FPGA-based Applications for Software Radio 

May 1, 2004, By Angsuman Rudra

Software radio technology offers the ability to develop radio architectures with programmable intermediate frequency, bandwidth, modulation and coding schemes. Field-programmable gate array is important in multimission software radio applications like electronic warfare, radar, communications and RF testing....

High-speed 14-bit DAC breaks 1 Gsps barrier 

Apr 1, 2004

Combining 0.18 m CMOS process with patent-pending switch current array, designers at Analog Devices have developed an unmatched 14-bit digital-to-analog...

Broadband monolithic S-band class-E power amplifier design 

Apr 1, 2004, By Reza Tayrani

Highly efficient microwave and RF power amplifiers are required for many commercial as well as defense system applications. These include wireless LANs,...

Little known characteristics of phase noise 

Mar 1, 2004, By Paul Smith

A wealth of information is available on the topic of phase noise, its A characteristics, how it can be measured, and how it affects system performance....

Field trials of an all-software GSM base station 

Mar 1, 2004, By Jeffrey Steinheider

As part of the Mid-Tex Cellular radio access network, Vanu, Cambridge, Mass., installed a software radio GSM base station in DeLeon, Texas, in June 2003....

Microfabricated next-generation millimeter-wave power amplifiers 

Feb 1, 2004, By Larry Sadwick, Jennifer Hwu and Dean Anderson

With the need for more band width and security, military communications systems are moving higher up on the spectrum scale. These systems are driving...

Synthetic instrumentation: An emerging technology (Part I) 

Feb 1, 2004, By Mike Granieri

A synthetic instrument (SI) synthesizes the stimulus and/or measurement functionality found in traditional instruments by using a combination of core...

Understanding the Discrete Fourier Transform 

Jan 1, 2004, By R. N. Mutagi

Discrete Fourier Transform (DFT) is used extensively in signal processing applications such as communications, broadcasting, entertainment and many other...

Maury Microwave and Modelithics form alliance 

Nov 14, 2003, RF Design Staff

Ontario, Calif. -- Maury Microwave Corp. announced that it signed an agreement with Modelithics Inc. to advance the application of load/source pull measurement for more efficient non-linear device modeling and circuit design....

FCC makes additional spectrum available for unlicensed use 

Nov 14, 2003, Bill McCarthy, MRT Magazine

Washington, D.C. -- The Federal Communications Commission (FCC) made available Thursday an additional 255-megahertz of spectrum in the 5.470-5.725 GHz...

Ericsson awarded Bluetooth license agreement by Winbond 

Nov 14, 2003, RF Design Staff

Stockholm -- Ericsson Technology Licensing announced a licensing agreement with Winbond Electronics Corp., a Taiwanese semiconductor manufacturer....

A monolithic X-band Class-E power amplifier for space based radar systems 

Nov 1, 2003, By Reza Tayrani

Low cost, highly efficient, high power, microwave and RF amplifiers are required for many commercial and defense system applications. These include WLANs,...

Multitone IMD offers clearer picture of MCPA performance 

Sep 1, 2003, By Marta Iglesias

Characterizing distortion is essential when evaluating multicarrier power amplifier (MCPA) performance. Traditional two-tone tests for intermodulation distortion (IMD) or single-carrier adjacent channel power ratio (ACPR) measurements are not sufficient to evaluate MCPAs. These amplifiers must instead be evaluated using multiple carriers as the stimulus, which more realistically simulate conditions the amplifiers will encounter in service. As an alternative to multiple carriers, multiple tones w...

Microwave PA Thermal Design for SATCOM Systems 

Jan 1, 2003, By Stephen D. Turner, and Ahmed M. Zaghlol

For many years, solid state power amplifiers and traveling wave tube amplifiers have been in competition in communication services. This is particularly so in satellite communication systems. Currently, the highest RF output power achievable from microwave transistors is 60 W at 6 GHz and 20 W at 14 GHz. Not only is the DC to RF efficiency a concern, but the RF combining efficiency is also critical to the success of a solid state power amplifier....

EDGE Modulation — How Linearization Improves Amplifier Performance 

Oct 1, 2002, By T. J. Fergus

Historically, the global system for mobile Communications was intended to make power amplifier design simpler. With the introduction of high order modulation schemes for 2.5 and 3G, the design challenges presented to the PA have increased significantly. This article describes the design and implementation of a polar loop to improve the efficiency of a gallium-arsenide field effect transistor (GaAs FET) power operating at 1.91 GHz....

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