Microwave Engineering Europe - November 2007 - (Page 34)

34 PRODUCTS RF transceivers for mobile WiMAX applications significantly reduce power consumption Analog Devices has introduced RF-to-digital baseband transceivers designed to enable the IEEE 802.16d/e mobile WiMAX (Worldwide Interoperability for Microwave Access) standard for mobile communications devices. Building on the company’s AD9352 and AD9353 family of integrated WiMAX transceivers introduced in 2006, the AD9354 and AD9355 consume less power than other transceivers in their class and are available in a 20 percent smaller package, while adding an additional receiver path for multipleinput multiple-output (MIMO) support. The power and space savings of the devices enable manufacturers to incorporate WIMAX functionality into handsets, thumb drives or PCMCIA cards. By integrating ADCs, DACs and real-time control and calibration loops, the transceivers enable designers to eliminate all analogue and RF functionality from their baseband processors. The AD9354 and AD9355 transceivers integrate two direct-conversion receivers that provide support for MIMO technology, which ensures mobile devices achieve uninterrupted WiMAX service. The direct-conversion transmitter architecture achieves state-of-the-art error vector magnitude (EVM), maximising network throughput. The transceivers communicate with a WiMAX terminal’s baseband ASIC or FPGA using the industry standard JESD207 digital interface that Analog Devices helped to deﬁne. The data bus requires 13 pins, which is comparable to competitive products employing analogue interfaces. On-chip data conversion and a second receiver signal chain in the transceiver architecture, helps communications service providers extend WiMAX into the mobile marketplace, The AD9354 and AD9355 cover the key WiMAX frequency bands and are ideally suited for the small form factors in development. www.analog.com Low-Noise GaAs HEMT suitable for KU Band LNAs Mitsubishi Electric Corporation has introduced the MGF4941AL GaAs HEMT (High Electron Mobility Transistor), which is mainly intended for use in the KU band. Typical applications are first stage LNAs (lownoise amplifiers) for down converters in DBS (Direct Broadcast Satellite) and VSAT (Very Small Aperture Terminal) receivers operating in the 10 to 12 GHz range. At a frequency of 12 GHz the HEMT provides a power gain of 13.5 dB. Compared to its predecessor, the MGF4953A, the MGF4941AL’s gain is 0.5 dB better. Further, noise figure is as low as 0.35 dB for the plastic mold device. www.mitsubishichips.com 4-GHz attenuators for WiMax, WiFi & WiBro Coaxial Dynamics has announced the broadband 6902-BNCF series of 2-W BNC attenuators rated from DC to 4 GHz, which includes WiMax, WiFi and WiBro testing applications. VSWR is 1.25:1 maximum through 4 GHz and the accuracy is ±0.3 dB to 6 dB, ±0.5 dB to 20 dB and ±0.75 dB to 30 dB. Standard dB values include 3, 6, 10, 20 and 30 dB with others available on special order. All BNC models have bi- directional operation and other connector types are available. www.coaxial.com Thin-fim low-pass filters target space sensitive applications State of the Art (SOTA) has added more thin film low pass filters to its high frequency product line. The low pass filters come in a sub-miniature case size and are available on 99 percent alumina substrate constructed using high stability thin film planar technology. Further, 50 ohm terminations are available for either solder of epoxy mounting. The filters feature passband cutoffs at 5.5, 7 and 8 Ghz, rejection greater than 16 dB, maximum, and VSWR characteristics of less than 1.4:1, with a insertion loss of less than 0.5 db. The company’s low pass filters were designed to eliminate the need for use of multiple components where space use is critical. The filters offer several standard designs and custom cut-off frequencies including high reliability screening. Typical applications include reducing or eliminating unwanted harmonics in satellite receivers, GPS systems, wireless LANs and WiMAX networks. www.resistor.com 800 - 1600 MHz VCO high linearity in an SMD package Crystek’s CVCO55CW-08001600 VCO operates from 800 MHz to 1600 MHz with a control voltage range of 0.5 V to 19 V. The VCO features a typical phase noise of -100 dBc/Hz at 10kHz offset and high linearity. The VCO comes in an industry standard 0.5-x 0.5-inch (1.27- x 1.27-mm) SMD package. Input voltage is 11.5 V, with a maximum consumption of 30 mA. Pulling and Pushing are minimized to 5.00 MHz and 1.00 MHz/V, respectively. Second harmonic suppression is -10 dBc typical. Applications include digital radio equipment, fixed wireless access, satellite systems, and base stations. www.crystek.com Microwave Engineering Europe ● November 2007 ● www.mwee.com 034_MWEE.indd 34 26/10/07 14:04:45 http://www.mitsubishichips.com http://www.analog.com http://www.coaxial.com http://www.resistor.com http://www.crystek.com http://www.mwee.com

Table of Contents Feed for the Digital Edition of Microwave Engineering Europe - November 2007

Microwave Engineering Europe - November 2007 Contents News Comment Metamaterials: Metamaterials Tackle Communications Wavelengths Microwave Components — EM tools: Microwave Component Design Easier With New EM and EDA Tools Cover Feature: RF Testing for OFDMA in LTE Base-Stations Startup Eyes Battery-Free Wireless Sensor Nets High-speed ADC Technology Paves the Way for Software Defined Radios Planning a WiMAX network: Maximising the ROI by Using Advanced Optimisation Tools Transporting Video Over Wireless Networks Ultrawideband Under the Gun Specifying the Proper SAW Filter Products Product Feature: RF Test Solution Supports Emerging 4x4 MIMO as Well as Multiple Commercial Standards Calendar

Microwave Engineering Europe - November 2007

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