Download for free the book Mobile communications. DECT technology. Dinges S.I., 2003

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Mobile connection. DECT technology. Dinges S.I., 2003.

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The basic principles of construction and operation of communication systems with mobile objects are considered. Characteristics of the DECT standard, access and interaction profiles are outlined. Various aspects of functioning of DECT systems are considered. An analytical review of options for the architectural and circuitry implementation of RF units and individual units of transceivers of such systems is given. A list of English abbreviations and an explanatory dictionary of terms used in modern communication systems is presented. For a wide range of readers. It may be useful to specialists involved in the design and operation of communication systems and devices, students of higher and secondary specialized institutions specializing in the field of communications.

All electronic communication books online, which can be downloaded for free and without registration: Antenna Books, Books on amateur radio equipment, Books on communication lines, data transmission, Mobile Phone Books, Books on the theory and practice of radio communications

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Chip cooling with a plasma fan 11.06.2004

American engineers have come up with a new concept for cooling microcircuits - using a cold plasma fan.

To activate the plasma fan, invented by scientists from Purdue University, USA, the air is ionized and the resulting plasma cloud is driven over the microcircuit by an alternating electric field. Air molecules collide with it in the same way as with the feathers of an ordinary fan, and change, that is, cold particles come to the place of hot ones near the surface of the microcircuit and it cools down.

"Air exchange at the surface of the chip is a headache for electronics engineers," says Suresh Garimella, director of the university's Center for Research on Cooling Technology. "That's why there is always a fan in the computer. Not only is it noisy, it also consumes energy. In addition, you need a heat sink - a heatsink attached, for example, to the processor. Our device is completely silent; it simultaneously cools the microcircuit and performs air exchange. " Ions for the plasma fan will be obtained by stripping electrons from the cathode of nanotubes.

It is no coincidence that this material is considered the most promising for cold cathodes in cathode ray tubes: pointed nanoapexes easily part with the charge. An alternative material is polycrystalline diamond films: the boundaries between their grains also emit electrons well. As a result, a potential difference of one hundred volts instead of the usual kilovolts is enough to ionize the air. "Such devices are easy to manufacture by conventional microelectronics methods directly on a microcircuit.

It will be just another layer of it," says Suresh Garimella. Now the researchers are busy patenting, as well as figuring out exactly how much heat can be removed by a plasma fan.

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