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Table Of Contents
226 Agilent E5505A User’s Guide
7
Residual Measurement Fundamentals
2
Measure the power level that will be applied to the Signal Input port of the
test set’s phase detector. Table 35 on page 226 shows the acceptable
amplitude ranges for the E5505A system phase detectors.
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 (Figure 160). The RF calibration 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.
4
Measure the carrier-to-spur ratio of the non-modulated side of the phase
detector (Figure 161 on page 227). 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
Table 35 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 160 Carrier-to-spur ratio of modulated signal