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November 2010 [Components] Compact VCOs Expand Bandwidth While Cutting Phase Noise Engineers continuously work to achieve wider tuning ranges at higher frequencies with much lower phase noise and higher stability in voltage-controlled oscillators (VCOs). At the same time, they are pressured to offer such VCOs in miniature packages. Meanwhile, a variety of circuit techniques—both old and new—are being exploited to overcome current performance limitations. Using improvements in proprietary planar-resonator technology (also called compactcoupled- ... September 2010 [Components] Limit Losses In Coaxial Cable Assemblies Loss is inevitable in coaxial cable assemblies. But with improved materials, refined construction techniques, and high-quality connectors, manufacturers of flexible and semi-rigid cable assemblies are continuing to meet more stringent requirements for a variety of applications. They are improving performance while maintaining flexibility and reliability—without inflating prices. “Many users seem to believe that there is some magic in low-loss coaxial cables but, in ... July 2010 [Components] Integration Paves Way For Compact PA Modules May 2010 [Test & Measurement] Precision Cables Preserve Microwave Measurement Accuracy Precision cables are usually the last addition to a microwave test system. Often, they are an afterthought. The wrong cables, however, can add unstable electrical characteristics to the system and unreliable test results. For that reason, it is important to select coaxial interconnects for testing with great care. It is best to choose cables that will not only deliver phase and amplitude stability and low loss, but are rugged and reliable. For use with... May 2010 [Components] Hybrid Combiners Add Channels With Low PIM Signal combining in cellular base stations and other systems requires components with high isolation between signal paths, low loss in those paths, and minimal passive intermodulation distortion (PIM) added to the signals. As the number of signals increases and bandwidth broadens, the requirements of radio base stations, distributed antenna systems (DASs), and in-building cable distribution networks have spurred designers of hybrid combiners to new... March 2010 [Components] GaN Power Transistors Gain Ground In Military And Commercial Applications January 2010 [Components] Shrinking Directional Couplers Boost Power And Bandwidth Directional couplers are often needed to monitor incident or reflected power, sample signals, or inject signals onto transmission lines. These passive components are critical to power-measuring instrumentation and communication systems. By combining construction techniques with simulation software, directional-coupler makers have been able to reduce real estate as they boost the power-handling capability of their units at higher frequencies and with broader bandwidths. A large... November 2009 [Components] Surface-Mount Isolators/Circulators Shave Size And Insertion Loss November 2009 [Components] Power Amps Boost Multimode, Multiband Signals May 2009 [Components] Copper Cable Assemblies Challenge Optical Performance May 2009 [Computer-Aided Engineering] Passive Simulation Models Gain Accuracy and Scalability July 2009 [Components] RF Adapters Gain Bandwidth While Lowering Return Loss July 2009 [Components] Device Advances Lead To Lower LNA Noise Levels September 2009 [Components] VCOs Deliver Expanded Coverage In Smaller Packages September 2009 [Components] Low-Profile QSFP Cables Handle Faster Data Rates Over Longer Distances August 2009 [Devices & ICs] Sources Shave Phase NoiseFor Millimeter-Wave Applications Phase noise limits the performance of many high-frequency systems from electronic-warfare (EW) to test equipment. But new low-noise transistors are making possible a score of higherfrequency oscillators and synthesizers with outstanding spectral purity to meet the performance requirements of existing and emerging systems. At Micro Lambda Wireless, for instance, designers are replacing... March 2009 [Components] Power Dividers/Combiners Rise In Frequency, Shrink In Size March 2009 [Communications] PA Modules Are Tailored For Femtocell Base Stations July 2008 [Devices & ICs] Semiconductor Advances Propel High-Power Amps Improved linearity is one of the requirements for an effective wireless commuications transition from 2G series to 3G/4G systems, and high-performance RF transistors are vital to the amplifiers in these newer systems. As network operators transition from 2G services to 3G/4G systems, the role of highly efficient, highly linear RF transistors with higher operating voltages in base station amplifier designs become critical. Consequently, the technology that was... |
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