Rohde & Schwarz 1145.1010.04/05/06, Operating Manual

Page: 344 / 813

Channel Menu R&S
®
ZVA/ZVB/ZVT
1145.1084.12 4.182 E-6
Deembedding a DUT
Deembedding and embedding are inverse operations: A deembedding problem is given if an arbitrary
real network connected to the DUT is to be virtually removed in order to obtain the characteristics of the
DUT alone. Deembedding is typically used for DUTs which are not directly accessible because they are
inseparably connected to other components, e.g. for MMICs in a package or connectors soldered to an
adapter board.
To be numerically removed, the real network must be described by a set of S-parameters or by an
equivalent circuit of lumped elements. Deembedding the DUT effectively extends the calibration plane
towards the DUT ports, enabling a realistic evaluation of the DUT without the distorting network.
Deembedding can be combined with length offset parameters.
The simplest case of one-port deembedding can be depicted as follows:
The embedding/deembedding function in the Virtual Transform menu has the following characteristics:
•
Embedding and deembedding can be combined with balanced port conversion: the (de-
)embedding function is available for single ended and balanced ports.
•
A combination of four-port and two-port networks (not necessarily both) can be applied to
balanced ports; two-port networks can be applied to single ended ports.
•
Transformation networks can be defined by a set of S-parameters stored in a Touchstone file or
by an equivalent circuit with lumped elements.
•
The same networks are available for embedding and deembedding.
•
Port Overview... opens a dialog providing an overview of all analyzer ports with their reference
impedances and transformation networks.
•
Single Ended Port Deembedding/Embedding directly opens the configuration dialog for the
single ended circuits and activates or deactivates (de-)embedding.
•
Balanced Port Deembedding/Embedding directly opens the configuration dialog for the
balanced circuits and activates or deactivates (de-)embedding. These commands are enabled
only after a balanced port configuration has been defined.