Concepts and features
R&S
®
ZND
122
User Manual 1173.9557.02 ─ 61
Example:
2 physical ports
: Reflection measurements on 1 balanced port
Bal.
port
Differential mode
Z
ref
= Z
0d
Common mode
Z
ref
= Z
0c
DUT
Balanced port:
Log.
VNA
port
3 physical ports
: Reflection and transmission measurements on 1 balanced port
Bal.
port
Differential mode
Z
ref
= Z
0d
Common mode
Z
ref
= Z
0c
DUT
Balanced port:
Log.
VNA
port
Single
ended
port
Single-ended
(unbalanced) port
Z
ref
= Z
connector
4 physical ports
: Reflection and transmission measurements on 1 or 2 balanced ports
Bal.
port
Differential mode
Z
ref
= Z
0d
Common mode
Z
ref
= Z
0c
DUT
Balanced port:
Log.
VNA
port
Single
ended
ports
Single-ended
(unbalanced) ports
Z
ref1
= Z
connector1
Z
ref2
= Z
connector2
Bal.
port
Differential mode
Z
ref
= Z
0d
Common mode
Z
ref
= Z
0c
DUT
Balanced port:
Log.
VNA
port
Bal.
port
Differential mode
Z
ref
= Z
0d
Common mode
Z
ref
= Z
0c
Balanced port:
Log.
VNA
port
A balanced port configuration is defined in two steps: First, select the pairs of physical
ports that you want to combine to form balanced ports. Second, define the two refer-
ence impedances for the differential and common mode at each balanced port. Both
steps can be done in a single "Balanced Ports" dialog. The most commonly used bal-
anced port configurations and impedances are predefined and can be selected in the
"S-Parameter Wizard".
The "Balanced Ports" dialog allows you to switch to balanced operation and to define
the reference impedances the differential and common mode.
Depending on the test setup, the analyzer provides different types of mixed mode
parameters; refer to the following sections for details.
4.3.6.2
Mixed-mode parameters
Mixed mode parameters are an extension of normal mode parameters (e.g. S-parame-
ters, impedances and admittances) for balanced measurements. The analyzer can
measure mixed mode parameters once a balanced port configuration is selected.
Measurement results
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