System Overview
R&S
®
ZVA
85
Getting Started 1145.1090.62 ─ 13
Bal.
port
Differential mode
Z
ref
= Z
0d
Common mode
Z
ref
= Z
0c
DUT
Balanced port:
Log.
NWA
port
3-port analyzers: 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.
NWA
port
Bal.
port
Differential mode
Z
ref
= Z
0d
Common mode
Z
ref
= Z
0c
Balanced port:
Log.
NWA
port
4-port analyzers: 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.
NWA
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.
NWA
port
Bal.
port
Differential mode
Z
ref
= Z
0d
Common mode
Z
ref
= Z
0c
Balanced port:
Log.
NWA
port
A balanced port configuration is defined by simply selecting the pairs of physical ports
that are combined to form balanced ports and defining the two reference impedances
for the differential and common mode at each balanced port. All this is done in a single
dialog; refer to the help system for details and measurement examples. The most com-
monly used balanced port configurations and impedances are predefined and can be
selected in the "Measurement Wizard".
Depending on the test setup, the analyzer provides different types of mixed mode
parameters; refer to the following sections for details.
3.3.2.13
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 as soon as 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)
●
c: Common mode (for balanced ports)
Measured Quantities
