Microwave Engineering Europe - May 2008 - (Page 33)

PRODUCTS 33 Two-way power divider handles up to 250 W from 500 MHz to 2.5 GHz Narda, an L-3 Communications company has introduced the Model 2372A-2 high-power, two-way power divider that operates from 500 MHz to 2.5 GHz, handles up to 250 W CW input power (2 kW peak power), and provides exceptional phase and amplitude balance. The power divider incorporates proprietary highpower, thin-film resistors that ensure broadband impedance matching and high isolation between inputs when used as a combiner rather than a divider. These resistors are directly attached to the housing through the use of spreading pedestals that optimize thermal transfer so the film temperature remains stable throughout the unit’s range of operating temperatures. The resistor design and Ku band TWT high power to 1000 W peak, 400 W continuous Responding to customer demand, TMD Technologies is now offering a higher power, fast warm, Ku band travelling wave tube (TWT). Peak power for the PT6789 is 1000 W, with an average power of 400 W continuous or 600 W for short periods. Designing this TWT was a considerable technical feat as it operates at the top of the Ku radar band, at a high duty of up to 33 percent, and at very high pulse repetition frequency. The tube is also required to work in a harsh environment. attachment scheme have also been optimized to present the least possible mismatch to the broadband circuit. Other specifications of the Model 2372A-2 include insertion loss of less than 0.6 dB, amplitude balance of ±0.25 dB or less, phase balance of ±5 degrees, isolation of at least 13 dB to 700 MHz and 18 dB to 2.5 GHz, and VSWR of less than 1.5:1. The unit employs Type N connectors and measures 8.9- x 6.4- x 2.5-cm). www.mwee.com/207402057 Currently the PT6789 is not optimised for any specific application, but the company can tailor performance to a customers’ particular requirements. www.mwee.com/207402056 PA boosts Wi-Fi performance high linearity, lower BOM requirements SiGe Semiconductor’s SE2587L power ampliﬁer (PA) delivers excellent linearity at transmit power levels of +19 dBm in 802.11g mode and +24 dBm in 802.11b mode. The high linearity optimizes transmission of greater data rates over longer distances and enables systems to support emerging wireless multimedia applications such as video distribution, video streaming and high-speed data. Packaged in a 3x3 QFN package, the SE2587L is the smallest of SiGe Semiconductor’s discrete power ampliﬁers. Its pin-out sequence is compatible with the company’s widely used SE2527L, SE2528L and SE2581L, minimizing the layout changes and allowing manufacturers to easily migrate to the new device for next-generation designs. SiGe Semiconductor offers application notes and support to replace discrete inductors used for output matching to patterned-on traces, taking advantage of the board space freed by the smaller footprint of the SE2587L. This could result in a savings of about 20 percent off the external bill of materials (BOM), according to the company. The SE2587L is based on the company’s proven power ampliﬁer architecture optimized for 802.11b and 802.11g operation. Leveraging an advanced silicon germanium technology, the power ampliﬁer claims to feature a market-leading combination of linearity, accuracy and stability. The power ampliﬁer is characterized for both 3.3 V and 5 V operation for nominal and high power applications, respectively. SiGe integrates the reference voltage generator on-chip, allowing the PA to be enabled with a standard 1.8 V CMOS digital signal, and eliminating the large and current hungry external reference voltage generators. The power ampliﬁer also integrates power detector that maintains accuracy even under high antenna mis-match. www.mwee.com/207401129 Integrated configurable component line delivers functional integration in radio systems RF Micro Devices has introduced the ﬁrst in a line of integrated conﬁgurable components delivering high levels of ﬂexibility and functional integration to designers of radio systems. The ﬁrst products include RFMD’s RF2051, RF2052 and RF2053. The RF205x line of integrated conﬁgurable components integrate common RF functions while retaining the ﬂexibility designers require to develop radio systems that operate over a wide dynamic range and across a broad range of frequencies and channel bandwidths. Applications include multiple radio markets, including wireless repeaters, software deﬁned radios (SDR), professional mobile radios and instrumentation and test equipment. Each product in the RF205x line is able to generate a broad LO signal range (300 MHz to 2.4 GHz) and operate over a broad RF/IF range (100MHz to 2.5 GHz). The LO, which consists of the VCO and PLL, has an adjustable loop bandwidth that is set by a passive or active loop ﬁlter, allowing designers to optimize performance in wideband and narrowband applications. Each product offers an operational ampliﬁer on-chip to eliminate the need for an external ampliﬁer in active loop conﬁgurations. The mixer linearity is programmable up to +18 dBm, at which the mixer, PLL and VCO consume 72 mA from a 3-V supply. www.mwee.com/207402070 Microwave Engineering ● May 2008 ● www.mwee.com http://www.mwee.com/207402056 http://www.mwee.com/207402057 http://www.mwee.com/207402070 http://www.mwee.com/207401129 http://www.mwee.com

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Microwave Engineering Europe - May 2008 News Contents Comment Cover Feature: How to Succeed as a GaAs Foundry Wireless Networking: Wireless Coverage Where Everybody WINS Wireless Networking: Achieving Good Coexistence in the 2.4 GHz ISM Band GPS and Satellite: GPS developments: Galileo Moves Forward with Successful Giove-B Satellite Launch — Broadcom Targets AGPS in Mobile Phones and Devices Raising the Bar for the Radio: Making 802.11n Work Reducing Power Consumption in Ultrawideband Chips WiMax Catches Second Test Wave Products Calendar

Microwave Engineering Europe - May 2008

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