Source code for PySpice.Physics.SemiConductor

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#
# PySpice - A Spice Package for Python
# Copyright (C) 2014 Fabrice Salvaire
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
####################################################################################################

""" This module provides semiconductor models.
"""

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import numpy as np

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import PySpice.Physics.PhysicalConstants as Cst

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[docs]class ShockleyDiode: """ This class provides an implementation of the Shockley Diode Model. """ ############################################## def __init__(self, Is=10e-12, # 10 pA n=1, degree=25, kelvin=None): self.Is = Is # reverse bias saturation current self.n = n # ideality factor or emission coefficient self.T = Cst.temperature(degree=degree, kelvin=kelvin) ############################################## @property def Vt(self): """ Thermal Voltage """ return Cst.kT(kelvin=self.T) / Cst.q ############################################## def I(self, Vd): return self.Is*(np.exp(Vd/(self.n*self.Vt)) - 1) ##############################################
[docs] def rd(self, Vd): """ Dynamic resistance defined by dVd/dI. """ return self.n*self.Vt/self.I(Vd)