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 while designing combined analog-digital platforms. A Top-Down, Constraint-Driven DesignMethodology for Analog built-in Circuits offers a brand new method in accordance with a top-down, constraint-driven layout paradigm that gives an answer to this challenge. this system has important merits: (1) it presents a excessive likelihood for the 1st silicon which meets all requisites, and (2) it shortens the layout cycle.
A Top-Down, Constraint-Driven layout method 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, earlier and current, are engaged on this layout method and its assisting instruments. The relevant objectives are: (1) constructing the layout technique, (2) constructing and making use of new instruments, and (3) `proving' the method via project `industrial power' layout examples. The paintings offered this is neither a starting nor an lead to the advance of an entire top-down, constraint-driven layout technique, yet really a step in its improvement.
This paintings is split into 3 components. bankruptcy 2 provides the layout technique in addition to origin fabric. Chapters 3-8 describe aiding thoughts for the method, from behavioral simulation and modeling to circuit module turbines. ultimately, Chapters Sept. 11 illustrate the method intimately through providing the whole 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 procedure. bankruptcy 12 offers conclusions and present study issues.
A Top-Down, Constraint-Driven layout method for Analog IntegratedCircuits may be of curiosity to analog and mixed-signal designers in addition to CAD device developers.
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Additional info for A Top-Down, Constraint-Driven Design Methodology for Analog Integrated Circuits
13 on the left, is that if there is a large difference between the reference unit element and the other unit elements, then this results in large DNL errors when thesecond stage switches from allbitson to off. Thesecond approach, an interpolative architecture, solves this problem. The reference element for the second stage is always the next unit element to be turned on in the first stage. In this way, thesecond stage transition point erroris eliminated. Thecost of thelatter approach is more switches which results in larger layouts.
Use of numerical math software, such as MATLAB from MathWorks, for various high-level simulation tasks is also common. SIMULINK (comes with MATLAB) is an interactive system for simulation of general nonlinear dynamic systems, and provides a similar "high-level" simulation environment like the ones in analog "multi-level" simulators. User creates the model of a system building an interconnection of "blocks" from a library using a graphical language. Various types of linear, nonlinear, continuous-time, discrete-time modeling blocks, signal sources and post processing functions arc available.
Sincefewer switchcontrol signals are required, there is a tremendous reduction in routing complexity, and thistranslates into a hugesavings in layout area. There arenosavings in active transistor area sincean nx sized transistor is implemented by n Ix transistors in parallel. Another advantage is that a thermometer decoder is not required. The input bits directly control the switches. For example, code all, activates the 1x and 2x current source to produce a 3x output. The INL for the binary and linear array architectures is the same  .
A Top-Down, Constraint-Driven Design Methodology for Analog Integrated Circuits by Henry Chang, Edoardo Charbon, Umakanta Choudhury, Alper Demir, Eric Felt, Edward Liu, Enrico Malavasi, Alberto Sangiovanni-Vincentelli, Iasson Vassiliou