/usr/share/octave/packages/ocs-0.1.3/sbn/Mnmosfet.m is in octave-ocs 0.1.3-1build1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 | ## Copyright (C) 2006,2007,2008 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: Carlo de Falco <cdf _AT_ users.sourceforge.net>
## -*- texinfo -*-
##
## @deftypefn{Function File} @
## {[@var{a},@var{b},@var{c}]=}Mnmosfet(@var{string},@var{parameters},@
## @var{parameternames},@var{extvar},@var{intvar},@var{t})
##
## SBN file implementing standard models for n-mosfets.
##
## @var{string} is used to select among models. Parameters are listed
## as inner items. Possible models are:
##
## @enumerate
## @item @var{string} = "simple" (Standard model for MOSFET)
## @itemize @minus
## @item rd -> parasitic resistance between drain and source
## @item k -> k parameter for usual mosfet model
## @item Vth -> threshold voltage
## @end itemize
## @item @var{string} = "lincap" (Adds RC parasitics)
## @itemize @minus
## @item rd -> parasitic resistance between drain and source
## @item k -> k parameter for usual mosfet model
## @item Vth -> threshold voltage
## @item Rs -> parasitic source resistance
## @item Rd -> parasitic drain resistance
## @item Cs -> gate-source capacitance
## @item Cd -> gate-drain capacitance
## @item Cb -> gate-bulk capacitance
## @end itemize
## @end enumerate
##
## 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]=Mnmosfet(string,parameters,parameternames,extvar,intvar,t)
switch string
case "simple"
rd = 1e6;
k = 1e-5;
Vth = .5;
for ii=1:length(parameternames)
eval([parameternames{ii} "=",...
num2str(parameters(ii)) " ;"])
endfor
vg = extvar(1);
vs = extvar(2);
vd = extvar(3);
vb = extvar(4);
vgs = vg-vs;
vds = vd-vs;
if (vgs < Vth)
gm = 0;
gd = 1/rd;
id = vds*gd;
elseif (((vgs-Vth) >= (vds)) && (vds>=0))
id = k*((vgs-Vth)*vds-(vds^2)/2)+vds/rd;
gm = k*vds;
gd = k*(vgs-Vth-vds)+1/rd;
elseif (((vgs-Vth) >= (vds)) && (vds<0))
gm = 0;
gd = 1/rd;
id = vds*gd;
else # (i.e. if 0 <= vgs-vth <= vds)
id = (k/(2))*(vgs-Vth)^2+vds/rd;
gm = (2*k/(2))*(vgs-Vth);
gd = 1/rd;
endif
a = zeros(4);
b = [0 0 0 0;
-gm (gm+gd) -gd 0;
gm -(gm+gd) gd 0;
0 0 0 0];
c = [0 -id id 0]';
break;
case "lincap"
## Default parameter values
if isempty(intvar)
intvar = zeros(5,1);
endif
Rs = 1e2; Rd = 1e2; Cs = 1e-15;
Cd = 1e-15; Cb = 1e-14;
rd = inf; k = 1e-3; Vth = .1;
## parameters given in input
for ii=1:length(parameternames)
eval([parameternames{ii} "=",...
num2str(parameters(ii)) " ;"])
endfor
persistent tmpstruct
if isempty(tmpstruct)
mtdnmos = file_in_path(path,"Mtdnmos.cir");
mtdnmos(end-3:end)=[];
tmpstruct = prs_iff(mtdnmos);
endif
tmpstruct.NLC.pvmatrix = [k Vth rd];
tmpstruct.LCR(1).pvmatrix = [Rs; Rd];
tmpstruct.LCR(2).pvmatrix = [Cs; Cd; Cb];
[A0,B,C] = asm_initialize_system(tmpstruct,[extvar;intvar]);
[A1,Jac,res] = asm_build_system(tmpstruct,[extvar;intvar],t);
a = A0+A1;
b = B+Jac;
c = res + B*[extvar;intvar] + C;
break;
otherwise
error(["unknown option:" string]);
endswitch
endfunction
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