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Circuit optimization via sequential computer experiments: design of an output buffer

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In electrical engineering, circuit designs are now often optimized via circuit simulation computer models. Typically, many response variables characterize the circuit’s performance. Each response is a function of many input variables, including factors that can be set in the engineering design and noise factors representing manufacturing conditions. We describe a modelling approach which is appropriate for the simulator’s deterministic input–output relationships. Non-linearities and interactions are identified without explicit assumptions about the functional form. These models lead to predictors to guide the reduction of the ranges of the designable factors in a sequence of experiments. Ultimately, the predictors are used to optimize the engineering design. We also show how a visualization of the fitted relationships facilitates an understanding of the engineering trade-offs between responses. The example used to demonstrate these methods, the design of a buffer circuit, has multiple targets for the responses, representing different trade-offs between the key performance measures.
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Keywords: Circuit simulator; Computer code; Computer model; Engineering design; Parameter design; Stochastic process; Visualization

Document Type: Original Article

Affiliations: 1: Intel Corporation, Hillsboro, USA, 2: Western Michigan University, Kalamazoo, USA, 3: Intel Corporation, Santa Clara, USA, 4: National Institute of Statistical Sciences, Research Triangle Park, USA, 5: University of Waterloo, Canada

Publication date: 1998-01-01

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