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High Dynamic Range Swept RF/IF Conversion Loss
The HP
8753E’s
frequency offset mode enables the testing of high dynamic range frequency
converters (mixers), by tuning the analyzer’s high dynamic range receiver above or below its
source, by a fixed offset. This capability allows the complete measurement of both pass and
reject band mixer characteristics.
‘Ihe analyzer has a 35
dl3
dynamic range limitation on measurements made directly with its R
(phaselock) channel. For this reason, the measurement of high dynamic range mixing devices
(such as mixers with built in amplification and filtering) with greater than 35 dB dynamic range
must be made on either the analyzer’s A or B channel, with a reference mixer providing input
to the analyzer’s R channel for phaselock.
This example describes the swept IF conversion loss measurement of a mixer and
filter.
The
output filtering demonstrates the analyzer’s ability to make high dynamic range measurements.
lb avoid the complexity of performing a separate power meter calibration over the RF
frequency range while the mixer under test and reference mixer are operating, a broad band
power meter calibration is used. The broad band calibration covers the entire range of IF and
RF frequencies.
1. Set the following analyzer parameters:
2. Calibrate and zero the power meter.
3. Connect the measurement equipment as shown in Figure 3-10.
Caution
‘Ib
prevent connector damage, use an adapter (HP part number 1250-1462) as a
connector saver for R CHANNEL IN.
3-12
Making Mixer Measurements