--- /dev/null
+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);
+