New laptop GPUs from AMD. Free Technical Library News

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New AMD Notebook GPUs

05.05.2012

AMD has released three next-generation mobile GPUs, the HD 7900M, HD 7800M, and HD 7700M, as part of the Radeon HD 7000M series, SlashGear reports.

All three processors feature the new Enduro technology, which automatically switches the system from integrated graphics to discrete graphics and vice versa, depending on the current tasks, thereby extending battery life (similar to Nvidia's Optimus).

Complements Enduro with two more power-saving technologies: the first dynamically turns off parts of the processor when they are not needed, the second - called ZeroCore - plunges the processor into an idle state in which it consumes almost no electricity.

The processors are based on 28nm technology (as opposed to 40nm in the HD7000 line) and fully support DirectX 11.

The manufacturer calls the HD7900 "the most technically advanced and most feature-packed mobile solution AMD has ever released." Designed for gaming laptops, it runs at 850 MHz and is equipped with 2 GB of GDDR5 video memory with a 256-bit interface.

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Miniature infrared spectrometer 19.10.2019

Researchers at the Swiss Federal Institute of Technology (ETH) have created a tiny infrared spectrometer that is small enough to fit on a semiconductor chip and yet "provides a lot of interesting possibilities." According to the researchers, chips with such spectrometers can be used in a variety of areas, from the space industry to everyday items. One example of this is the integration into the design of mobile phones.

With the help of an infrared spectrometer in a smartphone and a special application, this device becomes able to determine the alcohol content in a liquid, conduct a simple chemical analysis of a substance, determine the degree of maturity of fruits and vegetables, and perform a number of other functions that will be useful to people of various professions.

The main achievement in all this is the extremely small size of the spectrometer. Conventional infrared spectrometers currently used for analysis are expensive and bulky devices weighing at least a few kilograms and extremely difficult to convert into portable devices.

A conventional spectrometer splits light into two streams, which are reflected from mirrors, added again in a certain way, and the result is measured by a sensitive photosensor. By changing the position of one of the mirrors, it is possible to change the optical image resulting from the addition of two beams of light, which makes it possible to determine the proportion of the content of light with different wavelengths in the incoming optical signal.

The miniature spectrometer uses exactly the same principle. Only instead of movable mirrors, it uses special waveguides, the light refractive index of which can be changed using an external electric field. Changing the refractive index in this case has the same effect, similar to the effect of changing the position of the mirror.

In addition, by changing the refractive indices of two waveguides at once, using a miniature spectrometer, you can work with different parts of the infrared range. Another undoubted advantage of this device is that it needs a one-time calibration, which can be carried out at the manufacturer immediately after the chip is manufactured or the chip is integrated into the final device. In contrast, conventional spectrometers require calibration before each run.

The design of the new miniature infrared spectrometer has no moving parts, making it extremely reliable. But, as the researchers themselves admit, before their offspring can be used in mobile devices, they will need to carry out a number of works aimed at improving technologies and bringing these technologies into line with the requirements of modern industrial production.

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