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Test and Measurement

Agilent Technologies announces development of MB-OFDM modulation analysis capability for WiMedia-based UWB applications

Agilent Technologies Inc. (NYSE: A) today announced the development of a full-featured, MB-OFDM (multi-band orthogonal frequency division multiplexing) ultra-wideband modulation analysis capability for its 89600 Series vector signal analysis software. Featuring a comprehensive set of measurements and excellent error vector magnitude specifications, R&D developers can troubleshoot MB-OFDM ultra-wideband signals at any stage of the design process and more quickly identify the root cause of any potential problem in wireless USB and ultra-wideband (UWB) components, subsystems and systems.
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Miniature Ultra-high Speed Synthesizer for 2.25 to 18 GHz Applications

A new miniature wide band frequency synthesizer has been introduced that operates from 2.25 to 18 GHz, permits 3 ms tuning, exhibits a volume of 334.3cc (20.4 in 3 ), consumes just 22 W of DC power and provides a clean RF output spectrum with an absolute accuracy better...
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Cavity Techniques for Substrate Properties at Microwave/Millimeter-wave Bands

For quality control in the design of microwave and millimeter-wave circuitry and devices, it is important to have a good measure of the dielectric properties of the materials employed. The standards and methods that are often employed for this purpose ...
The setups presented are essentially of two types - thin dielectric sheet testers and z-axis testers. These are the tools that are employed to independently measure the components of the substrate dielectric constant. It is supposed that suitable propagation models may use this information to better predict propagation mode...
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Subminiature Broadband Coaxial Switches for VXI Applications

In recent years the VXIbus architecture has proven to be a versatile interface standard for instruments from many diverse manufacturers to operate within the same mainframe. The VXIbus incorporates the user-friendly features of instruments designed to operate within the General Purpose Interface Bus (GPIB) (for example, using ASCII-level programming)...
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Recent Advances in EDA Software Solutions for Improved RFIC Design Flows

Today's wireless world requires unrelenting technological innovation. From cell phones that take and send photos to homeland security, the demands on wireless designers for increasing complexity at lower prices and faster time-to-market are immense. Advances in electronic design automation (EDA) over the last decade have made possible dramatic improvements...
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100 W Hot Switching Programmable Attenuators

In order to test high power amplifiers used in today's cellular base station equipment it is sometimes necessary to perform automated switching of the high power amplifiers without shutting down the system to make the RF connection. The high power RF signal must be diverted from the main signal...
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AWGN Generators with Precise Control of Resolution and Noise Density

Additive white Gaussian noise (AWGN) has proven itself over the years as a simple yet extremely valuable tool in measurements ranging from BER and SINAD testing to wireless link emulation and the overall characterization of communications receiver performance. The unique characteristics of AWGN are becoming even more useful now...
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A Two-path Vector Signal Generator

Setting new standards in flexibility and performance and opening the possibility for new applications, the R&S SMU200A is said to be the first high end generator to combine two complete digital signal generators with modulation capabilities in one instrument. It provides space for up to two RF paths in...
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Cross-modulation in a CDMA Mobile Phone Receiver

Determining cross-modulation interference is an important factor in the design of a code division multiple access (CDMA) mobile transceiver. The cross-modulation interference level directly affects the performance of the receiver's ability to overcome the spurious interferences, such as what the IS-98 1 calls single tone desensitization. A few papers...
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The Concept of Predistortion

The intention of this article is to provide a tool for the design of a predistorter, a component intended to correct unwanted nonlinear effects in power amplifiers. In order to come up with a design, a concept of predistortion is discussed. The conclus...
This article continues the trend of previous publications, 1,2 to simplify the prediction of RF performance of systems designed for wireless digital communications. The first shows the correlation between sidelobes and intermodulation (IM) products. Sidelobes are the result of the spectrum re-growth when a digitally modulated signal is applied...
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