ISRC - DC Current Source Model

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Modified by Phil Loughhead on Mar 4, 2014

Model Kind

Current Source

Model Sub-Kind

DC Source

SPICE Prefix

SPICE Netlist Template Format

@DESIGNATOR %1 %2 @VALUE #"AC MAGNITUDE"|AC @"AC MAGNITUDE"| @"AC PHASE"

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.

Value	amplitude of the source current (in Amps).
AC Magnitude	the magnitude of the source when used in an AC Small Signal Analysis (typically 1A).
AC Phase	the phase of the source when used in an AC Small Signal Analysis.

Notes

This source produces a constant current output and is generally used to power the circuit.
If a value for the DC source current is not specified, an error will occur when parsing the circuit to the Simulator.
If specifying AC criteria, the following should be observed;

If a value for the AC Magnitude is entered, a value for the AC Phase MUST also be given, otherwise an error will occur when parsing the circuit.
If a value for the AC Magnitude is omitted but a value for AC Phase is defined, the circuit will parse to the Simulator OK, but the SPICE netlist will not contain any AC information for the source.

The simulation-ready DC current source component (ISRC) can be found in the Simulation Sources integrated library (\Library\Simulation\Simulation Sources.IntLib).

Examples

Consider the DC voltage source in the above image, with the following characteristics:

Pin1 (positive) is connected to net N1
Pin2 (negative) is connected to net VEE
Designator is IEE
Value = 10.16E-6
No AC parameters are specified.

The entry in the SPICE netlist would be:

*Schematic Netlist: IEE N1 VEE 10.16E-6