The development and production of well-performing and inexpensive microsensors, actuators or complete microsystems are largely determined by intricate trade-off considerations. Optimum performance requires a judicious...
详细信息
The development and production of well-performing and inexpensive microsensors, actuators or complete microsystems are largely determined by intricate trade-off considerations. Optimum performance requires a judicious design based on a detailed understanding of the physical phenomena which govern the operation of single system components as well as their cooperation. To this purpose, modeling and numerical simulation are regarded as increasingly useful or even as indispensable. Problem-oriented modeling does not only reduce the number of costly and time-consuming experimental trial-and-error steps, but it also lends unique insight into the interior of a miniaturized device showing the distributions of various physical quantities which are not readily accessible to experiments. Future work has mostly to concentrate on a user-friendly modular 'CAD tool box' based on the concepts of 'tailored modeling'. This implies not only modem flexible software techniques and highly efficient computational methods, but in particular new methodologies for fast and reliable model validation and the availability of a process-oriented material-property data base.
With the rapid development of solid state technology, the clock speed and integration density of very large integration (VLSI) chips and multichip modules (MCMs) have been increasing steadily. The clock rate has incre...
With the rapid development of solid state technology, the clock speed and integration density of very large integration (VLSI) chips and multichip modules (MCMs) have been increasing steadily. The clock rate has increased from several MHz to the GHz range. At such high frequencies, the interconnects behave like transmission lines and waveguides. As a result, the traditional lumped element models are no longer applicable, rendering an urgent need for electromagnetic modeling, analysis, design and simulation methods of high speed and wideband microelectronics. In this dissertation, two important structures in modern microelectronic packaging, namely the fuzz button vertical interconnects and meshed ground planes, are studied by the quasi-static and full wave approaches, respectively. The newly developed wavelet theory is applied to the numerical computation of electromagnetic problems. A wavelet-based bi-orthonormal decomposition method is proposed and studied. Finally, numerical examples and real world problems are provided and solved. Laboratory measurements are conducted. The results of the examples in this dissertation are compared with previous publications and laboratory tests, and good agreement is observed.
The gateway technique is a method for switching segments of code into and out of the instruction stream. When added to the straight-line code generated by a compiled simulator, gateways can be used to enhance the perf...
详细信息
The gateway technique is a method for switching segments of code into and out of the instruction stream. When added to the straight-line code generated by a compiled simulator, gateways can be used to enhance the performance of the generated code by switching only those segments of code that actually need to be executed into the instruction stream. The convergence algorithm is an oblivious compiled code algorithm that can be used with many different types of circuits, including cyclic asynchronous circuits. In its oblivious form, the convergence algorithm provides only modest gains in performance over interpreted event-driven simulation, but with the addition of gateways, the performance of the algorithm increases significantly. Experimental data shows that with gateways, the convergence algorithm runs in about 1/5th the time required for an interpreted event-driven simulation. Additional work has been done to reduce the amount of code generated by the convergence algorithm, and to enhance the locality of the code to improve its performance on machines with caches. When used with a multi-delay algorithm, gateways allow simulations to be performed in 1/3 the time required by interpreted simulations. Gateways also allow zero-delay simulations to be more responsive to the activity rate of the circuit, and allow event driven simulations to outperform levelized compiled code when the activity rate of the circuit falls below 13%.
A hybrid simulator suitable for modeling small semiconductor devices has been developed in which Monte Carlo and drift-diffusion models are combined. In critical device regions, the position-dependent coefficients of ...
详细信息
A hybrid simulator suitable for modeling small semiconductor devices has been developed in which Monte Carlo and drift-diffusion models are combined. In critical device regions, the position-dependent coefficients of an extended drift-diffusion equation are extracted from a Monte Carlo simulation. Criteria for identifying these regions are described. Additional features which make the code more efficient are presented. First, a free-flight time calculation method using a new self-scattering algorithm is described. It allows for an efficient reduction of self-scattering events. Second, a unique Monte Carlo Poisson coupling scheme has been developed which converges faster than all presently known schemes. It exploits the so-called Monte Carlo-drift diffusion coupling technique, which also forms the basis of the hybrid method. The simulator has been used to model submicron MOSFET's with gate lengths down to 0.15 mu m. In addition to the non-local effects occurring in these devices, the performance of the hybrid simulation method is analyzed.
With the rapid development of solid state technology, the clock speed and integration density of very large integration (VLSI) chips and multichip modules (MCMs) have been increasing steadily. The clock rate has incre...
With the rapid development of solid state technology, the clock speed and integration density of very large integration (VLSI) chips and multichip modules (MCMs) have been increasing steadily. The clock rate has increased from several MHz to the GHz range. At such high frequencies, the interconnects behave like transmission lines and waveguides. As a result, the traditional lumped element models are no longer applicable, rendering an urgent need for electromagnetic modeling, analysis, design and simulation methods of high speed and wideband microelectronics. In this dissertation, two important structures in modern microelectronic packaging, namely the fuzz button vertical interconnects and meshed ground planes, are studied by the quasi-static and full wave approaches, respectively. The newly developed wavelet theory is applied to the numerical computation of electromagnetic problems. A wavelet-based bi-orthonormal decomposition method is proposed and studied. Finally, numerical examples and real world problems are provided and solved. Laboratory measurements are conducted. The results of the examples in this dissertation are compared with previous publications and laboratory tests, and good agreement is observed.
This document describes several effective Verilog coding techniques which, by increasing simulation performance, enables a seamless migration of a large scale electronic system through a wide range of abstraction for ...
详细信息
ISBN:
(纸本)0818656557
This document describes several effective Verilog coding techniques which, by increasing simulation performance, enables a seamless migration of a large scale electronic system through a wide range of abstraction for both the system description and the simulated verification. These coding techniques support the maintenance of design integrity during either forward or backward abstraction migration. This is accomplished by supporting mixed levels of detail for different system functions, and for the same system function at different time periods, during simulation.
A program to implement the Recursive Scaled Discrete Cosine Transform (DCT) algorithm as proposed by H. S. Hou has been undertaken at the Institute of microelectronics. Implementation of the design was done using top-...
详细信息
ISBN:
(纸本)0819414824
A program to implement the Recursive Scaled Discrete Cosine Transform (DCT) algorithm as proposed by H. S. Hou has been undertaken at the Institute of microelectronics. Implementation of the design was done using top-down design methodology with VHDL (VHSIC Hardware Description Language) for chip modeling. When the VHDL simulation has been satisfactorily completed, the design is synthesized into gates using a synthesis tool. The architecture of the design consists of two processing units together with a memory module for data storage and transpose. Each processing unit is composed of four pipelined stages which allow the internal clock to run at one-eighth (1/8) the speed of the pixel clock. Each stage operates on eight pixels in parallel. As the data flows through each stage, there are various adders and multipliers to transform them into the desired coefficients. The Scaled IDCT was implemented in a similar fashion with the adders and multipliers rearranged to perform the inverse DCT algorithm. The chip has been verified using Field Programmable Gate Array devices. The design is operational. The combination of fewer multiplications required and pipelined architecture give Hou's Recursive Scaled DCT good potential of achieving high performance at a low cost in using Very Large Scale Integration implementation.
In order to meet the requirements of advanced process and device design, a new generation of technology CAD (TCAD) simulation frameworks is emerging. These are based on a data level providing a common data interchange...
详细信息
In order to meet the requirements of advanced process and device design, a new generation of technology CAD (TCAD) simulation frameworks is emerging. These are based on a data level providing a common data interchange format. Such a format must be suitable for building simulation databases, and needs to be supported by tools and a procedural interface with multi-language bindings for data storage and retrieval by application programs. In this work, the data level of the Viennese integrated system for TCAD applications (VISTA), which includes the profile interchange format (PIF), the PIF binary file manager (PBFM) and the PIF application interface (PAI), is described from a framework point of view.< >
This paper describes several effective Verilog coding techniques which, by increasing simulation performance, enable a seamless migration of a large scale electronic system through a wide range of abstraction for both...
详细信息
This paper describes several effective Verilog coding techniques which, by increasing simulation performance, enable a seamless migration of a large scale electronic system through a wide range of abstraction for both the system description and the simulated verification. These coding techniques support the maintenance of design integrity during either forward or backward abstraction migration. This is accomplished by supporting mixed levels of detail for different system functions, and for the same system function at different time periods, during simulation.< >
暂无评论