eldo_user

Working with S, Y, Z Parameters
Instantiating a Block Defined by X-Parameters
Instantiating a Block Defined by X-Parameters
X-parameters can be used in an XBLOCK, similar to the S parameters FBLOCK syntax. They
can be used in Eldo RF SST analysis or Eldo Classic DC, AC, and noise analyses.
Tip
The X-parameters parser is based on the GMDIF version 2.0 file format:
http://edocs.soco.agilent.com/display/ads2009U1/
Working+with+Data+Files#WorkingwithDataFiles-XparameterGMDIFFormat
Syntax
.MODEL XBLOCK MACRO LANG=C
XNAME XBLOCK PARAM:
+ [M=VAL]
+ [SINGLE_REFERENCE_NODE=VAL]
+ STRING: FILENAME
+ PIN: IP1 IN1 ... IPN INN
Parameters
• .MODEL
The first line (.MODEL) is the reference to the model, where the entity is called XBLOCK.
The other lines are the model parameters.
Note
This .MODEL line is optional. This declaration is not a requirement of Eldo when
referencing embedded Eldo XBLOCK models.
• PARAM:
This keyword precedes the list of optional parameters.
• M=val
Device multiplier parameter, simulating the effect of multiple X-block elements in parallel.
Default value is 1.
• SINGLE_REFERENCE_NODE=val
A single reference node is supported. When the number of pins of the XBLOCK model is
even, Eldo considers that each port has two pins. When the number of pins is odd, Eldo
considers the reference pin is the same for all ports (and it is the last pin). Specify
SINGLE_REFERENCE_NODE=1 to enable the XBLOCK model to consider the last pin as
the common reference pin for all ports if the number of ports is the number of pins−1.
• STRING: filename
Used to define the name of the touchstone file, or poles/residues file (.pls), containing the
input data. Path definition is allowed.
710
Eldo® User's Manual, 15.3