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来源:LM317 Electronics Components编辑:O.C. White Co.时间:2021-06-14 04:02:20

This article was originally published in EE Times Confidential.

Although 2015 seems like a long way off, time is actually short, he said. The ITU group must submit its proposal in late 2014, and that means its decision on what spectrum to request must be made as early as mid-2013, he added.

Some of the studies supporting those decisions are already in progress, including one on use of frequencies below 790 MHz due by the end of this year, he said.

RN65C3091FRE6_Vishay Dale

In the meantime, operators are using an increasing diversity of bands to deliver services. Another NGMN working group is preparing on a document recommending use of more than 10 frequency bands for LTE and HSPA+ services by 2015, said Javan Erfanian, a Bell Mobility technologist chairing that group.

Alex Jinsung Choi, head of technology strategy at SK Telecom, gave an example of the pace of mobile data growth. The Korean operator has 3.1 million LTE subscribers now and expects that to double by the end of the year and continue ramping rapidly through at least 2017.

SK’s average LTE user consumes 1.4 Gbytes of data a month, a figure that is also rising. So we have to prepare for capacity increases,” he said.

RN65C3091FRE6_Vishay Dale

Like many other carriers here, that means bringing up services on multiple existing and new bands that range from 700 MHz to 2.6 GHz.

Seizo Onoe, vice president of R&D at Japan’s NTT Docomo, said the good news is carriers have been getting more spectrum from regulators. In addition, they can run 4G services in existing 3G bands, saving cost by reusing towers and RF chip sets in existing handsets. We don’t need to cry over LTE spectrum fragmentation,” he said.

RN65C3091FRE6_Vishay Dale

Nevertheless, he called for RFIC vendors to add more ports to their products and asked power amplifier makers to support a wider set of frequencies.

Equipment vendors are trying to respond to the spectrum crisis in the short term by ramping up support for all the potential LTE frequency bands. But the work poses challenges, especially in antenna design both in handsets and towers, said speakers here.

Visit Pulse Electronics at www.pulse-electronics.co.uk

Courtesy of EETimes Europe

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SAN FRANCISCO—EDA vendor Mentor Graphics Corp. said Wednesday (May 30) that foundry giant  Taiwan Semiconductor Manufacturing Co. Ltd. (TSMC) would use Mentor's Calibre SmartFill dummy fill solution in its 20-nm manufacturing process.

According to Mentor (Wilsonville, Ore.), SmartFill analysts and automatic filling capabilities in its Calibre YieldEnhancer product address new 20-nm fill requirements that cannot be achieved with traditional dummy fill approaches. Calibre SmartFill delivers smaller post-fill GDS database size and faster runtimes, allowing designers to meet IC fill constraints in a single pass without manual customization or modification, and with minimal impact on circuit performance, according to Mentor.

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