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Table 35 Acceptable Amplitude Ranges for the Phase Detectors
Phase Detector
50 kHz to 1.6 GHz
Ref Input (L Port)
+
15 dBm
to
+
23 dBm
1 Phase noise test set options 001 and 201
3
Source
Calibration
source
Figure 160 Carrier-to-spur ratio of modulated signal
4
Agilent E5505A User's Guide
Signal Input (R Port)
0 dBm
to
+
23 dBm
Measure the carrier-to-single-sided-spur ratio out of the coupler at the
phase detector's modulated port and the offset frequency with the RF
spectrum analyzer
(Figure
adjusted such that the sidebands are between –30 and –60 dB below the
carrier and the frequency offset of the spur between 10 Hz and 50 MHz.
Optional line
Power
splitter
output
-10 dB
attenuator
Measure the carrier-to-spur ratio of the non-modulated side of the phase
detector
(Figure 161
on page 224). It must be at least 20 dB less than the
spur ratio of the modulated port. This level is necessary to prevent
cancellation of the modulation in the phase detector. Cancellation would
result in a smaller phase detector constant, or a measured noise level that is
worse than the actual performance. The isolation level is set by the
port-to-port isolation of the power splitter and the isolation of the –20 dB
coupler. This isolation can be improved at the expense of signal level by
adding an attenuator between the coupler and the power splitter.
Residual Measurement Fundamentals
1.2 to 26.5 GHz
Ref Input (L Port)
+
7 dBm
to
+
10 dBm
160). The RF calibration source should be
stretcher
Signal
input
-20 dB
coupler
input
Ref input
Coupler
port
1
Signal Input (R Port)
0 dBm
to
+
5 dBm
Test set
Phase
detector
E5505a_carrier_spur_ratio
01 Mar 04 rev 1
7
223
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