Welcome to the MMTL homepage.
MMTL, the Multilayer Multiconductor Transmission Line
2-D and 2.5-D electromagnetic modeling tool suite, generates
transmission parameters and SPICE models from descriptions of
electronics interconnect dimensions and materials properties.
MMTL programs and supporting libraries and documentation have been
under development at the Mayo Clinic since the mid-1980s. The
programs were developed under government sponsored electronics
research programs in the Special Purpose Processor Development Group
(SPPDG). They have been employed extensively at Mayo and distributed
to some government agencies and research collaborators. At the
beginning of 2004, we decided to release the TNT graphical front-end
and MMTL programs as free software under the GNU General
Public License (GPL).
Technically, MMTL programs are in the class of 2-D and 2.5-D "field
solvers", which convert dimensions and materials properties into
electronic design parameters. The MMTL suite consists of several
programs, including lossy, loss-free, quasi-static, and full-wave
simulators. Circuit parameters are computed by either the method of
moments (MOM) or finite element methods (FEM). Basic per-unit-length
parameters are generated by the simulator, and can be converted into
HSPICE W-element models.
MMTL is similar in many ways to commercial field solver products which
typically cost thousands of dollars. There are some free calculators,
such as those from UltraCAD, but they rely on simplified formulas for
specific cases, instead of generalized electromagnetic modeling.
MMTL is implemented in C, C++, FORTRAN, sh, and Tcl/Tk, and has been
deployed on HP-UX, Linux, Windows, Solaris, and Alpha/OSF1. Please
visit the Sourceforge
project page for details.