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11
AM Noise Measurement Fundamentals
Calibration
source
Figure 235 Measuring relative spur level
4
Calibration
source
Figure 236 Measuring detector sensitivity
5
6
The quadrature meter should be at zero volts due to the blocking capacitor at the AM
NO T E
detector's output.
300
page 300. The spur should be adjusted such that it is between –30 and –60
dBc, with a carrier offset of 10 Hz to 20 MHz.
-20 dB coupler
DUT
-10 dB
atten
Reconnect the AM detector and measure the detector sensitivity. See
Figure
236.
DUT
-10 dB
attenuator
Turn off the spur source output.
Measure noise data and interpret the results.
RF spectrum
analyzer
E5505a_meas_relative_spur
02 Mar 04 rev 1
AM detector
-20 dB
coupler
Test set
Noise
input
E5505a_meas_detector_sen
02 Mar 04 rev 1
Agilent E5505A User's Guide
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