eldo_user

Working with S, Y, Z Parameters
Simulation Setup for S, Y, Z Parameter Extraction
Simulation Setup for S, Y, Z Parameter
Extraction
Special sources must be added at each port of the circuit to be analyzed. The number of the port
and the reference impedance for S parameters must be specified in the Eldo control file as a
source as follows:
Tip
See also “Independent Voltage Source” and “Independent Current Source” in the Eldo
Reference Manual.
Syntax
Voltage Source
Vyy NP NN IPORT=VAL [RPORT=VAL] [CPORT=VAL] [LPORT=VAL] [MODE=KEYWORD]
Vyy NP NN IPORT=VAL ZPORT_FILE=filename [CPORT=VAL] [LPORT=VAL]
+ [MODE=KEYWORD]
Current Source
Iyy NP NN IPORT=VAL [RPORT=VAL] [CPORT=VAL] [LPORT=VAL] [MODE=KEYWORD]
Iyy NP NN IPORT=VAL ZPORT_FILE=filename [CPORT=VAL] [LPORT=VAL]
+ [MODE=KEYWORD]
Parameters
• yy
Required. Name of the port.
• NP
Required. Name of the positive node.
• NN
Required. Name of the negative node.
• IPORT
Required. This is a strictly positive number that is unique and is used as the port number:
this number is used for naming the outputs (for instance, .PLOT AC S(1,2)). An error
message will be issued if two port instances have the same value for IPORT, or if an IPORT
is missing (for example maximum IPORT number found in the netlist is 4, and there is no
instance with IPORT 3).
• RPORT
Value of the reference impedance in Ohms. Default value is 50Ω.
• CPORT
Capacitor placed in series (for V source) or parallel (for I source) with RPORT. Defaults to
0, in which case it behaves like a zero voltage source (that is, CPORT would have no effect).
684
Eldo® User's Manual, 15.3