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BUGS
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BUGS
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--
-- BUGS
--
-- Copyright (C) 2003, 2004, 2005 Stefan Jahn <[email protected]>
--
-- This 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, or (at your option)
-- any later version.
--
-- This software 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 package; see the file COPYING. If not, write to
-- the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
-- Boston, MA 02110-1301, USA.
--
This file is intended to collect all known bugs (fixed or unfixed) in
this package. We will consider fixing these sooner or later. Please
send Qucs bug reports to <[email protected]>.
Bug: B0001
From: Stefan Jahn <[email protected]>
State: fixed (2004-10-19/stefan)
Date: 2004-09-01
Description: Parallel coupled microstrip models do not work. In fact the
characteristic impedances for even and odd mode are wrong.
Fix: Found the appropriate publication by Kirschning.
Bug: B0002
From: Stefan Jahn <[email protected]>
State: fixed (2005-05-12/stefan)
Date: 2005-03-01
Description: Depending on the netlist input order it may occur that a DC
analysis converges or does not converge (under-determined
equation system?).
Fix: The example netlists I had for this case are almost
rank-deficient MNA matrices. Thus another, numerically more
stable, matrix decomposition algorithm has been implemented:
the QR decomposition using Householder transformations. The
solution algorithm can now be chosen. The new algorithm is
now able to solve the test-cases - LU decomposition was not.
Bug: B0003
From: Stefan Jahn <[email protected]>
State: fixed (2005-03-08/stefan)
Date: 2005-03-01
Description: Noise correlation matrices of microstrip components can't be
calculated assuming a simple attenuation because of the
transition time effects.
Fix: The calculation is performed using Bosma's theorem.
Bug: B0004
From: Stefan Jahn <[email protected]>
State: fixed (2005-03-08/stefan)
Date: 2005-03-01
Description: AC output resistance of the BJT model is much too high.
Fix: Use conservative small signal equivalent circuit description
instead of the 'NEWSGP' which works nice for DC calculation
anyway.
Bug: B0005
From: Stefan Jahn <[email protected]>
State: unfixed
Date: 2007-12-30
Description: Empty subcircuit definitions in conjunction with duplicate
nodes in the nodelist (shorted nodes) cause the simulator
to withdraw the netlist.