Microwave Engineering Europe - March 2008 - (Page 40)

40 PRODUCTS High performance receiver subsystem bridges the gap between RF and digital worlds Linear Technology has introduced the LTM9001, the first in a series of Systemin-a-Package (SiP) signal chain receiver modules, leveraging the company’s breakthrough uModule™ packaging technology. This new family of integrated receiver subsystems is intended to bridge the expertise gap between the RF world and digital domain to provide ease of use and shortened time to market. Sampling high dynamic range signals in RF applications requires extensive experience to maximize the full capabilities of the analog-to-digital converter. An intimate knowledge of the amplifier output stage and ADC front end is required to match the impedances, while careful attention to layout is required to minimize coupling of the digital outputs into the sensitive analog input. Degraded ADC performance can in many cases be attributed to bad layout. These considerations can challenge the engineer whose expertise lies in the RF or digital worlds. The LTM9001 transfers this burden of component selection, input impedance matching, filter design and layout from designer to device, shortening overall design time, system troubleshooting and ultimately improving time to market. The beauty of the LTM9001 lies in its semi-customization (customization requires minimum order quantity). Using pin-compatible product families, the module can be configured for various sampling rates and the differential ADC driver can Test cables suitable for applications up to 18 GHz Times Microwave Systems has recently extended its successful line of SilverLine™ QMA test cables to cover applications in the microwave market. The company’s latest QMASMA, QMA-Type N and QMATNC adaptors exhibit excellent frequency response, making them suitable for use up to 18 GHz for most microwave applications. SilverLine test cables with QMA plug and QMA jack adaptor deliver a low VSWR of 1.30:1 through 18 GHz. Also improved are the ruggedness and durability of the QMA interface, doubling the mating life. Key features and benefits include snap on, pull off adaptors, 18 GHz operation be substituted for fixed gain versions ranging from 8 dB up to 26 dB. The anti-aliasing filters can also be configured as Low-Pass or Band-Pass filter versions, accepting input frequencies as high as 300 MHz. The LTM9001 is packaged in a 11.25 mm x 11.25 mm LGA package, utilizing a multi-layer substrate that shields sensitive analog lines from the digital traces. The LGA pads are positioned on the bottom of the package so that input and clock signals are separated from the digital outputs, simplifying the layout for the designer. Bypass capacitance is placed inside the module and close to the die, providing a space, cost and, more significantly, a performance advantage over traditional packaging. With no external capacitance required, the LTM9001 consumes approximately half the space of the discrete implementation. Other features include a noise figure as low as 5.9 dB, input impedances of 50, 200 or 400 Ohms, SFDR of 82 dB, SNR of 72 dB, integrated bypass capacitance, optional internal dither, optional data output randomizer, LVDS or CMOS outputs, 3.3V single supply, 1.65 W power dissipation and clock duty stabilizer. www.mwee.com/206104913 (SMA, Type N, TNC), a 5000 mate life cycle, 360 degree DUT (Device Under Test) rotation while mated with little or no performance change, as well a durable, all stainless steel construction. A full complement of 29 coaxial adaptors for 2-way, RF and microwave use are currently are available in both plug and jack configurations. www.mwee.com/206103579 Analog signal generator compact size, fast frequency switching speeds Agilent has announced a compact microwave analog signal generator that delivers a low cost of ownership and is an extension to the popular Agilent MXG signal generator platform, providing frequency coverage to 20, 32 or 40 GHz. Featuring fast frequency switching speeds, high reliability and easy selfmaintenance, this midperformance signal generator targets manufacturing and R&D engineers that need to carry out a wide range of broadband measurements. It is especially well suited for EW, radar, military communications and broadband wireless access applications. The Agilent N5183A MXG is an economy class, continuous wave (CW) signal generator speciﬁcally designed to maximize uptime and reduce cost of ownership. Its less than or equal to 900microsecond switching speed enables a dramatic increase in throughput. A simple design delivers easy self-maintenance that reduces downtime to one working day, making it possible for users to maintain or repair the instrument inhouse. Another key feature of the N5183A MXG is high performance — delivering a combination of high output power and excellent level accuracy. With +18 dBm to 20 GHz output power, it is able to overcome losses and drive high-power devices. Additionally, it features a level accuracy, with optional step attenuator, of ±0.6 to 0.8 dB. www.mwee.com/206103548 Microwave Engineering Europe ● March 2008 ● www.mwee.com 040_MWEE.indd 40 22/02/08 12:09:42 http://www.mwee.com/206103579 http://www.mwee.com/206104913 http://www.mwee.com/206103548 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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