User`s guide

Residual Measurement Fundamentals 7
Agilent E5505A User’s Guide 223
2
Measure the power level that will be applied to the signal input port of the
test set’s phase detector. Table 34 shows the acceptable amplitude ranges
for the E5505A system phase detectors.
3 Using the RF spectrum analyzer or modulation analyzer, measure the
carrier-to-sideband ratio of the phase modulation at the phase detector’s
modulated port and the modulation frequency. The audio calibration
source should be adjusted such that the sidebands are between –30 and
–60 dB below the carrier and the audio frequency is between 50 Hz and 50
MHz. See Figure 158.
Table 34 Acceptable amplitude ranges for the phase detectors
Phase Detector
50 kHz to 1.6 GHz 1.2 to 26.5 GHz
1
1 Phase noise test set options 001 and 201
Ref Input (L Port) Signal Input (R Port) Ref Input (L Port) Signal Input (R Port)
+ 15 dBm
to
+ 23 dBm
0 dBm
to
+ 23 dBm
+ 7 dBm
to
+ 10 dBm
0 dBm
to
+ 5 dBm
Figure 158 Measuring carrier-to-sideband ratio of the modulated port
Power
splitter Phase
detector
Source
Audio
calibration
source
-10 dB
attenuator
E5505a_meas_ratio_mod_port
01 Mar 04 rev 1
Optional line
stretcher
Phase
modulator
Test set
Signal
input
Ref input
10 kHz
-40 dBc
RF spectrum
analyzer
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