Square Current
Symbol
Information
A Square Wave Current Source generates a periodic square wave signal that alternates between high and low states.
Where:
\(I_a\): Amplitude of the square wave current
\(I_{off}\): Offset current
\(T\): Period of the waveform
Ports
p: Positive terminal
n: Negative terminal
Model
The SquareCurrent model generates a square wave current signal, useful for clock signals, digital circuits, and PWM-based control applications.
Attributes:
I (signal): Output current between terminals (p, n).
Ia (param): Amplitude of square wave current, default is 1 A.
T (param): Period of the waveform, default is 0.1 sec.
Ioff (param): Offset current, default is 0 A.
Methods:
analog(): Implements the square wave current equation.
from pyams.lib import model, signal, param, time
from pyams.lib import current
# Square Current Source Model--------------------------------------------------
class SquareCurrent(model):
"""
This class models a Square Wave Current Source.
"""
def __init__(self, p, n):
# Signal declaration
self.I = signal('out', current, p, n)
# Parameter declarations
self.Ia = param(1.0, 'A', 'Amplitude of square wave current')
self.T = param(0.1, 'Sec', 'Period')
self.Ioff = param(0.0, 'A', 'Offset current')
def analog(self):
"""Defines the square wave current equation."""
t = time # Get the current simulation time
cycle_time = t % self.T # Time within the current period
if cycle_time < (self.T / 2):
self.I += self.Ia + self.Ioff # High state
else:
self.I += self.Ioff # Low state
Command syntax
The syntax for defining a square current source in a PyAMS simulation:
# Import the model
from pyams.models import SquareCurrent
# Iname: is the name of the current source instance
# p, n: The connection points in the circuit
Iname = SquareCurrent(p, n)