DC Current

Symbol

Information

A DC current source provides a constant current, regardless of voltage or circuit conditions. The output current remains fixed at a specified value:

\[I = I_{dc}\]

Where:

• \(I\) is the output current (Amperes)

• \(I_{dc}\) is the constant DC current value (default: 1mA)

Ports

• p: Positive terminal

• n: Negative terminal

Model

The DCCurrent model represents a constant current source.

This model provides a fixed DC current, independent of the voltage or other circuit elements.

Attributes:

• I (signal): Output current through terminals (p, n).

• Idc (param): Constant current value, default is 1mA.

Methods:

analog(): Defines the constant current output equation:

\[I = I_{dc}\]

from pyams.lib import model, signal, param, current

class DCCurrent(model):
    """
    DC current source model providing a constant current.
    """

    def __init__(self, p, n):
        # Signal declaration
        self.I = signal('out', current, p, n)

        # Parameter declaration
        self.Idc = param(0.001, 'A', 'Value of constant current')

    def analog(self):
        """Defines the constant current output equation."""
        self.I += self.Idc  # I = Idc

Command syntax

The syntax for defining a DC current source in a PyAMS simulation:

# Import the model
from pyams.models import DCCurrent

# Iname: is the name of the current source instance
# p, n: The connection points in the circuit
Iname = DCCurrent(p, n)