
Phase Noise Without Using a PLL measurement type is used to measure
the residual phase noise of a Two Port (input/output) device. Two Port
devices can be divided into two groups:
• Devices that translate the input frequency to a different output fre-
quency, such as frequency multipliers and dividers. (The measurement
setup for these types of devices requires that two similar devices be
used.)
SOURCE CONTROL FOR MEASUREMENT UITHOUT
fi
PHRSE LOCK LOOP
HP U84Sfl
SOURCE
USER'S SRCE
MANUAL CNTRL
Phase Shifter DUT
D'JT
Quadrature'
will
be
established
manually.
DONE kontrol
Figure 2-3. Phase Noise Without Using a Phase Lock Loop
Measurement Setup for Frequency Translator Devices
Devices that do not translate the input frequency, such as amplifiers
and filters. For these devices, quadrature can often be attained by
introducing the appropriate delay in one of the input paths, as shown
in Figure 2-3, or by varying the source frequency. (Note that devices
with large amounts of delay may require measurement of two similar
devices, as shown for frequency translator devices.)
2-6 Type/Range
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