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 technique in line with a top-down, constraint-driven layout paradigm that gives an answer to this challenge. this system has crucial merits: (1) it offers 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 college of California at Berkeley within the electric Engineering and laptop Sciences division. Many college and scholars, earlier and current, are engaged on this layout technique and its aiding instruments. The imperative objectives are: (1) constructing the layout method, (2) constructing and making use of new instruments, and (3) `proving' the technique by way of venture `industrial power' layout examples. The paintings awarded this is neither a starting nor an result in the improvement of an entire top-down, constraint-driven layout method, yet fairly a step in its improvement.
This paintings is split into 3 elements. bankruptcy 2 offers the layout technique in addition to beginning fabric. Chapters 3-8 describe aiding ideas for the technique, from behavioral simulation and modeling to circuit module turbines. eventually, Chapters September 11 illustrate the method intimately through offering 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 study issues.
A Top-Down, Constraint-Driven layout method for Analog IntegratedCircuits could be of curiosity to analog and mixed-signal designers in addition to CAD software developers.
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Verbal factors are preferred over mathematical formulation, graphs are stored to a minimal, and line drawings are utilized in this uncomplicated booklet. transparent tips and suggestion are supplied for these execs who lay out analog circuits.
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Additional resources for A Top-Down, Constraint-Driven Design Methodology for Analog Integrated Circuits
G, thermal noise, flicker noise, shci noise, and noise coupled from digital circuitry. Noise can cause the same chip to behave differently even if the same inputs are applied. Process variations causedifferent chips of the same circuit to have different behavior. To characterize these unintended, second-order effects, traditional user specifications include static specifications suchas integral nonlinearity (INL), differential nonlinearity (DNL), gain error, offset error, and probability of error due to noise, and dynamic specifications such as signal-to-noise ratio as a function of input frequency or input amplitude.
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  . The DNL, however, is much worse. 9) A reduction in layout area is traded forincreased DNL. Often this DNL penalty is too large. A compromise is to combine these two architectures. 12. The first nl most significant bits (MSB) are decoded in a linear first stage.
If the returned specifications fail to meet the criteria set by the mapping function , then the flow control is returned to the mapping function. On a successful return from all of the components, the component specifications are compiled to form a list of specifications corresponding to the original list. If this compiled list fails to meet the expected specifications, then a new mapping is attempted. If it is successful, there are two options, either proceed with the layout or stop here returning only the schematics.