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Industry News

Automation and Real-time Verification of Passive Component S-parameter Measurements Using Loss Factor Calculations

An automated S-parameter testing approach, built around a LabVIEW program, is described that adds important capabilities to a microwave test setup. A real-time check on S-parameter data using total loss calculations is shown to be a good indicator of m...
March 27, 2004
In developing microwave models, real-time verification of characterization data should be considered a priority to ensure its integrity. Sound models must be built upon accurate measurement data, and, as is generally the case, the ‘garbage in – garbage out’ principle applies to model extraction. Even if an instrument calibration...
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Trigger-Capture-Analyze: Three Steps Toward Understanding Today's Complex RF Signals

March 27, 2004
The recent proliferation of new RF applications has brought about a dramatic increase in spectrum usage, particularly in the unlicensed bands used by many of the new devices. Crowding virtually guarantees the presence of RF interference. This has led to adaptive techniques that can change power, data rate and...
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Noise Can Be Good, Too

March 27, 2004
In communications, noise is an annoying phenomenon. Noise occurs naturally and is random, contrary to human-engineered intelligence. Engineers define the signal-to-noise ratio as the most important quantity that qualifies any information-transmitting system fit or unfit for use. Researchers utilize sensitive radio and microwave receivers (sometimes also transmitters) to obtain...
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Increasing RF Device Test Throughput with Better Instrument Coordination

Knowledgeable use of the programmability of today’s multi-function instruments can go a long way toward reducing test costs and improving manufacturing productivity.
March 27, 2004
Testing speed is important for all electronic components, but it is vital for low price two- and three-terminal devices such as diodes and transistors. Before RF tests can be conducted, the devices must be tested for DC operation. For diodes, that includes forward voltage, reverse breakdown voltage and leakage...
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New Behavioral Models Facilitate Fast and Accurate Simulation of Sigma-delta Fractional-N Synthesizers Using Ansoft Designer™

By offering extremely low phase noise combined with fast acquisition times, Sigma-delta fractional-N synthesizers are ideally suited to meet the requirements for the emerging 2.5 and 3G digital wireless services, including General Packet Radio Service ...
March 27, 2004
Fractional-N synthesizers are highly desirable in communication systems because of their high frequency resolution output. This resolution is made possible by dithering the divide value using the output of a sigma-delta modulator. A typical sigma-delta fractional-N frequency synthesizer is shown in Figure 1 . The tri-state phase frequency detector...
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Pitfalls to Avoid When Using Load-pull Contours for PA Design

March 27, 2004
Load-pull testing of power transistors usually employs wideband electromechanical tuners. Harmonic signal components, generated by a nonlinear device under test (DUT), must be terminated with known impedances in order to generate a meaningful set of data. This is not possible if a harmonic load-pull set-up is not available, in...
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New Products

March 27, 2004
NEW WAVES: TEST, MEASUREMENT AND CAD EM-based Componen and Circuit Design Software This version 6.2 of LINMIC is a microwave/ RF IC design suite that has revised the active device modeling for ease of use and for parameter extraction including detailed control of model quality. Aside of lumped device...
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Around the Circuit

March 27, 2004
Industry News PCTEL Inc. announced that it has completed the acquisition of MAXRAD Inc. , a manufacturer of wireless communications antennas for broadband wireless, in-building wireless and land mobile radio applications. PCTEL acquired all of the shares of MAXRAD, a privately held company, for $20 M. MAXRAD generated approximately...
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Web Update

March 27, 2004
Ultra-precision Service This company’s Web site offers a complete ultra-precision service for grinding, lapping, polishing, diamond sawing, laser machining and sizing a wide variety of metals (ferrous and non-ferrous). The company also offers carbide, ceramic, sapphire and other materials for industrial and scientific applications in the telecommunications, semiconductor, communications,...
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Rockwell Collins Joins Northrop Grumman-Raytheon Team

March 27, 2004
The US Missile Defense Agency announced the award of an eight-year contract for the design, development and build of the kinetic energy interceptor (KEI) missile defense system to a Northrop Grumman and Raytheon team, supported by Rockwell Collins. The KEI system is intended to provide the US with the...
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