By W. L. Engl
This e-book is the 1st of a brand new, seven quantity sequence which goals to supply a entire description of easy tools and applied sciences concerning CAD for VLSI. The sequence contains updated effects and most up-to-date advancements, with a very good stability among theoretical and useful features of VLSI layout. during this quantity emphasis is put on the fundamentals of modeling, the hole chapters being dedicated to basic strategy and gadget modeling. the next chapters hide diversified features of gadget modeling and in addition bridge to procedure simulation at the one aspect, and circuit simulation at the different. A platforms method of actual modeling, spanning the full diversity of issues lined, is usually handled. contemporary meetings at the topic have signalled that actual modeling mixed with know-how, gadget and circuit optimization, will unquestionably turn into an incredible pattern sooner or later.
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Targeting second-order loops, this advent to ideas that may be utilized to quite a lot of section- locked loop circuits is supplemented through a couple of MATLABR simulation routines that permit the reader to extend his or her wisdom of the circuit layout technique. Twenty chapters discover such themes as: loop elements, reaction, and balance; temporary and modulation reaction; acquisition; part modulation by means of noise; reaction to noise modulation, illustration of and loop reaction to additive noise; and parameter edition, nonlinear operation, and cycle skipping because of noise.
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Additional info for Process and Device Modeling
There are eight distinct places in the design cycle where SI analysis can be performed, but not all are performed on a specific product or by an individual engineer. • Good EMI test results begin with good SI. • Performing SI analysis late, after the product has been released to production, is costly and time-consuming. 20 The Signal Integrity Process • Patterns and environmental configurations identified during simulation can be used to test actual hardware during DVT and debug. • SI analysis identifies design vulnerabilities in the design and shows where the debug activities should be targeted.
In the past, the strategy of creating a single test and evaluation board made economic sense when circuit board artwork could only be created by layout specialists and when fabricating and assembly shops were reluctant to take on small sized orders. While it is true that the routing of high-speed, high-performance circuit boards is best left to experienced specialists, the proliferation of layout design CAD tools (some of which include auto routing software that is driven from the schematic to 34 Printed Test and Evaluation Boards route traces automatically) makes it possible for the skilled signal integrity engineer to lay out simple, small, multilayer circuit boards for customer use.
Some CAD tools support postlayout analysis, so if properly set up during prelayout, the completed layout database can quickly be automatically analyzed for compliance and timing. Although this provides an enormous time savings, especially on large multilayer boards, these tools are no substitute for a detailed visual inspection of the artwork (and the SI engineer should always insist on having enough time in the schedule to do this). The layout designer changes those things identified by the CAD and visual inspections, and the SI engineer reexamines the artwork.