R&S ZVB - Page 413

R&S
®
ZVA / R&S
®
ZVB / R&S
®
ZVT GUI Reference
Channel Menu
Operating Manual 1145.1084.12 – 30 398
Remote control:
[SENSe<Ch>:]SWEep:TYPE IAMPlitude
SOURce<Ch>:TDIF:IMBalance:AMPLitude:LPORt
SOURce<Ch>:TDIF:IMBalance:AMPLitude:STARt
SOURce<Ch>:TDIF:IMBalance:AMPLitude:STOP
CALCulate<Ch>:TDIF:IMBalance:COMPensation[:STATe]
Phase Imbalance Sweep
The phase imbalance sweep is a special application of the true differential mode. The analyzer generates
a balanced signal at one of its logical ports, however, the relative phase of the two signal components is
varied according to the selected phase range. This variation may have an impact on the measured mixed-
mode S-parameters if the DUT is operated in its nonlinear range.
Characteristics of the sweep
The phase imbalance sweep is performed as follows:
 The phase imbalance of the differential mode signal is defined as the difference in phase (in deg)
of the wave quantities at the two physical ports of the swept logical port plus 180 deg: Imbalance
= arg (a
k
) – arg (a
l
) – 180 deg, where k > l.
 The phase imbalance of the common mode signal is defined as the difference in phase (in deg) of
the wave quantities at the two physical ports of the swept logical port: Imbalance = arg (a
k
) – arg
(a
l
), where k > l.
 The selected phase imbalance is applied to the differential as well as to the common mode signal.
The analyzer generates both stimulus modes according to what the measurement of the selected
quantity requires.
At least one logical port must be defined, and the true differential mode must be active to enable the
phase imbalance sweep. Activating the sweep (Channel – Sweep – Sweep Type: Phase Imbalance)
opens the following configuration dialog:
 Logical Port selects the swept logical port.
 Compensate Imbalance of a Waves selects the calculation method for S-parameters, ratios and
derived quantities; see background information in section Amplitude Imbalance Sweep.
 CW Frequency defines the frequency of all stimulus signals, which is constant over the entire
sweep. This setting is identical with the CW frequency for power, time and CW mode sweeps.
 Source Power defines the constant power of the balanced source, corresponding to the channel
power P
ch
in the tables in section Source Power in True Differential Mode. This setting is identical
with the constant power for frequency, time and CW mode sweeps.
The range of relative phases for the phase imbalance sweep is set via Channel – Stimulus – Start and