Concepts and features
R&S
®
ZNA
279User Manual 1178.6462.02 ─ 29
getting at the output only the amplified differential contents in this signal, which
depends on the imbalance. Usually, S-parameters of balanced devices measured with
active imbalance compensation will exhibit a maximum or minimum at zero imbalance.
The imbalance compensation is not only performed for mixed-mode S-parameters, but
also for the imbalance-swept a wave itself when it is selected as a measured quantity,
as well as for ratios including that wave.
4.7.5.3 True differential mode on frequency-converting DUTs
True differential mode can be combined with frequency-converting measurement
modes. For this type of measurements, a consistent calibration is particularly impor-
tant.
4.7.5.4 True differential mode with frequency converters
If the frequency converter mode is combined with true differential mode, the analyzer
generates a true differential or common mode stimulus signal at a calibrated reference
plane which is located after two frequency converter ports. To achieve this, two fre-
quency converters with independent sources are combined to form a balanced con-
verter port. The frequency converters must provide the RF drive signal simultaneously
so that a third, independent LO signal is required.
Depending on the network analyzer type and the number of independent sources avail-
able, different test setups are possible.
4.7.6 Pulsed measurements
Option R&S ZNA-K7
Measurements on pulsed RF signals are required in many areas of RF and microwave
technology. Pulsed signals are used in mobile phone applications and radar systems,
and amplifiers are typically designed for pulsed rather than continuous wave (CW) con-
ditions.
The analyzer performs pulsed measurements in analogy to a time sweep (i.e. at con-
stant receiver frequency), but with a much higher sampling rate. Option R&S ZNA-K7
Optional extensions and accessories
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