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... |
Reflections on Transistor Stability
When designing amplifiers, one goal is to get rid of any oscillations. The standard approach is to examine the so-called K-factor, or stability circles on the Smith chart. However, there are limitations to this approach. This paper examines those limitations and presents a new methodology to reduce oscillations by employing a complex sphere....
Serving the new DoD cheaper, faster, stronger
As the telecommunications industry comes to grips with standards issues, debt loads larger than some countries' GNP, and dozens of unanswered technical questions, the microwave industry is looking for ways to replace its lost wireless revenue. Ironically, this new business may well come from the same source that was lost in 1990 when microwave companies rode off into the wireless revolution: the defense industry. The microwave manufacturers that plan to prosper in this new military environment m...
Correlating High-Speed ADC Performance to Multicarrier 3G Requirements
The sensitivity analysis of multicarrier 3G receivers depends on various aspects of the system design goals. While linear devices have well known system contributions, data converters contribution to system performance is less well understood. This article will provide guidelines for analog-to-digital converter (ADC) selection based on receiver performance requirements....
Designing Signals for Arbitrary Waveform Generators
Many modern RF signal generators are equipped with a baseband signal processing board that includes a dual arbitrary waveform generator, which is used to drive an IQ modulator. These signal generators typically support a wide variety of modulation schemes implemented either as part of their firmware personalities or via dedicated external software packages. An alternative to instrument specific multitone, modulated pulsed signals is to design the waveform in customized software....
RF Module Design: Requirements and Issues
At the hub of a top-down design flow for an RF-system-design-to-product implementation is the RF module design for RF integrated circuits (RFICs), boards and a final RF system prototype. A lack of EDA tool integration and/or standard data-interfaces for the various design disciplines — such as the RF system, printed circuit boards (PCBs), IC packages and IC designs, and prototype testing — have contributed to the difficulty of achieving more accurate models. This article will highlig...
products
Low-noise amplifier ICs for broadband millimeter wave communications TriQuint Semiconductor Inc. announced the introduction of three new low-noise amplifier...
PSCPS Family of Coplaner Analog Phase Shifters
Agile Materials & Technologies Inc. announced its PSCPS family of coplanar analog phase shifters. These products are the first in a series that enable...
product focus test and measurement
Anritsu Co. Measurement Solution for Handset Power Amplifiers Anritsu Co. Corp. introduced the ME7840/4 handset power amplifier test system (PATS), a...
RF Fundamentals
As I am sure some of you have noticed, there have been a few changes on the editorial staff of RF Design in the last few months. I am the latest addition...
The 4G soldier new developments in military mobile communications
The key to empowering the military with tactical broadband voice, video and data is 4G communications technology that requires a minimal amount of fixed infrastructure, is small and highly portable, and inexpensive enough to be standard issue for every soldier....
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....
products
Short Range Unidirectional Radio Frequency System Microchip Technology Inc. introduced a complete system for short-range uni-directional RF communications....
MMDS, Wireless Broadband Access and the Last Mile
Two-way multichannel, multipoint distribution service (MMDS) is a cost-effective, wireless alternative to digital subscriber lines (DSL) and cable modem...
A Low Noise, Multiple Output PLL Synthesizer for Radar Applications
Advanced radar applications require highly stable frequency references with extremely low phase noise floor performance. Generally the frequency of references...
Techniques for Determining Small Antenna Gain
In miniature receiver design, such as keyless entry and security devices, one challenging task is optimizing all circuits affecting radiated sensitivity....
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