Behrooz Abdi

Application of statistical design and response surface methods to computer-aided VLSI device design

A statistically oriented methodology for optimization and sensitivity analysis of VLSI process, device, and circuit design through computer simulation has been developed. Emphasis has been placed on maintaining a clear distinction between design synthesis and design analysis. Design analysis is viewed as a multiple input-output system resulting in a multiple-constraints-optimization problem. It is shown how simple graphic techniques or rigorous mathematical optimization can be performed within a constrained desirability space to determine optimal operating conditions. This leads directly to the concept of global input factors. Which affect a large number of the response variables, and specific input factors, which can be used to adjust the operating level of a small number of response variables. By using the derived empirical equations to desensitize the responses to variations in input factors, the proposed methodology can play a key role in designing for manufacturability. As proof of concept, the methodology has been applied to the optimization of a VLSI BIMOS technology, with satisfactory results. >

A process and geometry driven device macro model for statistical simulation of bipolar ICs

A method of modeling bipolar semiconductor devices for circuit simulation is presented. Device layout geometric differences are accurately included in circuit simulation models without requiring a separate model for each layout geometry. To ensure that the simulated results closely match the measured performance, all parasitic junctions and capacitances are modeled in detail by utilizing subcircuit macros. Functional model parameters allow statistical circuit simulation from uncorrelated process parameters.<<ETX>>

The world-wide wireless web

The world-wide wireless web is the promise of delivering the desktop experience to the mobile society. This is a promise of seamless connectivity and multimedia interactivity while on the move. This promise is driving convergence of demand for high speed wireless data with the demand for greater convenience, greater access, and greater, more visual and dynamic content, all without compromising the security and bit error rate performance that we have come to expect in the wired world.