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 provides a brand new method in line with a top-down, constraint-driven layout paradigm that offers an answer to this challenge. this technique has central benefits: (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 study 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 technique and its assisting instruments. The vital objectives are: (1) constructing the layout method, (2) constructing and utilizing new instruments, and (3) `proving' the method via project `industrial energy' layout examples. The paintings offered here's neither a starting nor an result in the advance of an entire top-down, constraint-driven layout technique, yet particularly 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 options for the technique, from behavioral simulation and modeling to circuit module turbines. eventually, Chapters 11th of September illustrate the technique intimately by means of featuring 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 driving force approach. bankruptcy 12 offers conclusions and present learn subject matters.
A Top-Down, Constraint-Driven layout method 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
A three-bit (n = 3) converter is shown in the figure. ' In the graph, the x-axis contains the 8 (2 n ) possible input codes while the y-axis shows the corresponding current output. 4. One least significant bit (LSB ) is the ideal difference in current between any two adjacent inputcodes. Thefull scale range is the idealdifference between highestcode (2n - 1) and the lowest code (0). In the figure, 1 LSB equals I unit of current, and the full scale range is 3 units of current. The unit amount is usuallyset by a reference.
Still, these existing techniques need to be refined and new analysis, modeling and simulation techniques need to be developed to address other special problems that arise in analog design. For instance, one critical non-ideality in analog circuits is electrical noise. It is caused by the small current and voltage fluctuations that are generated within the integrated-circuit devices themselves. Accurate prediction of the noise performance of the analog blocks in a mixed-signal system design is crucial to ensure that the overall system will work correctly.
Non-working"parts areprimarily due to these second-order effects. 7 bythesolidline. Thedotted linerepresents theideal behavior. Problematic points are indicated on the curve. Point A shows that there is no "off" state. Point B illustrates an extreme deviation from the ideal. In a signal processing system, this could result in large unwanted harmonics. PointC shows anarea of non-monotonicity. In a feedback system, thiscould resultin a disastrous reversal of the feedback polarity. PointD shows an extremely highoutput.
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