Marina Zanella - Academia.edu (original) (raw)
Uploads
Papers by Marina Zanella
The authors discuss an expert system, called AUSPICE, which gives assistance to the user of the S... more The authors discuss an expert system, called AUSPICE, which gives assistance to the user of the SPICE circuit simulator. AUSPICE has the knowledge of an expert in both circuit and numerical problems applied to electrical simulation, and is capable of finding a way out of nonconvergence cases as well as some circuit specification mistakes. An expert system running both on a personal computer and on a DEC VAX was developed, using a goal-driven shell. Another expert system running on a VAX and using a production system is now being tested. The ultimate goal of the project is to integrate AUSPICE into a SPICE environment. Knowledge representation schemes, inference mechanisms, and significant operating examples are presented.>
Some of the most important requirements of design management, as it is applied to an engineering ... more Some of the most important requirements of design management, as it is applied to an engineering environment in which semicustom IC design is produced, are detailed. Requirements are expressed in a way suitable for conversion into software specifications. A simple model which tries to fulfil most of these requirements is also presented. A detailed account of the requirements is given from the user point of view. The list of requirements is then interpreted with basic framework in mind
Computer-aided Design, 1996
is a very important topic for every state-of-the-art CAD/WE environment.
Experimental evidence shows that the usage of MOS transistor charge-control models in the SPICE c... more Experimental evidence shows that the usage of MOS transistor charge-control models in the SPICE circuit simulator may cause trouble in transient analysis, independent of the dimensions of the circuits. If the trapezoidal integration method is adopted for the branch currents' computation of an MOS circuit in transient analysis, the solution sometimes oscillates indefinitely, alternating a positive error and a negative error at each SPICE internal time point. Device models and numerical algorithms have been taken into account in order to determine the causes of this behavior. The trapezoidal method has been identified as the main factor responsible for wrong outputs while Gear methods recover from errors in a finite number of steps
The authors discuss an expert system, called AUSPICE, which gives assistance to the user of the S... more The authors discuss an expert system, called AUSPICE, which gives assistance to the user of the SPICE circuit simulator. AUSPICE has the knowledge of an expert in both circuit and numerical problems applied to electrical simulation, and is capable of finding a way out of nonconvergence cases as well as some circuit specification mistakes. An expert system running both on a personal computer and on a DEC VAX was developed, using a goal-driven shell. Another expert system running on a VAX and using a production system is now being tested. The ultimate goal of the project is to integrate AUSPICE into a SPICE environment. Knowledge representation schemes, inference mechanisms, and significant operating examples are presented.>
Some of the most important requirements of design management, as it is applied to an engineering ... more Some of the most important requirements of design management, as it is applied to an engineering environment in which semicustom IC design is produced, are detailed. Requirements are expressed in a way suitable for conversion into software specifications. A simple model which tries to fulfil most of these requirements is also presented. A detailed account of the requirements is given from the user point of view. The list of requirements is then interpreted with basic framework in mind
Computer-aided Design, 1996
is a very important topic for every state-of-the-art CAD/WE environment.
Experimental evidence shows that the usage of MOS transistor charge-control models in the SPICE c... more Experimental evidence shows that the usage of MOS transistor charge-control models in the SPICE circuit simulator may cause trouble in transient analysis, independent of the dimensions of the circuits. If the trapezoidal integration method is adopted for the branch currents' computation of an MOS circuit in transient analysis, the solution sometimes oscillates indefinitely, alternating a positive error and a negative error at each SPICE internal time point. Device models and numerical algorithms have been taken into account in order to determine the causes of this behavior. The trapezoidal method has been identified as the main factor responsible for wrong outputs while Gear methods recover from errors in a finite number of steps