4 MEASUREMENT CONDITIONS SETTING
87
Figure 4.18 Vector mixer measurement setup
The vector mixer measurement method ensures same frequency at the both test ports of
the Analyzer, in normal operation mode. In this case, the only applicable calibration
method is vector mixer calibration (See section 5.7).
4.11.2 Frequency Offset Mode
The frequency offset mode enables you to measure transmission S-parameters of the
frequency translating devices. In this section, we refer to the frequency translating
devices such frequency shifting devices as mixers and converters, as well as devices
dividing or multiplying frequency.
This measurement mode is based on frequency offset of receiver port frequency relative
to source port frequency. The frequency offset is defined for each port using three
coefficients: multiplier, divider, and offset. These coefficients allow for calculation of a
port frequency relative to the basic frequency range.
ofsbaseport FF
D
M
F+=
M – multiplier,
D – divider,
Fofs – offset,
Fbase – basic frequency.
LO
Mixer under
test
Calibration
mixer/filter
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