R&S ZNL, Руководство пользователя

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VNA concepts and features
R&S
®
ZNL/ZNLE
242 User Manual 1178.5966.02 ─ 19
The purpose of the keywords is to give more details about the file contents in a stand-
ardized way. During "Version 2.0" export, the R&S
ZNL/ZNLE writes the following key-
words to the generated Touchstone file:
Keyword Example Description
[Version] [Version] 2.0 Specification version, typically the first line in the file
Currently only
2.0
is allowed
[Number of Ports] [Number of Ports] 2 The
n
in the generated
snp
file.
Except for the "s1p Active Trace" export,
n
equals the
number of physical ports involved in the export.
[Two-Port Data Order] [Two-Port Data Order] 21_12 Specifies the data order in
s2p
files.
●
21_12 indicates data order f N11 N21 N12 N22
●
12_21
indicates data order
f N11 N12 N21 N22
(see "Data arrangement" on page 243)
The R&S ZNL/ZNLE generates
s2p
files with fixed data
order
21_12
(according to the TS1.1 standard).
[Number of Frequencies] [Number of Frequencies] 201 Number of exported frequency sweep points; can also
be derived from the
Network parameter data block.
[Reference] [Reference] 50 75 If the exported S-parameter data were renormalized
with port-specific impedances, the real parts of these
impedances are listed as arguments of the
[Reference]
keyword.
Overrides the common reference impedance of the
"Option line" on page 238
Note: currently ignored during import
[Mixed-Mode Order] [Mixed-Mode Order] D1,2 C1,2 Required if a balanced port is involved.
In the example to the left, nominal port 1 is the differen-
tial mode and nominal port 2 is the common mode of
balanced port (1,2).
Conveys the same information as the Port assignments
(Version 1.1 and Version 2.0) comment
[Network Data] [Network Data] ! no args Marks the begin of the Network parameter data block
[End] [End] ! no args Marks the end of the network parameter data section
and is typically placed in the last line of the export file
For details and more keywords, see the Touchstone File Format Specification Version
2.0 (
http://www.ibis.org/touchstone_ver2.0/touchstone_ver2_0.pdf ).
During import, the R&S ZNL/ZNLE currently only considers the
[Two-Port Data
Order]
.
Network parameter data
The network parameter data section contains one block of network parameters per fre-
quency point. Each block is preceded by a frequency value, i.e. the first entry in the
first (or only) data line of a data block is a frequency value. The complex network
parameter data is formatted as pairs of values.
Operations on traces