An Odometer for Silicon Chips

Future chips will show signs of age much faster than previous generations. Now there's a circuit that keeps tabs on their wear and tear

3 min read

15 June 2009—You can tell a car’s age and how long you expect it to last just by looking at the mileage on its odometer. University of Minnesota electrical engineering professor Chris H. Kim wants to do essentially the same for silicon chips. This week at the VLSI Symposia, in Kyoto, Japan, he reported the development of a silicon circuit that tracks the three signs of aging that can slow down a chip’s performance. The hope is that integrating such a circuit into a microprocessor could help the microprocessor compensate for its own aging.

”The notion that a transistor ages is a new concept for circuit designers,” says Kim. Transistor aging has traditionally been the bailiwick of engineers who design the processes that make transistors; they also formulate recipes that guarantee the transistors will operate within a certain frequency and other parameters typically for 10 years or so.

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3 Ways 3D Chip Tech Is Upending Computing

AMD, Graphcore, and Intel show why the industry’s leading edge is going vertical

8 min read
Vertical
A stack of 3 images.  One of a chip, another is a group of chips and a single grey chip.
Intel; Graphcore; AMD
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A crop of high-performance processors is showing that the new direction for continuing Moore’s Law is all about up. Each generation of processor needs to perform better than the last, and, at its most basic, that means integrating more logic onto the silicon. But there are two problems: One is that our ability to shrink transistors and the logic and memory blocks they make up is slowing down. The other is that chips have reached their size limits. Photolithography tools can pattern only an area of about 850 square millimeters, which is about the size of a top-of-the-line Nvidia GPU.

For a few years now, developers of systems-on-chips have begun to break up their ever-larger designs into smaller chiplets and link them together inside the same package to effectively increase the silicon area, among other advantages. In CPUs, these links have mostly been so-called 2.5D, where the chiplets are set beside each other and connected using short, dense interconnects. Momentum for this type of integration will likely only grow now that most of the major manufacturers have agreed on a 2.5D chiplet-to-chiplet communications standard.

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