Incremental Improvements Define The 2012 Mobile World Congress |
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Louis E. Frenzel, Editor in Chief
The usual players all showed up at this year’s Mobile World Congress in Barcelona with lots of improved devices, but no real game-changing breakthroughs... |
Changing designs, changing perceptions
RF Design has received a few inquiries from people questioning the upcoming changes to the magazine starting in the September issue. Some readers are...
Harmonics and double side bands
I've received many responses to my first RF Fundamentals column. There were two messages I overwhelmingly received. First, many people wrote that this...
Microwave chirp radar design: combining virtual and physical hardware performance analysis
[For a copy of this article in PDF format, which displays figures and equations, click here. Requires Adobe Acrobat Reader, free download.] Aerospace/Defense...
High-temperature superconductor filter technology breaks new ground
Successive generations of wireless systems based on HTS technology continue to offer increasing performance, high reliability and continued tailoring to the specific needs of today's wireless networks. Thousands of HTS systems are deployed today in wireless networks and the rate of adoption of the technology continues to grow....
Why oscillators are the best frequency sources for wireless designs
[For a copy of this article in PDF format, which displays figures and equations, click here. Requires Adobe Acrobat Reader, free download.] The rapid...
Gain and frequency stabilization in polyphase filters with low open-loop gain operational amplifiers
Replacing two separate post-mixer filters with a single polyphase filter1 has several advantages...
Analysis and implementation of carrier recovery process in a multimission remote sensing satellite ground station
Remote sensing satellites transmit digitally modulated signals of different data rates in different PSK modulation schemes. The ground stations meant for receiving these signals are designed with the feed and front-end system broad enough to accommodate the reception of signals anywhere in the assigned spectrum. Various carrier regeneration schemes have been developed and implemented in this multimission demodulator design for optimal performance in different applications. This article briefly d...
Digitally controlled, variable-gain amplifier
Maxim Integrated Products Inc. introduced the MAX2055, which the company says is the industry's first high-performance, digitally controlled, variable-gain,...
product focus Tx/Rx
Ceramic 2 way power splitter Mini-Circuits Inc. introduced its new SCN series of ceramic 2 way-degree power splitters. The devices operate in the 800...
products
AMPLIFIERS A 4 Watt, 30 GHz packaged amplifier TriQuint Semiconductor Inc. introduced the TGA4905, a 4 W packaged transmit amplifier for satellite ground...
Geometric programming-based design
Geometric programming (GP) based design is a novel approach for quickly creating optimal analog and RF circuits and subsystems according to detailed application specifications. This article looks at standard methods used in today's integrated circuit (IC) design and compares them to the GP-based design approach....
Let's face it, it's time for a face lift
Change is inevitable. People change, product designs change, even entire markets change. The wireless device markets are in the midst of changing from...
Multichannel, multiband VHF software radio based receiver eliminates RF down conversion
The advent of software defined radio (SDR) has promised great hope for radio communications by offering ease of design and flexibility not previously possible. The push is to place the analog to digital converter (ADC) as close as possible to the antenna, thereby performing a variety of receive functionalities in the digital domain. This ensures ease of design and flexibility....
Managing noise and spurious within complex microwave assemblies
RF engineers designing complex converter and frequency synthesizer subsystems must analyze each noise and spurious contributor separately to gain confidence in proposed designs. goal of this article is to systematically address some of the subtle effects that engineers spend so much time chasing....
Ultrawideband: New promises, new problems
Ultrawideband (UWB) uses low-power transmission of a high-speed pulsed radio signal to send information through the air over short distances. The pulses are very short or narrow, resulting in a wide transmission bandwidth. UWB technology may lead to advances in safety and rescue operations, military applications, medical imaging, and enable broadband communications to devices in homes and offices....
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