/usr/share/octave/packages/ocs-0.1.5/sbn/Mdiode.m is in octave-ocs 0.1.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | ## Copyright (C) 2006,2007,2008 Massimiliano Culpo, Carlo de Falco
##
## This file is part of:
## OCS - A Circuit Simulator for Octave
##
## OCS 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.
##
## 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 (see the file LICENSE); if not,
## see <http://www.gnu.org/licenses/>.
##
## author: culpo@math.uni-wuppertal.de, Carlo de Falco <cdf _AT_ users.sourceforge.net>
## -*- texinfo -*-
##
## @deftypefn{Function File} @
## {[@var{a},@var{b},@var{c}]=}Mdiode(@var{string},@var{parameters},@
## @var{parameternames},@var{extvar},@var{intvar},@var{t})
##
## SBN file implementing models for diodes.
##
## @var{string} is used to select among models. Parameters are listed
## as inner items. Possible models are:
##
## @itemize @minus
## @item @var{string} = "simple" (Usual exponential diode model)
## @itemize @minus
## @item Is -> reverse current
## @item Vth -> thermal voltage
## @item Rpar -> parasitic resistance
## @end itemize
## @item @var{string} = "PDEsymmetric" (Drift-Diffusion PDE model)
## @itemize @minus
## @item len -> diode length
## @item Nnodes -> number of nodes of 1D grid
## @item Dope -> doping (abrupt and symmetric)
## @item toll -> absolute tolerance
## @item maxit -> max iterations number
## @item Area -> device area
## @end itemize
## @end itemize
##
## See the @cite{IFF file format specifications} for details about
## the output structures.
##
## @seealso{prs_iff,asm_initialize_system,asm_build_system}
## @end deftypefn
function [a,b,c] = Mdiode (string,parameters,parameternames,extvar,intvar,t)
switch string
case "simple"
Is = 1e-14;
Vth = 2.5e-2;
Rpar = 1e12;
for ii=1:length(parameternames)
eval([parameternames{ii} "=" num2str(parameters(ii)) ";"])
endfor
vp = extvar(1);
vm = extvar(2);
I = Is*(exp((vp - vm)/Vth) -1 ) + (vp - vm)/Rpar;
geq = Is*exp((vp - vm)/Vth)/Vth + 1/Rpar;
a = zeros(2);
b = [geq -geq; -geq geq];
c = [I ; -I] ;
break
case "PDEsymmetric"
len = 1e-6;
Nnodes = 100;
Dope=1e23;
toll = 1e-5;
maxit = 100;
ptoll = 1e-10;
pmaxit = 100;
Area = 1e-10;
for ii=1:length(parameternames)
eval([parameternames{ii} "=" num2str(parameters(ii)) ";"])
endfor
vp = extvar(1);
vm = extvar(2);
[I,g] = Mpdesympnjunct (len,Dope,vp-vm,Area,Nnodes,toll,maxit,ptoll,pmaxit);
a = zeros(2);
b = [g -g; -g g];
c = [I ; -I] ;
break
otherwise
error(["unknown section:" string])
endswitch
endfunction
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