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 structures. A Top-Down, Constraint-Driven DesignMethodology for Analog built-in Circuits provides a brand new technique in response to a top-down, constraint-driven layout paradigm that gives an answer to this challenge. this system has crucial benefits: (1) it offers a excessive likelihood for the 1st silicon which meets all requisites, 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 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 primary targets are: (1) constructing the layout technique, (2) constructing and using new instruments, and (3) `proving' the method through venture `industrial energy' layout examples. The paintings provided here's neither a starting nor an lead to the improvement of an entire top-down, constraint-driven layout technique, yet fairly a step in its improvement.
This paintings is split into 3 elements. bankruptcy 2 offers the layout method in addition to origin fabric. Chapters 3-8 describe assisting recommendations for the technique, from behavioral simulation and modeling to circuit module turbines. ultimately, Chapters 9/11 illustrate the technique intimately by way of offering the full layout cycle via 3 large-scale examples. those contain the layout of a present resource D/A converter, a Sigma-Delta A/D converter, and a video motive force approach. bankruptcy 12 offers conclusions and present study issues.
A Top-Down, Constraint-Driven layout technique for Analog IntegratedCircuits should be of curiosity to analog and mixed-signal designers in addition to CAD device developers.
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Extra resources for A Top-Down, Constraint-Driven Design Methodology for Analog Integrated Circuits
The advantage of this strategy is that the model parameters are only extracted once, but used many times to calculate system performance. The followingdefi nitions illustrate how system performance parameters can be computed from the proposed D/A model parameters. 1 The ideal output vector, L, of a D/A converter is an n-dimensional vector, where the i t h component of L, L( i), represents the desired output for input code i, n = 2N , and N is the number of bits. 2 The output vectot; t, of a D/A converter is an n-dimensional vector, where the i t h component Oft, t(i), is the outputfor input code i.
If the physical assembly is successful, then the final verification step/summary generation step is required. This step includes the extraction of the circuitand simulation with the same simulator used in architectural selection. The "extraction" process spans the entire range from a simple net-listextraction to a complete extraction with parasitics. Finally, a summary of the expected performance specifications is generated. If all of the specifications are met, the flow control is returned to the upper node with the generated specifications.
However, we do not believe that automatic generation of macromodels for nonlinear circuitsin general is feasible. Macromodels composed of interconnections of basic circuit primitives available in circuit simulators are convenient in the sense that a circuit simulator such as SPICE can be used withoutany changes. 2 Analog "Multi-Level" Simulation The flexibility of the macromodeling approach can be increased by adding some additional features in the simulator. For instance, in iMACSIM , circuit blocks described bys-domain or z-domain transfer functions andmacromodels written in "C" are allowed.