By Henry Chang, Edoardo Charbon, Umakanta Choudhury, Alper Demir, Eric Felt, Edward Liu, Enrico Malavasi, Alberto Sangiovanni-Vincentelli, Iasson Vassiliou
Analog circuit layout is frequently the bottleneck whilst designing combined analog-digital platforms. A Top-Down, Constraint-Driven DesignMethodology for Analog built-in Circuits offers a brand new technique in accordance with a top-down, constraint-driven layout paradigm that offers an answer to this challenge. this technique has crucial benefits: (1) it offers a excessive likelihood for the 1st silicon which meets all standards, and (2) it shortens the layout cycle.
A Top-Down, Constraint-Driven layout technique for Analog IntegratedCircuits is a part of an ongoing learn attempt on the college of California at Berkeley within the electric Engineering and desktop Sciences division. Many college and scholars, prior and current, are engaged on this layout method and its helping instruments. The significant targets are: (1) constructing the layout technique, (2) constructing and making use of new instruments, and (3) `proving' the method by means of project `industrial power' layout examples. The paintings awarded this is neither a starting nor an lead to the improvement of a whole top-down, constraint-driven layout technique, yet particularly a step in its improvement.
This paintings is split into 3 components. bankruptcy 2 provides the layout technique besides origin fabric. Chapters 3-8 describe assisting recommendations for the method, from behavioral simulation and modeling to circuit module turbines. eventually, Chapters Sept. 11 illustrate the method intimately by way of providing the total 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 driving force approach. bankruptcy 12 offers conclusions and present learn themes.
A Top-Down, Constraint-Driven layout technique for Analog IntegratedCircuits might be of curiosity to analog and mixed-signal designers in addition to CAD device developers.
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Extra info for A Top-Down, Constraint-Driven Design Methodology for Analog Integrated Circuits
For example, a veilage reference circuit is found in our cell library. Thus, the decomposition of this nod e is notnecessary. A solidline underthe terminating nodeindicates this. In somecases the decomposition does not ceaseuntilthe transistor or passive element level, as indicated by the capacitors and the MOSFETs in this figure. 17, assists the hierarchical generation of the design by providing a rigorous procedure based on interactive and automatic tools. The large bubble encompassing most of the diagram represents the mapping.
The full scale range is 7/ 8 Ire! 2 000 converts to 00 0000 0 0. The 2 nth unused current source is often kept for matching and symmetry reasons. 6 were truly identical and had infinite output resistances, then this technique could be applied to build arbitrarily accurate D/A converters. e. , and placed within close proximity, transistors do not behave identically. g. gate oxide thickness variations, lithographic variations, substrate doping variations, surface gradients, and temperature gradients  .
In Simulation and Behavioral Modeling 43 , the designer provides a transistor-level description of the circuit block under consideration, a time-domain macromodel with a number of adjustable parameters, and a set of target specifications. The input excitations used to verify the transistor circuit and a reasonable range for each parameter are also provided by the user. Parameters of the macromodel are optimized to minimize the "difference" between the waveforms obtained from the macromodel and the transistor-level circuit.