This paper describes how a state of the art successfu~'y incorporated into a 0'6um process' The circuits or cells designed on either process can be realized on the new process.ple where possible the interaction of the CMOS devices with the bipolar devices. For example, neither the MOS gate for the polysilicon layers of the bipolar transistor as all these cies and sheet resistances. To combine these would require an unacceptable level of compromise on device paramebipolar process designed for R F applications has been po~ysi~icon nor the top capacitor polysilicon were used resultant BiCMoS process has the feature that products, po~ysi~icon layers are incompatible in terms of dopant spe-
Semiconductor factories are very expensive to build and operate. It is critical to understand how to design and operate them efficiently. We describe a simulation model of a planned 300mm wafer fabrication line that we are using to make strategic decisions related to the factory.
Increased product and process diversity in semiconductor manufacturing line has confronted the operations managers with the challenge of managing the setups that usually accompany changes of processes or products at a machine.Recall that under a flexible manufacturing regime, a setup is employed prior to processing in order to prepare the machine with the specific recipe required by the job at hand. Such a setup is performed only if the job last processed by the machine utilized a different recipe.One way to curtail setups is to divide like machines into groups and dedicate each group of machines to one (or a small number) of recipes. These machine-to-recipe dedications are aimed to eliminate (or reduce) the setups and hence improve productivity. However, these dedications also result in reduced flexibility at operation time and hence serve as a detractor to productivity. To investigate this trade off and evaluate the net effect on productivity, an analytical tool was developed at IBM Microelectronics. In our first set of experiments we confined ourselves to the cases where the number of recipes were equal to the number of machines at the workstation under study. We found that the aforementioned trade off depends largely on two factors: ratio of setup duration to processing duration, and the scheduling policy (Rohan, Proceedings of the 1999 Western MultiConference).. This elucidated that the dedication decisions should be independent of the absolute values of setup duration or process duration. Our experiments also indicated that the corresponding break-even points were fairly insensitive to the number of recipes (or machines). In this paper we will relax our assumption regarding recipe to machine equality.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.