NS - Nodeset Model

Model Kind

Initial Condition

Model Sub-Kind

Initial Node Voltage Guess

SPICE Prefix

None

SPICE Netlist Template Format

.NODESET V(%1)=@"INITIAL VOLTAGE"

Parameters (definable at component level)

The following component-level parameters are definable for this model type and are listed on the Parameters tab of the Sim Model dialog. To access this dialog, simply double-click on the entry for the simulation model link in the Models region of the Component Properties dialog.

Notes

1. The Nodeset device is used to specify the starting voltage for a node in the circuit during a preliminary pass of the operating point analysis. After this initial pass, the restriction is released and the iterations continue to the true bias solution.
2. This device is not usually necessary in order to achieve convergence in most circuits. However, it may be a useful aid when performing simulations on bistable or astable circuits.

Examples

Consider the Nodeset device in the above image, with the following characteristics:

• The pin of the device is connected to net IN
• Designator is NS1
• Initial Voltage = 5V

The entry in the SPICE netlist would be:

*Schematic Netlist:
.NODESET V(IN)=5V