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May 6, 2008 Clocking Family Trims Noise In Wireless Infrastructure A family of three ultra-low-noise clock buffers, dividers, and distributors vows to simplify system clock design while providing additive noise of just 30 fs of additive root-mean-square (RMS) jitter... — Paul Whytock May 6, 2008 2.4-GHz Transceiver Delivers Lean Power Solution A single-chip, 2.4-GHz transceiver is promising to deliver impressive radio performance. The nRF24L01+ from Nordic Semiconductor (www.nordicsemi.com) delivers a 250-kb/s data-rate option mode that triples operating range and drop-in compatibility with the company’s existing nRF24L01 2.4-GHz Ultra Low Power (ULP) transceiver... — Paul Whytock May 6, 2008 Renesas Teams Up With IMEC On Reconfigurable RF Transceivers Renesas Technology has entered into research collaboration with IMEC, Europe's independent nanoelectronics research centre. The joint venture will concentrate on developing 45nm RF transceivers targeted at Gbit/s cognitive radios... — Paul Whytock April 2008 Rugged Cables And Connectors Can Take Abuse Microwave and optical cables and connectors currently serve a variety of industries. Yet they always have the common objective of delivering a transmission path for both highspeed digital and high-frequency analog signals. Their diverse capabilities and performance are derived from their design as well as other factors, such as materials. As it does in every industry, design follows demand. In other words, the evolution of such factors is driven... — Nancy Friedrich April 2008 Low-Jitter Modules Generate Clock Signals To 40 Gb/s Billions of cellular telephones and their users worldwide are driving demands for faster communications networks. Optical communications systems support long-distance services and serve as the backhaul communications for wireless networks. At one time, optical communications systems operating at 10 Gb/s (OC-192) may have seemed adequate but, with growing voice, data, and video traffic, optical communications networks carrying data rates of 40 Gb/s ... — A.P.S. (Paul) Khanna April 2008 Eight-Channel ADCs Cut Wireless Power Needs Multichannel wireless applications require a generous complement of signal-processing components. To save space and power in such systems, Texas Instruments has packed a line of eight-channel analogto- digital converters (ADCs) in tiny 9 x 9 mm 64-lead QFN-64 housings. The ADS528x line of data converters offers as much as 12-b resolution at sampling rates to 65 MSamples/s with industry-low power consumption. The ADS528x family includes ... — Jack Browne April 2008 WiMAX May Not Live Up To The Hype WiMAX broadband-access technology might not be able to deliver on its promises after all. The broadband technology, in both fixed and mobile forms, has been billed as the ultimate vehicle for last-mile services. Mobile WiMAX was certain to be deployed in hard-to-reach rural areas. Nobly, it also would provide a communications jumpstart in emerging markets like Africa. At the end of March, however, the Australian edition of Communications Day (... — Nancy Friedrich April 2008 WiMAX And LTE Fight For The US Broadband Mobile Market MARAVEDIS, a research and analysis firm that focuses on BWA technologies including WiMAX, LTE, 802.20, Ultra Mobile Broadband, and Wireless Local Loop, has issued a report. The report focuses on opportunities and challenges for the broadband mobile market in the USA. It offers a comprehensive review of opportunities and challenges for BWA/WiMAX in the US. It also reveals important trends for the mobile broadband industry. Key findings of the report include: ... — Dawn Hightower April 2008 SUIRG Releases Findings Of Field Test Report On C-Band Sharing PUNTA GORDA, FL—The Satellite Users Interference Reduction Group (SUIRG), a non-profit association, announced the findings of a field test on the compatibility of Fixed Satellite Services (FSS) and WiMAX services sharing the C-band spectrum. The test, conducted in late 2007, demonstrated that WiMax communications pose a significant interference threat to satellite signals transmitted in the C-band frequency. The purpose of the test was to validate previous tests... — Dawn Hightower April 2008 Constraints Impact UWB Antenna Performance Solutions for Optimal Waveforms for an Ultra-Wideband (UWB) link have been presented using transmit and receive antennas that are realistic and specific. Yet antenna expert David M. Pozar, who hails from the Department of Electrical and Computer Engineering at the University of Massachusetts (Amherst, MA), asserts that a better approach might be to determine the best performance that can be obtained for any antenna with certain constraints, such as... — Nancy Friedrich April 2008 UHF CPUs Promise To Secure RFID Communications To Attach to Merchandise Ranging from books to fresh foods, radio-frequency identification (RFID) tags need physical flexibility. RFID RF integrated circuits (RFICs) also must be produced at extremely low cost. In addition, they have to be able to provide secure communication. To meet these demands, a 13.56-MHz RF central-processing unit (CPU) with a flexible and a glass substrate was proposed by Hiroyuki Takashina and Yoshinari Yamashita from TDK... — Nancy Friedrich April 2008 OTA Testing Evaluates Mobile-Device Performance OTA Testing Evaluates Mobile-Device Performance To more accurately predict the real-world performance of a mobile device, both standards organizations and network providers are increasingly turning to over-the-air (OTA) testing. The Cellular Telecommunications Industry Association (CTIA), for example, has defined the methods and set the standards for performing OTA testing. In a four-page white paper, RFMD (... — Nancy Friedrich April 2008 Tie WiMAX RF Chipsets To 18-MHz Reference Frequency Tie WiMAX RF Chipsets To 18-MHz Reference Frequency RF chipsets are at the heart of WiMAX solutions for base-station hardware and customer-premise equipment (CPE). The TRF1xxx chipsets from Texas Instruments (www.ti.com), for example, house integrated synthesizers to realize a superheterodyne architecture. To achieve optimal channel resolution, these devices must be tied to an 18-MHz reference frequency.... — Nancy Friedrich April 2008 100-W SSPA Targets Ku-Band 100-W SSPA Targets Ku-Band To provide low-cost operation and longevity for satellite-communications (satcom) customers, a compact, 100-W, solid-state high-power amplifier (SSPA) has been introduced in an integrated antenna-mount package. This SSPA, which is dubbed the model XTS-100K1, is designed for satcom operation at 14.0-to-14.5-GHz Ku-band frequencies and optionally available in a version for use at 13.75 to 14.5 GHz. Thanks to its antenna-mount approach,... — Nancy Friedrich March Ku- And Ka-Band PAs Offer Gain Above 27 dB Ku- And Ka-Band PAs Offer Gain Above 27 dB To satisfy both Ku-band very-small-aperture-terminal (VSAT) networks and emerging Ka-band broadband-satellite-communications applications, two new power amplifiers vow to deliver superior power and linearity performance. The Ku-band module boasts a minimum of 40 dB gain and 0.5 dB maximum gain flatness. Typical output power at 1-dB compression (P1dB) is +37 dBm while the typical output third-order intercept is +47 dBm. At... — Nancy Friedrich March Noise Source Promises +/-0.25 dB Flatness Over 10 kHz To 3 GHz Noise Source Promises +/-0.25 dB Flatness Over 10 kHz to 3 GHz To reduce measurement uncertainty in broadband applications, a coaxial noise source features typical flatness of +/-0.25 dB over the entire frequency range of 10 kHz to 3 GHz. The NW3G-CS comes with calibrated, cardinal excess-noise-ratio (ENR) frequencies. The noise source is available in 15 and 30 dB ENRs. Standard operation is from +28 VDC with a 20-mA maximum current draw. The... — Nancy Friedrich March 90-nm CMOS Module Advances Mobile WiMAX By leveraging 90-nm CMOS technology, a 15-x-15-mm RF module is able to integrate an RF integrated circuit (RF IC), antenna switches, power amplifier, filters, and oscillator circuit. In doing so, it promises to reduce the form factor of mobile WiMAX devices. The 94-pin MB86K71 operates from three voltages: 1.2, 2.925, and 3.3 V. It covers the 2.496-to-2.69-GHz band. Bandwidth is 5 and 10 MHz. For wireless access, the module relies on 512/1024 Fast Fourier Transform... — Nancy Friedrich March 19.7-MHz Chebyshev LPF Targets IEEE 802.11n The IEEE 802.11n wireless-local-area-networking (WLAN) standard employs a high-throughput extension option. As a result, a WLAN system’s bandwidth can be 40 MHz in support of higher data rates. When the direct-conversion architecture is employed for these systems, a lowpass filter (LPF) with a bandwidth of 10 and/or 20 MHz is required. The design of a wideband LPF involves the selection of both the filter inductor-capacitorresistor (LCR) prototype (i.e.,... — Nancy Friedrich March Affordable CPE Equipment Will Drive WiMAX Into Emerging Markets In the last two years, the fixed/portable broadband-wireless-access (BWA) equipment market (sub-11-GHz) more than doubled. According to Maravedis, it grew to $1.2 billion in 2007—up from $562 million in 2005. Despite the doubling of the market, the success of WiMAX depends on reaching a critical mass in underserved and developed markets. The higher-volume production of chips, antennas, and other components must occur. Such production will drive down the... — Nancy Friedrich March Nujira And TTP Demonstrate High-Efficiency RF Power Amplifier Cambridge, UK and Mobile World Congress, Barcelona, Spain— Nujira has announced the successful demonstration of ultrahighefficiency RF power amplifier (PA) operation with DVB OFDM signals, supported by TTP and the Carbon Trust. “This demonstration shows that the power efficiency savings that Nujira has demonstrated with WCDMA and WiMAX can be achieved with even greater effect for OFDM-based mobile and digital TV standards at UHF, such as DVB-T, DVB-H, ISDB-T and ... — Dawn Hightower  prev. page
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