March 7, 2017

ASIC Design in the Silicon Sandbox: A Complete Guide to by Keith Barr

By Keith Barr

Observe how one can layout, construct, and Optimize personalized Mixed-Signal built-in Circuits for a wide selection of makes use of either inspirational and functional, ASIC layout within the Silicon Sandbox bargains electronics engineers a hands-on consultant to mixed-signal circuits and layouts. The publication presents an in depth roadmap for designing and construction customized circuits which are optimized for goal units, supplying more desirable performance and decreased price in entire items. Written by way of circuit layout specialist Keith Elliott Barr, this entire source covers every little thing from layout and optimization easy methods to regular mobilephone layouts to packaging and trying out. Readers will locate easy-to-apply details on peripheral circuits; area of expertise common sense constructions and reminiscence; good judgment, binary arithmetic, and processing; converters and switched-capacitor concepts; and lots more and plenty extra. choked with thousands of beneficial illustrations, ASIC layout within the Silicon Sandbox positive aspects: A wealth of full-color commonplace mobilephone layouts a number of ways to amplifier, oscillator, bandgap, and different analog features Down-to-earth details on built-in circuit fabrication charges Real-world suggestion on designing and optimizing customized built-in circuits useful examples of ways to imagine via new layout suggestions step by step tips on coming into the fabless semiconductor undefined inside of This state of the art IC layout Reference • The Sandbox • Fabs and techniques • Economics • layout instruments • commonplace mobile layout • Peripheral Circuits • forte good judgment constructions and reminiscence • common sense, Binary arithmetic, and Processing • Analog Circuits: Amplifiers • The Bandgap Reference • Oscillators, section Locked Loops, and RF • Converts and Switched-Capacitor strategies • Packaging and checking out • Odds and Ends

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Com). Copyright ©2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website. ECONOMICS Keith Barr 52 When planning an IC that is intended to replace a product’s existing circuitry, you may be tempted to simply “copy” the functions from a PCB directly onto the ASIC. My advice is to not even consider such a thing. Look at the overall product’s function, imagine what additional features may be easy to provide and valuable to include, and which features can be removed; learn about all the toys we have available in the sandbox and design a part from scratch that really gets the job done cost-effectively.

Any use is subject to the Terms of Use as given at the website. FABS AND PROCESSES Keith Barr 35 these processes don’t change much when going from one process to another. 35 μ typically employ three metal layers with the option of a fourth. 35 μ. The number of devices that can be fit in a given space roughly increases as the square of the geometry size reduction, while speed is improved and dynamic power consumption is lowered. The initial cost of masks, however, makes the use of fine-line processes prohibitive for low production projects.

Fabs have programs that will analyze your design and add metal wherever the program thinks there isn’t enough. Since you probably don’t want a spare chunk of metal that nicely couples the input to the output of that wideband amplifier you worked on so hard, you’re pretty much forced to deal with it as you design; put in the metal and ground it. Another rule that can cause no end of frustration is the antenna rule. The problem is that the thin oxides under the gates in transistors are electrically fragile, and the plasma etching processes used for the etching of all layers can cause electrical charges to develop during the etching process, threatening the breakdown of TOX.

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