Improving amplifier's efficiency using a Linearizer in Conjunction with Adaptive Bias Modulation 

Oct 1, 2005, By Tim Fergus

By combining the benefits of a linearizer with adaptive bias techniques, an amplifier’s efficiency can be significantly improved over a wide range of RF powers....

Software-defined radio: Integration for innovation 

Sep 1, 2005, By Darren McCarthy

Today's wireless industry is rapidly expanding with multiple standards and devices. New wireless technologies are being introduced at a progressively...

Software-defined radio poses major challenges for hardware and software developers 

Jun 1, 2005, By Steve Grossman, Contributing Editor

To fulfill the requirements of the Joint Tactical Radio System program, lowerdissipation FPGAs and more sophisticated DSPs must be developed to enable migrating software programmability closer to the antenna....

Increasing the speed of testing GSM/EDGE mobile phone power amplifiers 

May 1, 2005, By Roland Minihold, Rohde & Schwarz Munich, Germany

Testing is one of the critical operations necessary to ensure that GSM/EDGE mobile phones meet their required specifications. Consequently, reducing this...

Clever software strategies for solving high-level system solutions 

May 1, 2005, By Rodger H. Hosking

With time-to-market crunches, limited-development resources and no tolerance for trial and error, today's project managers are urgently seeking lower-risk strategies for embedded system development....

Cascaded transformers achieve better frequency performance in high-speed ADC 

Apr 1, 2005, By Rob Reeder

As higher frequency sampling becomes increasingly common, the front-end design of high-speed analog-to-digital converters (ADCs) has become a crucial...

New technology facilitates true software-defined radio 

Apr 1, 2005, By Ronald M. Hickling

While the article summarizes products available for software-radio application, it presents for the first time a carrier speed 5 GHz RF to a digital converter, which when coupled with state-of-the-art filtering software, can be used to meet the SDR Forum's definition of the ideal software radio....

CMOS extends its reach to millimeter waves 

Feb 1, 2005, Ashok Bindra, Editorial Director

Radio frequency (RF) ICs continue to benefit from advances in CMOS process technologies. Over the years, we have seen monolithic CMOS transceiver chips...

SDR platform enables reconfigurable direction finding system 

Jan 1, 2005, By Jyothsna Rajan

A software-defined radio (SDR) transceiver platform is used to implement a reconfigurable direction finding (DF) system. This article will describe the intended data flow and data rate requirements of a typical DF system, map the DF software components to the SDR platform, and demonstrate the availability of resources for more complex implementations....

Mathematical basics of bandlimited sampling and aliasing 

Jan 1, 2005, By Vladimir Vitchev

Modern applications often require that we sample analog signals, convert them to digital form, perform operations on them, and reconstruct them as analog signals. The important question is how to sample and reconstruct an analog signal while preserving the full information of the original....

Quantifying system performance of GSM/GPRS PAs with differing levels of integration 

Oct 1, 2004, By Mendy Ouzillou

The two key power amplifier metrics are power and efficiency. When comparing power amps with different levels of integration, the context of how the specifications are defined is important. The performance of the system solution is referenced to the antenna and battery, then distilled into one metric....

DSP brings base station SDR reality 

Sep 1, 2004, By Andy McCann and Brad Brannon

Developments in digital signal processing and data conversion are enabling the commercialization of software-based wideband receiver, thereby reducing the cost, size, complexity and power consumption of a base station. Moreover, with the emergence of powerful DSP processors, base stations can now support a multilingual variety of air/modulation schemes and protocols....

Understanding the sampling process 

Sep 1, 2004, By R. N. Mutagi

Sampling is the first step in the process of converting a continuous analog signal to a sequence of digital numbers. This article provides an insight into time and frequency domains of sampled signals. The concept of the spectral window, defined by the sampling process, helps understand digital signals and signal processing....

Rf Front-End Considerations for Sdr Ultra-Wideband Communications Systems 

Jul 1, 2004, By Stéphane Paquelet, Christophe Moy and Louis-Marie Aubert

Design an efficient RF front-end for a novel impulse radio signal transmission with a detection scheme of an ultra-wideband software-defined radio with high data rate demodulation structure....

The importance of Fast, Economical Testing for RFIC PAs, Mobile Phones 

Jun 1, 2004, By Robert Green and Jerry Janesch

Testing of RFIC power amplifier and mobile phone handsets are approaching 10 percent of per-unit cost. Minimizing test time by combining today’s intelligent instruments, manufacturers can significantly increase testing throughput, thus garnering a substantial competitive advantage....

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