# CI Card

The CI card is used to define interconnections and terminations between cables.

In the Solve/Run tab, in the Cables group, click the  Interconnect cable (CI) icon.

## Parameters:

Define/ replace connections
New connection, replaces previous connections with the same name.
Remove all connections at this interconnect/termination
All previously defined connections (with this name) at this specific interconnection/termination are removed.
Remove all previously defined interconnections/terminations
All previously defined interconnections/terminations are removed.
Connection name
The name of the connection.
Pin connections (in .pre file)
The connection between pins are specified in the .pre file.
Pin
The pins between which a connection will be made.
The following loading options between two pins are available: direct short, open, complex, series RLC, parallel RLC circuit and a 1-port Touchstone load specified in either a .s1p, .z1p or .y1p file.
Probes
A voltage and/or current probe may be placed between two pins.
Network circuit connecting pins
Note: This option is not supported in conjunction with a closed metallic surface.
Spice circuit defined externally and directly in .pre file
A SPICE circuit is connected between multiple pins. The SPICE circuit can be provided as an external file or it can be included directly into the .pre file.
SPICE file name
The file name of the SPICE circuit to be connected between two pins. The file name is required when the SPICE circuit is loaded from an external file, but should not be used when entering the SPICE circuit directly in the .pre file. When the SPICE circuit is included directly in the .pre file, a field will be displayed where the circuit can be entered.
Circuit name (optional)
The main sub-circuit name to be used from the .cir file. If left unspecified, the name should match the sub-circuit name.
Number of pin connections
The number of pin connections to be made.
Number of probes
The number of voltage and/or current probes.
Connector
The label of the connector to be connected to the SPICE circuit.
Pin
The pin of the connector to which the SPICE circuit will be connected to.
Probes
The type of probe, either voltage or current.
General network from external file
A Touchstone network is connected between multiple pins. The general network is provided as an external file with S, Y or Z parameters.
Touchstone file name
The file name of the Touchstone network to be added to the cable schematic.
Number of ports
The number of ports in the general network.
Note: There are two pin connections for each port definition.
Connector +
The label of the connector to be connected to the general network.
Connector -
The label of the connector to be connected to the general network.
Pin +
The pin of the connector to which the general network will be connected to.
Pin -
The pin of the connector to which the general network will be connected to.
Straight connector connection
This option is used when similar cables are connected.
Number of connections
The number of connections between similar cables.
Connector
The label of the connectors of the cables which will be connected.
Transformer (mutual coupling) component
This option is used when a transformer is connected in a circuit.
Number of transformer components
The number of transformers connected between similar cables.
Coupled inductor
Specify the connections for coupled inductor 1 and 2 of the transformer component.
Inductance
The inductance of the coupling inductor in Henry.
Connector
The label of the connector which the positive or negative pin of the coupling inductor is connected to.
Pin
The pin of the connector to which the positive or negative pin of the transformer coupling inductor is connected to.
Phase dot position
Select at which pin (positive or negative) the phase dot is positioned at for the coupling inductor.
Coupling
Specify the coupling coefficient (K) a value greater than 0 and less than or equal to 1.
Probes
The type of probe, either voltage or current for coupling inductor 1 and 2.
Voltage controlled voltage source (VCVS) component
This option is used to specify the connection of the voltage controlled voltage source in a circuit.
Number of VCVS components
The number of VCVS components between similar cables.
Connection pins
Connector
The label of the connector which the positive or negative pin of the VCVS is connected to.
Pin
The pin of the connector to which the positive or negative pin of the VCVS is connected to.
Control pins
Connector
The label of the connector which the positive or negative pin of the control (measurement) pin or is connected to.
Pin
The pin of the connector to which the positive or negative pin of the control (measurement) pin is connected to.
Control voltage
Specify the Voltage gain for the VCVS.
Probes
The type of probe, either voltage or current.
Closed metallic surface (defined by geometry labels)
Note: This option is not supported in conjunction with network circuit connecting pins.
This option is used to connect combined MoM/MTL cable paths to the same harness using a closed metallic surface with a label.
Number of combined MoM/MTL paths
The number of the combined MoM/MTL cable paths terminating on the metallic surface.
Number of labels
The number of geometry labels that define the closed metallic surface.
Labels
The list of geometry labels that define the closed metallic surface.
Connector name
All circuit connections should be made to this connector name and pin 0.

## Adding probes in SPICE circuits

Voltage and current probes can be added to SPICE circuits so that these values become available in POSTFEKO. Additional circuitry is required in the SPICE circuit so that these values can be obtained for the probes. This will be explained using an example model illustrated in Figure 2 representing the SPICE circuit below.

* RLC parallel circuit

.SUBCKT SPICE_RL n1 n2 vprobe1 iprobe1

* RLC circuit
R2 n1a n2 25
L2 n1a n2 5e-3
C2 n1a n2 20e-9

* Define current probe (0V voltage source and current controlled voltage source)
vprobe n1 n1a ac 0V 0 dc 0
hprobe1 iprobe1 0 vprobe 1.0

* Define voltage probe (voltage controlled voltage source)
eprobe1 vprobe1 0 n1 n2 1.0

.ENDS SPICE_RLC
.end

Current probes are added to the SPICE circuit by adding a 0 V voltage source (vprobe) in series with other components in the branch where the current is to be probed. A current controlled voltage source (hprobe1) is then added between the global ground and a connection that is made available to the kernel as a probe (iprobe1). The kernel will load this pin with a 1 kΩ resistor and make the resulting voltage, that is directly proportional to the value of the current, available as the probe current (correctly scaled).

Voltage probes are added by simply adding a voltage controlled voltage source (eprobe1) between the global ground and a pin that is made available to the kernel as a probe. Similar to the current probe, the probe pin is loaded by the kernel with a 1 kΩ resistor so that the probed voltage can be made available in POSTFEKO.