R&S ZNB Series User Manual page 139

®
R&S ZNB/ZNBT
Example:
2 physical ports: Reflection measurements on 1 balanced port
3 physical ports: Reflection and transmission measurements on 1 balanced port
Single-ended
(unbalanced) port
Z
4 physical ports: Reflection and transmission measurements on 1 or 2 balanced ports
Single-ended
(unbalanced) ports
Z
Z
Balanced port:
Differential mode
Common mode
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".
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.
Mixed mode parameters are used to distinguish the following three port modes:
●
s: Single-ended (for unbalanced ports)
●
d: Differential mode (for balanced ports)
User Manual 1173.9163.02 ─ 62
= Z
ref connector
= Z
ref1 connector1
= Z
ref2 connector2
Log.
Z = Z
ref 0d
VNA
port
Z = Z
ref 0c
Bal.
port
DUT
Single
Bal.
ended
port
port
DUT
Single
Bal.
ended
port
ports
DUT
Bal. Bal.
port port
DUT
Concepts and features
Measurement results
Balanced port:
Differential mode
Log.
Z = Z
ref 0d
VNA
port
Common mode
Z = Z
ref 0c
Balanced port:
Differential mode
Log.
Z = Z
ref 0d
VNA
port
Common mode
Z = Z
ref 0c
Balanced port:
Differential mode
Log.
Z = Z
ref 0d
VNA
port
Common mode
Z = Z
ref 0c
Balanced port:
Differential mode
Log.
Z = Z
ref 0d
VNA
port
Common mode
Z = Z
ref 0c
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