NETWORK ANALYZER
1
IO
dB
FILTER
EXTERNAL
LO
SOURCE
pg630e
Figure 3-12.
Connections for a High Dynamic Range Swept IF Conversion Loss Measurement
14. To set the frequency offset mode LO frequency, press:
15. To select the converter type and low-side
Lo
measurement configuration, press:
In this low-side
Lo,
down converter measurement, the analyzer’s source frequency range
wiII
be offset higher than the receiver frequency range. The source frequency range can be
determined from the following equation:
receiver frequency range (100
-
1000 MHz) +
Lo
frequency (1500 MHz)
=
1.6-2.5
GHz
16.
To
view the conversion loss in the best vertical resolution, press:
F’igure
3-13 shows the conversion loss of this low-side
Lo,
mixer with output filtering.
Notice that the dynamic range from the pass baud to the noise floor is
welI
above the
dynamic range
limit
of the R Channel. If the mixer under test
also
contained amplification,
then this dynamic range would have been even greater due to the conversion gain of the
mixer.
Making Mixer Measurements
3-15
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