4-A Chips Charge Smart-Phone Li-Ion Batteries
MD&D News Staff
Trumpeted as the first monolithic, 4-A Li-ion battery charger ICs, Summit Microelectronics’ configurable SMB349 and SMB359 operate from a 3.6-V to 16-V input range...
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So, Who Needs ZigBee?
We're beginning to hear more and more about this wireless technology called ZigBee. We already have Bluetooth- and Wi-Fi-enabled devices, and WiMAX and Wireless USB proliferation are at the doorstep. Who needs another wireless standard?...
Phase-Noise Profiles Aid System Testing
Engineers normally try to minimize phase noise, but for test purposes, they sometimes worsen the phase noise intentionally. The deliberate introduction of phase noise aids in testing a system's tolerance for phase noise or jitter....
Changes in Base Station Backhaul Drive New Sync Solutions
As more mobile network operators deploy high-speed data services using IP backhaul, the need for stable and accurate frequency reference becomes more critical. This need is particularly apparent for applications such as successful hand-offs between base stations and the transport of real-time services....
The challenges of testing MIMO
This article focuses on demystifying physical layer issues with multiple input multiple output (MIMO) technology, and presents ways of improving MIMO performance....
OFDM or OFDMA?
IEEE 802.16d (fixed service) uses Orthogonal Frequency Division Multiplexing (OFDM). IEEE 802.16e (mobile) uses Orthogonal Frequency Division Multiple Access (OFDMA). So, what’s the difference between the two, and why is there a difference?...
DualPath Architecture Blends Optical Wireless and RF Into High Bandwidth, High Availability Outdoor Point-to-Point Solutions
Today, the use of wireless technologies for connecting buildings, campuses and remote locations rapidly and cost-effectively has become commonplace on a global scale. ...
A general measurement technique for determining RF immunity
This article describes a generalized technique to measure the RF immunity of a circuit. It defines a standard and structured test methodology aimed at establishing adequate repeatability of the test results for qualitative analysis....
Improving amplifier's efficiency using a Linearizer in Conjunction with Adaptive Bias Modulation
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....
AC parameters as they affect LDO performance in RF devices
Many AC parameters affect RF system performance including transient response, power supply ripple rejection and self noise. Power supply ripple rejection,...
RF MEMS in mobile phones
The need for multiband, multimode band switching at low insertion loss while maintaining excellent linearity in mobile phones is driving the need for RF MEMS-based switches. Since this switching problem gets even more acute as new complex waveforms, such as WiMAX are added to this mix, this article looks at the current state of development in RF MEMS switches and discusses its impact on 3G cellular phones....
Single-chip, multimode WEDGE RF transceiver for 3G handsets
Sequoia Communications has combined its polar architecture with 0.18 micron silicon germanium (SiGe) biCMOS process technology to create what it claims is the first true multimode transceiver using a common basic architecture across all modes....
Is UWB moving toward standardization?
Despite hurdles, the ultra-wideband UWB standardization process continues with supporters from both factions Multiband OFDM Alliance MBOA...
Digital step attenuators offer precision and linearity
Super RF CMOS process technology has been used to develop digital step attenuators that offer an unprecedented combination of accuracy, linearity, programmability, ESD tolerance and wide bandwidth in a miniature surface-mount package....
Security Considerations for WiMAX-based Converged Network
With WiMAX promising to solve the bandwidth bottleneck, many carriers are looking to networking OEMs to provide robust security solutions - particularly VPNs and firewalls - in their edge devices, allowing them to securely deliver feature-rich services to subscribers, while protecting their own networks. Software original design manufacturers are now entering the fray to ensure that device vendors can provide carriers with these next-generation converged platforms, while adhering to the strict certification processes and rigid standards of quality in shorter development cycles....
Low-power receiver architecture for interference-robust UWB radio
Ultra-wideband (UWB) wireless communication promises unprecedented levels of seamless connectivity between consumer electronics devices, enabling gigabytes of data to be transmitted in seconds rather than hours without exhausting the batteries of hand-held devices. To meet the low-cost requirement of consumer product applications, the multiband-orthogonal frequency-division multiplexing system has been designed to minimize transceiver architecture complexity....
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