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来源:LM317 Electronics Components编辑:Avery Dennison时间:2021-06-14 03:47:38

Bärvågsmodulering Innan signalen förs in i den optiska fibern, skall den moduleras. Ett sätt är att modulera laserns förström direkt, men det är mycket svårt att switcha en laser med hög bandbredd för höghastighetskommunikation. En vanligare metod är att låta lasern vara frisvängande och använda en yttre elektrooptisk komponent för att modulera ljuset.En sådan elektrooptisk komponent är Mach-Zender-modulatorn (MZ). Denna innehåller två 3 dB kopplare. Signalvägarna mellan dem har olika tids- och fasförskjutningar. Det kan åstadkommas genom olika långa signalvägar eller genom skilda refraktionsindex. Genom att lägga ett elektriskt fält över en av dem, eller över båda signalvägarna, kan refraktionsindex ändras så mycket att den relativa utbredningstiden ändras. Det har samma effekt som om längden varierades. Men nu kan vi ändra detta direkt med en elektrisk signal.

Revolutionary concepts will also be explored, with MRAM, FeRAM, and PRAM being most likely to succeed in certain applications where the SoC can be segmented more optimally taking advantage of the increased feature set.

giant transistor

According to the Bureau of Labor Statistics, 26,000 EEs were unemployed in the fourth quarter of 2002, as were 94,000 computer scientists. The IEEE is pushing our pals in Washington to lower the H-1B visa quota, since the large pool of guest workers makes it difficult for U.S. workers to find a job. Sounds fair.

The same issue of the Grid had a write-up on the 13 Bay Area engineers who had been elected fellows of the IEEE. That's quite an honor. Over half of the honorees were born outside the United States, and hold degrees from such institutions as the Swiss Federal Institute of Technology; National Taiwan University; BITS Pilani, India; University of Technology at Llmenau, Germany; India Institute of Technology in Madras; Technical University of Northrhine-Westfalia, Aachen, Germany; and Birla Institute of Technology in Mesra, India.

The contributions these engineers, scientists and educators have made to the engineering profession and to the University of California at Berkeley, Stanford University, Intel, Texas Instruments, Nortel, TSMC, Synopsys, Cadence, IBM and other high-tech companies along the way is well-documented. And we are all better off that they chose to come to this land of opportunity. Muchas gracias, amigos.

giant transistor

When Frank isn't cheering both the native and foreign-born engineers and scientists, he can be reached at fburge@cmp.com.

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giant transistor

Norwood, Mass. – Two digital temperature sensors from Analog Devices Inc., the TMP05 and TMP06, offer single-wire, pulse-width-modulation outputs with accuracy to plus/minus 1 degrees C maximum from 0 degrees C to 70 degrees C. Designed for battery-powered and portable consumer, industrial and medical applications, both have an operating range from -55 degrees C to 150 degrees C and a supply voltage of 2.7 to 5.5 V. They come in five-lead SC-70 and SOT-23 packages.

Both devices offer three modes of operation: daisychain, in which any number of TMP05/06 sensors can be connected to the same microcontroller; continuously converting; and one-shot mode, which reduces power consumption to 8.25 microwatts.

Note that the phase noise requirement is pretty relaxed compared with that of DCS1800. Similar to WCDMA and DCS1800, the DECT standard outlines a set of conditions to test the intermodulation performance of the receiver. A desired signal is at -80dBm. Two adjacent channel signals are applied with a -46dBm input power. Using the same procedure to calculate the IIP3, we have an IIP3 for DECT of:

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