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B43082A1226M_Datasheet PDF

来源:LM317 Electronics Components编辑:Pontiac Coil, Inc.时间:2021-06-15 14:50:30

The 2004 first quarter net income was $9 million or 2 cents per diluted share compared to a GAAP net loss of $122 million or 33 cents per diluted share in the 2003 first quarter.

Performance Technologies, www.pt.com

The race is on to build compact solid-state emitters and detectors for the underutilized spectrum between the microwave and the infrared regions. As in other domains of semiconductor activity, the contest is coming down to a competition among silicon, silicon germanium and compound-semiconductor systems.

B43082A1226M_Datasheet PDF

The focus, with early applications envisioned for medical, pharmaceutical and security equipment, is on devices that address the elusive terahertz gap”-roughly between 100 GHz and 30 THz (which respectively correspond to wavelengths of 3,000 microns and 10 microns). Scientists working with Michael Pepper at Toshiba's Cambridge Research Laboratory in Cambridge, England, were among those who in recent years have pursued methods for creating efficient emitters and detectors that could step into the breach. In 2001, TeraView Ltd. was spun off from the Toshiba lab to advance the work in the commercial realm.

Back in the mid-1990s there was a realization that a lot of the growth techniques used for quantum wells, molecular-beam epitaxy and so on could be very good for terahertz work,” said Don Arnone, the chief executive officer of TeraView.

It had been found that conventional microwave sources could not extend to high enough frequencies to produce radiation efficiently in the gap. At the same time, the compound-semiconductor laser diode sources familiar at optical and infrared frequencies were found to be limited in the gap region by thermal effects; in essence, thermal excitation becomes so large as to swamp population inversion and thereby prevent lasing.

B43082A1226M_Datasheet PDF

But recent advances in femtosecond pulsed-laser technology led to TeraView's terahertz pulsed injection system. TPI uses a femtosecond pulsed optical laser to excite electrons into the conduction band in the AlGaAs/GaAs compound-semiconductor structure. These electrons are then accelerated under a voltage, and that acceleration, together with a quantum-well-like structure, causes the electron/hole pairs to recombine and radiate in the terahertz band.

Commercial systemsAn optical-electrical-optical emission system is bulky, but the approach has yielded the world's first commercial terahertz spectrometers and scanning systems. Toshiba, which was supporting the research, gave us a strong drive toward commercial applications,” Arnone said.

B43082A1226M_Datasheet PDF

A similar structure can be used as a detector, with terahertz light modulating the flow of electrons in a device, he said.

TeraView launched its first commercial product, the TPI Spectra 1000 spectrometer, last August. Resembling a floor-standing photocopier, the system can exploit spectroscopic information within each TPI waveform to determine the chemical composition as well as the structural features of a sample.

Philips Semiconductors, for one, has revised its position on Zigbee, according to an executive who spoke with EE Times. Though an early and aggressive promoter of the spec, Philips is not ready to make a statement” about when it will enter the Zigbee chip market, Paul Marino, vice president and general manager of business line connectivity, said in an interview.

Indeed, the perception that Philips had three years ago of Zigbee's target market is no longer valid,” Marino said.

That admission, coming just two weeks before Zigbee Alliance members are scheduled to meet in Seattle, raises questions about Zigbee's momentum as the world embraces wireless networking on many levels. Philips remains a member of the Zigbee Alliance, but Philips Lighting replaced Philips Semiconductors on the board about a month ago.

Spec particulars

Zigbee captured imaginations by building security and application layer interfaces over 802.15.4. Operating in unlicensed bands worldwide at 2.4 GHz (global), 915 MHz (Americas) and 868 MHz (Europe), Zigbee offers raw data throughput rates of 250 kbits/second at 2.4 GHz, 40 kbits/s at 915 MHz and 20 kits/s at 868 MHz, with a transmission range of 10 to 100 meters. It touts long battery life, measured in months or years; a $3 bill of materials; and extraordinary scalability, to 64,000 nodes per master. Zigbee accommodates mesh and star cluster network topologies or a hybrid of the two.

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