Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / secs2d-0.0.8 / Utilities / Udriftdepmob.m

diff --git a/octave_packages/secs2d-0.0.8/Utilities/Udriftdepmob.m b/octave_packages/secs2d-0.0.8/Utilities/Udriftdepmob.m
new file mode 100644 (file)
index 0000000..40990e5
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+++ b/octave_packages/secs2d-0.0.8/Utilities/Udriftdepmob.m
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+function mob = Udriftdepmob(imesh,u0,F,V,vsat,b)
+
+  
+% mob = Ufielddepmob(imesh,u0,F,vsat,b) 
+% Computes field dependent mobility
+  
+% This file is part of 
+%
+%            SECS2D - A 2-D Drift--Diffusion Semiconductor Device Simulator
+%         -------------------------------------------------------------------
+%            Copyright (C) 2004-2006  Carlo de Falco
+%
+%
+%
+%  SECS2D 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 2 of the License, or
+%  (at your option) any later version.
+%
+%  SECS2D 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 SECS2D; If not, see <http://www.gnu.org/licenses/>.
+
+
+
+  [Ex,Ey]= Updegrad(imesh,-V);
+  [Fx,Fy]= Updegrad(imesh,F);
+  fnmod  = sqrt(Fx.^2+Fy.^2);
+  ef     = abs(Fx.*Ex+Fy.*Ey)./fnmod;
+  
+  if Ucolumns(ef)>Urows(ef)
+    ef=ef';
+  end
+  
+  mob = u0 ./ (1+(u0 .* ef ./ vsat).^b).^(1/b);
+