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8
Residual Measurement Fundamentals
Calibration Options
Table 8-7
Acceptable Amplitude Ranges for the Phase Detectors
Phase Detector
Ref Input (L Port)
Signal Input (R Port)
+
15 dBm
0 dBm
to
to
+
+
23 dBm
23 dBm
* Agilent 70420A Phase Noise Test Set Options 001 and 201
8-24
E5500 Phase Noise Measurement System Version A.02.00
Ref Input (L Port)
+
7 dBm
to
+
10 dBm
3
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
source should be 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.
Figure 8-17 Carrier-to-spur Ratio of Modulated Signal
4
Measure the carrier-to-spur ratio of the non-modulated side of
the phase detector
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
Signal Input (R Port)
0 dBm
to
+
5 dBm
(Figure
8-17). The RF calibration
(Figure
8-18). It must be at least 20 dB less
Document Part No. E5500-90024 Ed. 1.0
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