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       1                 :            : /*
       2                 :            :  * itrafo.cpp - ideal trafo class implementation
       3                 :            :  *
       4                 :            :  * Copyright (C) 2003, 2004, 2008 Stefan Jahn <stefan@lkcc.org>
       5                 :            :  *
       6                 :            :  * This is free software; you can redistribute it and/or modify
       7                 :            :  * it under the terms of the GNU General Public License as published by
       8                 :            :  * the Free Software Foundation; either version 2, or (at your option)
       9                 :            :  * any later version.
      10                 :            :  *
      11                 :            :  * This software is distributed in the hope that it will be useful,
      12                 :            :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13                 :            :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14                 :            :  * GNU General Public License for more details.
      15                 :            :  *
      16                 :            :  * You should have received a copy of the GNU General Public License
      17                 :            :  * along with this package; see the file COPYING.  If not, write to
      18                 :            :  * the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
      19                 :            :  * Boston, MA 02110-1301, USA.
      20                 :            :  *
      21                 :            :  * $Id$
      22                 :            :  *
      23                 :            :  */
      24                 :            : 
      25                 :            : #if HAVE_CONFIG_H
      26                 :            : # include <config.h>
      27                 :            : #endif
      28                 :            : 
      29                 :            : #include "component.h"
      30                 :            : #include "itrafo.h"
      31                 :            : 
      32                 :            : using namespace qucs;
      33                 :            : 
      34                 :         40 : itrafo::itrafo () : circuit (3) {
      35                 :         40 :   type = CIR_ITRAFO;
      36                 :         40 : }
      37                 :            : 
      38                 :         40 : void itrafo::initSP (void) {
      39                 :         40 :   allocMatrixS ();
      40                 :         40 :   nr_double_t z = getPropertyDouble ("Z");
      41                 :         40 :   nr_double_t n = 2 * z0 + z;
      42         [ +  - ]:         40 :   setS (NODE_1, NODE_1,  (2.0 * z0 - z) / n);
      43         [ +  - ]:         40 :   setS (NODE_1, NODE_2,  (2.0 * std::sqrt (z0 * z)) / n);
      44         [ +  - ]:         40 :   setS (NODE_1, NODE_3, -(2.0 * std::sqrt (z0 * z)) / n);
      45         [ +  - ]:         40 :   setS (NODE_2, NODE_1,  (2.0 * std::sqrt (z0 * z)) / n);
      46         [ +  - ]:         40 :   setS (NODE_2, NODE_2,  (z) / n);
      47         [ +  - ]:         40 :   setS (NODE_2, NODE_3,  (2.0 * z0) / n);
      48         [ +  - ]:         40 :   setS (NODE_3, NODE_1, -(2.0 * std::sqrt (z0 * z)) / n);
      49         [ +  - ]:         40 :   setS (NODE_3, NODE_2,  (2.0 * z0) / n);
      50         [ +  - ]:         40 :   setS (NODE_3, NODE_3,  (z) / n);
      51                 :         40 : }