System Level Mixed-Signal Modeling in Ptolemy II
| Researchers: |
Jie Liu |
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| Advisor: | Edward A. Lee |
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| Sponsor: |
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This work studies and implements continuous time system modeling and
simulation in Ptolemy II. In the continuous time model, a system is described in
a set of ordinary differential equations (ODE). Differing from the nodal
analysis representation in circuit simulation tools like SPICE, the ODEs are
represented in Ptolemy II as integrators with feedback loops. This
representation is close to the mathematical formulation, thus is suitable for
problem level specifications. Various numerical ODE solving methods are studied
and implemented, including the Forward Euler, Backward Euler, Trapezoidal Rule,
and the Runge-Kutta methods. The formal semantics and the interaction with other
models of computation are the central parts of this work. The models of
computation of special interests to interact with are the discrete event models,
the dataflow models and the finite state machine models. Typical applications
are mixed-signal electronic systems, microelectromechanical systems, real-time
control systems, and hybrid systems.
Last updated 03/22/99