier-to-sideband ratio
æ
ö
percentAM
C
----------------------------- -
---- -
=
20
log
è
ø
100
sb
Figure 12-12Measuring the Carrier-to-Sideband Ratio
4
Reconnect the AM detector and enter the carrier-to-sideband
ratio and modulation frequency.
5
Measure the AM detector calibration constant
Figure 12-13Measuring the Calibration Constant
E5500 Phase Noise Measurement System Version A.02.00
AM Noise Measurement Fundamentals
Method 2: Double-Sided Spur
C
for AM is:
-----
sb
=
6dB
12
(Figure
12-13).
12-15
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