A Top-Down, Constraint-Driven Design Methodology for Analog by Henry Chang, Edoardo Charbon, Umakanta Choudhury, Alper

By Henry Chang, Edoardo Charbon, Umakanta Choudhury, Alper Demir, Eric Felt, Edward Liu, Enrico Malavasi, Alberto Sangiovanni-Vincentelli, Iasson Vassiliou

Analog circuit layout is usually the bottleneck while designing combined analog-digital structures. A Top-Down, Constraint-Driven DesignMethodology for Analog built-in Circuits provides a brand new technique according to a top-down, constraint-driven layout paradigm that offers an answer to this challenge. this technique has relevant benefits: (1) it presents a excessive chance for the 1st silicon which meets all requirements, and (2) it shortens the layout cycle.
A Top-Down, Constraint-Driven layout technique for Analog IntegratedCircuits is a part of an ongoing examine attempt on the collage of California at Berkeley within the electric Engineering and desktop Sciences division. Many school and scholars, prior and current, are engaged on this layout method and its aiding instruments. The vital ambitions are: (1) constructing the layout method, (2) constructing and using new instruments, and (3) `proving' the method by way of project `industrial energy' layout examples. The paintings awarded this is neither a starting nor an result in the advance of a whole top-down, constraint-driven layout technique, yet really a step in its improvement.
This paintings is split into 3 elements. bankruptcy 2 provides the layout method in addition to origin fabric. Chapters 3-8 describe aiding techniques for the technique, from behavioral simulation and modeling to circuit module turbines. eventually, Chapters September 11 illustrate the method intimately by means of featuring the full layout cycle via 3 large-scale examples. those comprise the layout of a present resource D/A converter, a Sigma-Delta A/D converter, and a video motive force approach. bankruptcy 12 provides conclusions and present learn subject matters.
A Top-Down, Constraint-Driven layout method for Analog IntegratedCircuits may be of curiosity to analog and mixed-signal designers in addition to CAD software developers.

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The phrase "behavioral modeling" will be reserved for a new "high-level" modelingconcept that is significantly different from macromodeling. Some attributes of macromodeling are listed below: • Macromodels reducesimulation timebecause ofreduced circuit size, but a macromodel accurate for a variety of input conditions has from a third to a half of the number of elements of the original circuit [176] . As a result, simulation time reducti on is not satisfactory. • Creation of macromodels for general nonlinear circuits depends heavily on the experience of the designer, even though there are some techniques [33][145] which facilitate macromodel verification and optimization.

Instead, we will workclosely with industry to use whatever language willbe considered standard to describe ourmodels. We willprovide feedback todefine someaspects of thelanguage that maymakemodels easiertodescribe and manipulate. Ouremphasis is on the mathematical aspects of analog behavioral modeling andsimulation . In analog behavioral modeling and simulation research, we believe that the real added value is in creating realistic models of circuitcomponents which captureanalog second-order effects using the most suitable mathematical techniques.

There is a great deal of activity to develop a standard analog hardware description language. Most of the analog "multi-level" simulators are associated with an AHDL. An AHDL for high-performance analog and mixed-signal design must provide full support to represent the analog second-order effects such as noise, distortion and statistical variations. There should be constructs for representation of models to be used in statistical/noise simulations using Monte Carlo and especially non-Monte Carlo techniques.

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