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Mathematical Clock

Posted by T P Kausalya Nandan
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3D Transistors: Better Performance at Even Lower Power

Posted by K.Rambabu
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Technology has progressed quite swiftly, since one of the greatest inventions-transistor, paving way for more powerful, cost-effective and energy efficient products. For the first time in history, silicon transistors have entered the third dimension with the Tri-Gate transistors. Read on to find out it's features, structure and how it benefits the new-age processors.

So what comes to your mind when you hear the word 'Intel'? Definitely, a manufacturer of all your celeron's, pentium's, dual cores, core i's, and other micro-processor chips, right? The pace dictated by Moore's Law has required numerous innovations and as a result of which the 'Sponsors of Tomorrow' introduced a three dimensional transistor technology, which is basically, Tri-Gate transistors on its 22 nm logic technology.

Important Turning Point in Transistor Technology

In 1947, the first transistor was demonstrated at Bell Laboratories. Silicon was first used to produce bipolar transistors in 1954, but it was not until 1960 that the first silicon metal oxide semiconductor field-effect transistor (MOSFET) was built. The earliest MOSFETs were 2D planar devices with current flowing along the surface of the silicon under the gate. The basic structure of MOSFET devices has remained substantially unchanged for over 50 years.

Continued optimization and manufacturability studies on 3-D transistor structures was on at research and development organizations in leading semiconductor companies. Some of the process and patent development has been published and publicly shared, and some remained in corporate labs. The International Technology Roadmap for Semiconductors (ITRS) drives the research investment interests of the semiconductor industry, which is coordinated and published by a consortium of manufacturers, suppliers, and research institutes.

The ITRS defines transistor technology requirements to achieve continued improvement in performance, power, and density along with options which should be explored to achieve the goals. The ITRS and its public documentation captures conclusions and recommendations regarding manufacturing capabilities like strained silicon and High-K metal gate, and now the use of 3-D transistor technologies to maintain the benefits of Moore’s law. Based on documents produced by the ITRS and an examination of academic papers and patent filings, research into 3-D transistor technologies has grown dramatically in the last decade.

The Triggers That Threw Spotlight on 3-D Transistors

Two important pronouncements that have occurred in the last two years that have propelled the 3-D transistor structure into the industry spotlight, and into a permanent place in the technology story of MOSFET transistors are 1) The first announcement by Intel Corporation on 4th of May, 2011, about their Tri-Gate transistor design that had been selected for the design and manufacture of their 22 nm semiconductor products. 2) The second announcement was the publication of ITRS technology roadmaps, with contributions from many other semiconductor manufacturing companies that identified 3-D transistor technology as the primary enabler of all incremental semiconductor improvement beyond the 20 nm or 22 nm design node.

So Exactly How Small is 20 nano-meter?
Each and every micro-processor manufactured today is made of millions, or even billions, of tiny electrical components called transistors. Over time, in accordance with Moore's law, transistors have been getting smaller and smaller and because of which, computing and communication devices continue to get smarter, faster and highly efficient.

Intel believes that keeping up with Moore's Law has never been exactly easy. Especially for 22 nanometers, Intel claims that it became clear early on that continued shrinking was not going to give the expected benefits without some radical redesign. After a decade of research and development, taking advantage of the work of Hisamoto and others in FinFET development and optimization, Intel invented the solution. For the first time in history, the transistor has officially entered the 3rd dimension. Image 1 shows what a 3D transistor looks like.

Image 1: A 3D transistor chip
In fact, there are more than a billion transistors on this single chip which, unfortunately, are far too small to be seen with the naked eye. Now imagine yourself 20,000 times smaller! To give you a point of reference, right now, you are even smaller than a human hair. But you would actually still be far too large when compared to a 22 nano-meter transistor for a meaningful imagination. You actually need to be 100 nano-meters tall or about 20 million times smaller than your actual size. At this scale, you are about the right size to literally see, demonstrate some of the attributes and functions of a single, modern transistor out of those millions of transistors inside the 3D transistor chip. Well, since there's no such shrinking device as yet, let us just consider the figures below as transistors models and understand.

But first, what are 2-D transistors?

Image 2: Traditional Planar 2-D Transistor
For the last four decades, planar or 2-D transistors, have been at the core of transistor design and architecture. In the image-2, we see a form of silicon that creates a stream (dotted yellow) through which electrons flow. The gate, which is made of metal over a material with high dielectric constant, controls the flow of electricity in that stream. It acts as an ordinary switch, turning flow on and off. That is, if an ordinary switch had the ability to turn itself on and off over 100 billion times a second! Technically, traditional 2-D planar transistors form a conducting channel in the silicon region under the gate electrode when in the “on” state. Talking about states, some key objectives in transistor design are to have as much current flowing as possible when in the “on state” for performance, to have as close to zero current flowing when it is in the “off” state to minimize power usage, and to switch very quickly between the two states again, for performance.

Now Coming to 3-D Transistors...

Image 3: 22nm Trigate Transistor
As transistors get ever smaller, one way to achieve this is to get tighter control, by having the gate wrap around the channel as much as possible. The animated version of the transistor can be seen in image-3. With Intel's 3D transistor's architecture, the flat two dimensional stream has been replaced with one or more three-dimensional fins as shown in the image-4.

Image 4: 22nm Trigate Transistor
The control is on all the three sides of each fin, rather than just one, as in the the Planar 2-D transistor. In simpler terms, the transistor channel is raised into the 3rd dimension. Current flow is controlled on three sides of the channel (top,left and right). This is called a Tri-Gate transistor and its real advantage over Planar is the ability to operate at lower voltage with lower leakage, providing an unprecedented combination of improved performance and energy efficiency. This breakthrough invention allows Intel to create transistors that are smaller, faster and use less power than ever before, enabling a new generation of computing technology in every category, from the fastest super computers to the smallest hand-held devices. Tri-Gate transistors can have multiple fins (as shown in image 5) connected together to increase total drive strength for higher performance.

Image 5: Tri-Gate transistors with multiple fins
The Real Deal With 3D
The 3-D geometry and structure of the Tri-Gate transistor provides a host of important improvements over the planar transistor structure, all related to the ‘wrap-around’ effect of the MOSFET ‘gate’ around the source-to-drain ‘channel.’ These advantages manifest in improved performance, reduced active and leakage power, transistor design density, and a reduction in transistor susceptibility to charged particle single event upsets (SEU).

The power advantage results from the improved control of the channel by the gate’s electric field on three sides of the fin. As explained by Intel Corporation at their Intel Developer Forums (2011, 2012), this power advantage is created by an effectively steeper transistor voltage curve for Tri-Gate transistors. Transistor designers can take advantage of this steeper curve with either a significant reduction in leakage current for the same performance of a planar transistor, or substantially higher performance (transistor operation speed), or a combination of both.

The Real Advantage of Tri-Gate Transistors
·More than 50% power reduction at constant performance.
·37% performance increase at low voltage.
·Improved performance and efficiency.

"For years we have seen limits to how small transistors can get," said Gordon E. Moore. "This change in the basic structure is a truly revolutionary approach, and one that should allow Moore's Law, and the historic pace of innovation, to continue." - Gordon E. Moore

"The performance gains and power savings of Intel's unique 3-D Tri-Gate transistors are like nothing we've seen before. This milestone is going further than simply keeping up with Moore's Law. The low-voltage and low-power benefits far exceed what we typically see from one process generation to the next. It will give product designers the flexibility to make current devices smarter and wholly new ones possible. We believe this breakthrough will extend Intel's lead even further over the rest of the semiconductor industry." - Mark Bohr, Intel Senior Fellow

The original transistor built by Bell Labs in 1947 was large enough that it was pieced together by hand. By contrast, more than 100 million 22nm tri-gate transistors could fit onto the head of a pin*.

More than 6 million 22nm tri-gate transistors could fit in the period# at the end of this sentence.

A 22nm tri-gate transistor's gates that are so small, you could fit more than 4000 of them across the width of a human hair^.

If a typical house shrunk as transistors have, you would not be able to see a house without a microscope. To see a 22nm feature with the naked eye, you would have to enlarge a chip to be larger than a house. (4)

Compared to Intel's first microprocessor, the 4004, introduced in 1971, a 22nm CPU runs over 4000 times as fast and each transistor uses about 5000 times less energy. The price per transistor has dropped by a factor of about 50,000.

A 22nm transistor can switch on and off well over 100 billion times in one second. It would take you around 2000 years to flick a light switch on and off that many times**.

It's one thing to design a tri-gate transistor but quite another to get it into high volume manufacturing. Intel's factories produce over 5 billion transistors every second. That's 150,000,000,000,000,000 transistors per year, the equivalent of over 20 million transistors for every man, woman and child on earth.

*A pin head is about 1.5 mm in diameter.
#A period is estimated to be 1/10 square millimeter in area.
^A human hair is about 90 microns in diameter.
(4)The smallest feature visible to the naked eye is 40 microns.
**Assumes a person can flick a light switch on and off 150 times per minute.

Table Courtesy – Intel's Press Material on 22 nm 3-D transistor technology

Tri-Gate Devices Now in Production

Image 6: 22nm Manufacturing Fabs
The advanced state of semiconductor manufacturing at very small geometries (40 nm, 28 nm, 22 nm or 20 nm and beyond) requires research and development expenditures that now limit this technology to a handful of companies with capital expenditure capabilities in the billions of dollars. As a result, only a handful of manufacturers are able to capitalize on the known advantages of 3-D transistor technology. Intel Corporation is the only company to have made this design and manufacturing transition in 22 nm technology, and can provide data on the overall maturity and manufacturability of Tri-Gate transistors on a mass production scale. This data, as of the first quarter of 2013, includes 100 million units of Tri-Gate transistorbased products.

Image 7: Gates and Fins of 22 nm 3-D transistor
Several known issues and characteristics of the 3-D gate structure have been acknowledged and addressed to achieve manufacturing and design maturity with the technology. These include the modeling of new parasitic capacitance values not modeled in traditional planar designs, layout dependent effects, and the use of double-patterning techniques using current lithographic equipment to form closely spaced fins. A great deal of publicity and user education is underway in 2013 by companies like Cadence and Synopsys revolving around the impact of Tri-Gate rules and flexibility in the design of future semiconductor products.

Impact on FPGA and Other Semiconductor Device Performance

Let's see how this three dimensional technology will provide a significant boost in the capabilities of high-performance programmable logic.

The primary advantage of Tri-Gate technology to FPGA-based electronic product designer is the continuation of Moore’s Law in the steady march of improvements in transistor density, performance, power, and cost-per-transistor. This sustains an industry of consumer electronics, computing platform development, software complexity advances, memory and storage growth, mobile device creativity and development, and business automation and productivity.In addition, control over the static and active power dissipation of semiconductors improves tremendously with this technology. For users of FPGAs, this makes programmable logic that advances to 14 nm technology and beyond both power competitive with ASIC and ASSP design solutions on available competing design nodes, with even more significant advantages in programmability, performance, flexibility, Open Computing Language (OpenCL™) software design entry, and integration of DSP, transceiver, hardened processor, and configurable I/Os.
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'Made For Mobile' Microprocessors

Posted by K.Rambabu
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on Wednesday, 18 September 2013
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There is a great degree of mobile-desktop convergence happening, as palpable from the current-generation tablets and smartphones. Yet, mobile devices have special requirements that require special processors

"Mobile processors are designed with the approach of doing more with less. This is one of the reasons why you do not see x86-based smartphones today,” quips James Bruce, lead mobile strategist at ARM. In the case of desktop processors, power ef-ficiency,size of the chip and thermal management are not limiting factors, though these are important design aspects. However, in the case of a mobile device, which needs to compete with a desktop in terms of functionality and at the same fitinto your pocket, working for long hours on battery, these ‘mobility’ factors are critical.

Bruce explains that desktop processors are ‘processors on chip.’ Many surrounding chips are needed to complete the compute sub-system. On the other hand, in the mobile world, the complete sub-system is on a single chip—a system-on-chip (SoC).

“For example, you may have a 3G (or even 4G) modem, processor, graphics, video unit, audio decoder, Wi-Fi, Bluetooth, geographical positioning system (GPS), dynamic random-access memory (DRAM) and Flash, all in one 14×14mm² package,” Bruce says.

Praful Joshi, business development manager, WindRiver India, concurs, “The key challenge to an engineer designing a mobile processor is how to add more functionality while design-ing an SoC without compromising on low power consumption or low form factor. In fact, the processor chip size is a very important factor. You can see new very-large-scale integration (VLSI) technologies such as 30 nm or less being widely used in mobile processors as against desktop processors.”

“Today, consumers expect to have the same kind of computing experience on their mobile device as on their desktop or notebook PC—high-definition(HD) video playback, audio and video streaming, multitasking, Web browsing, 3D gaming and 3D interfaces. However, the power envelopes of a PC and a mobile device are radically different. Simply miniaturising a traditional x86 CPU, which you would find in vast majority of PCs, is not enough. The resulting processor might physically fitinto a mobile device but its power consumption would result in a device with a battery life of minutes,” says Vishal Dhupar, managing director, Asia-South, NVIDIA.

Dhupar recalls that when creating NVIDIA’s mobile solution Tegra, their engineers had started from the ground up with a strict power budget. The designers had to fightfor every milliwatt of power. All of this shows that a mobile being different from a desktop, its processor also needs to be different.

War of the titans
Quite naturally, the repertoire of made-for-mobile microprocessors is also increasing, with many ARM-based offerings from Texas Instruments (TI), Qualcomm, NVIDIA, MediaTek, etc, and Intel Atom chips also catching up now.

“ARM is the most popular processor in the mobile device world. It is not a derivative of any desktop processor. It was designed specificallyfor low-power-consuming devices. Since then it has emerged as a mainstream mobile processor and added more computational capabilities and a software ecosystem. ARM licenses its core processors to SoC vendors such as TI, Qualcomm and others, who, in turn, add their own unique IP for different mobile markets,” says Joshi of WindRiver—an Open Source operating systems (Android, Linux and Tizen) commercialisation partner for mobile processor designers as well as mobile device manufacturers.

ARM has several processors for designers to choose from, including the latest Cortex-A9, which features  2GHz typical operation with the TSMC 40G hard macro implementation, low-power targeted single-core implementations into cost-sensitive devices, and an optional NEON media and floating-pointprocessing engine. It is also scalable up to four coherent cores with advanced MPCore technology.

ARM’s model of licensing its core processors to other vendors is a unique selling proposition. “Because desktop processors are really only available from two companies, there is limited innovation and diversity. Compare this to the ARM business model where any company can license an ARM processor and build its own unique intellectual property (IP) around its own unique configurationof ARM cores. This business model is very exciting as it provides opportunities for new companies in India to develop their own application processors for tablets or smartphones,” says Bruce.

Intel Atom processors are also emerging and gaining a market in mobile devices. These are derivatives of desktop processors like Pentium Core i5, i7, etc. The Intel Atom processor Z6xx combines 45nm Intel Atom processor core with 3D graphics, video encode and decode, as well as memory and display controllers into a single SoC design. Combined with the Intel SM35 Express chipset, it supports Windows, MeeGo and Android operating systems.

While the processor appears more popular in the netbook space, a variety of smartphones and mobile Internet devices (MIDs) for cloud computing are also sporting the ‘Intel Inside’ logo these days. Joshi suggests that although ARM is a leader in the mobile space, Atom can benefitfrom the Intel’s experience in the desktop space as the current trend portrays a deep convergence of desktop and mobile worlds.

Multi-core magic
As mobiles race to beat the capabilities of computers, it is inevitable that some of the trends in the PC processor space will also spill over to the mobile world. One such trend is the magic of multi-cores.

“Due to the growth in the availability of high-speed mobile and WiFi networks, mobile devices will also be used for various performance-intensive tasks that were previously handled by traditional PCs. Single-core mobile processors are not designed to deal with this tidal wave of high-performance use cases,” explains Dhupar.

“On a mobile processor that has a multi-core CPU, multi-tasking can be shared between the distinct processing cores. Hence, as the performance requirements of mobile applications increase, SoC vendors are adopting multi-core processor architectures to deliver the increased performance and keep power consumption within mobile budgets,” he adds.

It is a common misconception that more cores mean higher power consumption. In fact, multi-core CPUs are able to distribute their workload across their cores so that each CPU core can run at a lower frequency and voltage. This means each core consumes significantlylower power and offers much higher performance per watt than single-core CPUs.

The performance of a smart phone has increased 40 times over the last ten years; and the increase in performance since 2008 alone has been eight times. One reason for this is the adoption of multi-core technology. Last year saw the launch of dual-core Cortex-A9 smartphones. This year, we are likely to see the launch of quad-core Cortex-A9 smartphones.

Bruce predicts that at the end of 2012, we will see the launch of Cortex-A15 handsets with a 50 per cent increase in performance. “Also in 2012 you will see the launch of Cortex-A15 based handsets at a $100 price point. The Cortex-A15 processor allows $100 smartphones to deliver the user experience of a $500 smartphone in 2010,” he says.

NVIDIA is also focusing on multi-core architectures. Its latest Tegra 3 processor goes a step beyond quadcore by adding a fifth‘companion’ core. Its internal architecture is identical to the four main Cortex-A9 CPU cores but the fifthcore is built using a special low-power silicon process. Using a technology called variable symmetric multiprocessing, the fift core handles low-frequency tasks such as those common in active standby mode (Twitter and Facebook updates, e-mail synchronisation, etc) and applications that do not require significantCPU processing power, such as audio streaming, offline audio playback, an both online and offine video playback.

When more demanding tasks are required, the other four cores can be called upon. This approach allows Tegra 3 to deliver significantlylower power than competing mobile processors at all performance levels.

It is interesting to note that the popular low-cost, open mobile software development platform PandaBoard too is now available in a dual-core version, keeping pace with the current trend. In November 2011, the community announced the availability of the PandaBoard ES based on TI’s OMAP4460 processor, whose multi-core architecture includes two ARM Cortex-A9 cores running at up to 1.2 GHz each, delivering a 20 per cent increase in overall performance and a 25 per cent increase in graphics when compared to the OMAP4430 processor used by the earlier PandaBoard.

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How Small Transistors can be?

Posted by T P Kausalya Nandan
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on Thursday, 12 September 2013
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Mosquito Killer Bat Circuit

Posted by T P Kausalya Nandan
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on Thursday, 12 September 2013
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