mosfet simulator in python

To simulate a MOSFET in Python, you can use the following approaches:

1. Using the Shockley Equation

The Shockley equation describes the current-voltage relationship of a MOSFET. You can use this equation to simulate the MOSFET's behavior.

main.py
import numpy as np
import matplotlib.pyplot as plt

def shockley_equation(vgs, vds, k, vt):
    """
    Shockley equation for MOSFET current-voltage relationship.

    Parameters:
    vgs (float): Gate-source voltage.
    vds (float): Drain-source voltage.
    k (float): Transconductance parameter.
    vt (float): Threshold voltage.

    Returns:
    float: Drain current.
    """
    if vgs < vt:
        return 0
    else:
        return k * (vgs - vt)**2 * (1 + (vds / (vgs - vt)))

# Example usage
vgs_values = np.linspace(0, 5, 100)
vds = 5
k = 0.1
vt = 1

ids = [shockley_equation(vgs, vds, k, vt) for vgs in vgs_values]

plt.plot(vgs_values, ids)
plt.xlabel('Vgs (V)')
plt.ylabel('Ids (A)')
plt.title('MOSFET I-V Curve')
plt.show()

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2. Using the SPICE Model

You can use the SPICE model for MOSFETs to simulate the device's behavior. The SPICE model is a more complex and accurate model that takes into account various physical effects.

main.py
import numpy as np
from scipy.integrate import odeint

def spice_model(state, t, vgs, vds, k, vt):
    """
    SPICE model for MOSFET current-voltage relationship.

    Parameters:
    state (list): State variables (Vds, Ids).
    t (float): Time.
    vgs (float): Gate-source voltage.
    vds (float): Drain-source voltage.
    k (float): Transconductance parameter.
    vt (float): Threshold voltage.

    Returns:
    list: Derivatives of state variables.
    """
    vds Spice, ids = state
    if vgs < vt:
        return [0, 0]
    else:
        return [k * (vgs - vt)**2 * (1 + (vds / (vgs - vt))), 0]

# Example usage
vgs = 5
vds = 5
k = 0.1
vt = 1

state0 = [0, 0]
t = np.linspace(0, 10, 100)

state = odeint(spice_model, state0, t, args=(vgs, vds, k, vt))

plt.plot(t, state[:, 0])
plt.xlabel('Time (s)')
plt.ylabel('Vds (V)')
plt.title('MOSFET Transient Response')
plt.show()

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3. Using a MOSFET Simulation Library

There are several Python libraries available that provide MOSFET simulation capabilities, such as PySPICE and ngspice. These libraries provide a more comprehensive and accurate simulation environment.

main.py
import PySpice.Unit_techniques as techniques
from PySpice.Spice.Parser import Circuit
from PySpice.Spice.Netlist import SubCircuitFactory

# Define the MOSFET subcircuit
mosfet_subcircuit = SubCircuitFactory('MOSFET', 'D1 N+ N- Vds Vgs')

# Define the circuit
circuit = Circuit('MOSFET_Circuit')
circuit.subcircuit(mosfet_subcircuit)

# Define the simulation
simulation = circuit.simulator(temperature=25, nominal_temperature=25)

# Run the simulation
analysis = simulation.ac(start_frequency=1, end_frequency=100, number_of_points=1000)

# Plot the results
plt.plot(analysis.frequency, analysis.voltage(1))
plt.xlabel('Frequency (Hz)')
plt.ylabel('Voltage (V)')
plt.title('MOSFET AC Response')
plt.show()

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Note that these examples are simplified and are intended to illustrate the basic concepts of MOSFET simulation in Python. In practice, you may need to consider additional factors, such as device parasitics, temperature effects, and non-idealities.

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related categories

mosfet-simulation
python
electronics

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