Microwave Engineering Europe - March 2008 - (Page 37)

PRODUCTS 37 WiMAX RF transceiver saves 50 percent BOM cost Maxim Integrated Products has introduced the MAX2838, a single-chip WiMAX RF transceiver in high-volume production. It eliminates the costly SAW ﬁlter and extra VCO circuitry required by existing superheterodyne solutions, thus saving 50 percent BOM cost, signiﬁcant component count, and board space. Ideal for low-cost, 802.16d/802.16e WiMAX CPE products operating in the 3.3- to 3.9-GHz band, the MAX2838 enables affordable wireless broadband services in BRIC countries (Brazil, Russia, India, China), as well as in Western Europe, Australia, and Canada. Integrating monolithic baseband ﬁlters for both the receiver and transmitter eliminate the need for external SAW ﬁlters. An SPI-compatible interface enables electronic programming of channel ﬁltering to support multiple channel bandwidths from 1.5 MHz to 28 MHz. Such wide bandwidth support allows one radio BOM to support virtually all geographic markets where channel bandwidths differ according to each country’s spectrum regulations. Based on the company’s in-house, highperformance SiGe BiCMOS process, the chip’s receiver side features a low noise ﬁgure of 2.8 dB, input IP3 of -11 dBm and integrated VCO phase noise of -39 dBc, while consuming only 288 mW. The receiver has a 94-dB gain-control range, digitally controlled in 2-dB steps, while EVM is better than -35 dB, and sideband suppression is over 45 dB. The IC’s transmitter features a 60-dB gain-control range, digitally controlled in 1-dB steps. It delivers a 0 dBm linear output with a 64-QAM signal, sideband suppression of over 45 dB, and EVM of better than -36 dB while meeting a -70-dBr spectral mask. A special master/slave mode allows two MAX2838 transceivers to operate in MIMO (multiple-input-multiple-output) or MRC (maximal-ratio-combining) conﬁgurations for improved system range and data throughput performance. The chip operates from +2.7 to +3.6 V and comes in a small, 6-mm x 6-mm, leadless, 48-pin TQFN. www.mwee.com/206800066 VSAT power amplifier targets high efficiency requirements well behaved IM3 performance over frequency, temperature, and power Tyco Electronics has released the M/ACOM MAAPSS0111, a 13.75- to 14.5GHz, four-stage, 1.25-W power ampliﬁer speciﬁcally designed for Very Small Aperture Terminal (VSAT) applications that require high efﬁciency. The ampliﬁer can be used as either a driver or an output stage ampliﬁer. A key ﬁgure of merit for ampliﬁers in communication systems is the intermodulation performance of third order products, denoted IM3. The MAAPSS0111 has well behaved IM3 performance over frequency, temperature, and operating power which will enable high data rate communication in next generation VSAT applications. The ampliﬁer is designed to generate 31-dBm of saturated output power while drawing 530-mA of current. It has a typical power gain of 32 dB with an operating voltage of 8.0 V and typical IM3 of 26 dBc. The ampliﬁer is housed in a RoHS compliant 6-mm, 28-lead PQFN package. www.mwee.com/206800068 Microwave Engineering ● March 2008 ● www.mwee.com 037_MWEE.indd Sec1:37 18/02/08 17:16:15 http://www.mwee.com/206800066 http://www.omniyig.com http://www.mwee.com/206800068 http://www.omniyig.com http://www.mwee.com

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Microwave Engineering Europe - March 2008 News Contents Comment Wireless Infrastructure: A Direct Conversion I/Q Demodulatordrives Favorable Basestation Cost-performance Metrics Wireless Infrastructure: Mobile World Set to Reshape the Internet RF Amplifiers: Latest Advances in RF Amplifiers Include a CMOS PA Operating at 77 GHz and Significant Advances in PAs for WiMAX and Broadband Applications Many Applications Still Require Unique Performance Benefits of BeO ACE Automated Circuit Extraction Returns to Real Design by Exploring Design Alternatives and Changes in Seconds Exceeding the Standard for Wireless Sensor Networks Products Calendar

Microwave Engineering Europe - March 2008

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