Batteries/Power Management
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Multihoming support for data communication over cellular networks
A guide to interfacing an embedded system's application software with a second generation wireless communications protocol stack and how to configure and manage multi-homing support over GPRS modems using unreliable wireless channels.
Increase the speed while reducing the power in your MID's display
The popularity of Mobile Internet Devices (MIDs) will surely rise as the user experience improves.
Getting the most battery life from portable systems
Run time of portable systems is increasingly important as devices
become more feature-rich with power-hungry processors, transmitters,
receivers, and media playback, to name just a few. Using a battery
"fuel gauge" is the natural step to increasing run time of the system.
Comparison of xenon flash and high current LEDs for photo flash in camera phones; a review and update
This article provides new information updating an Oct 2006 study comparing light sources for camera phones. This new report includes data captured from higher resolution, 5-megapixel camera phones released in the last year, and also considers the technology advancements in camera sensors, xenon flash units, high power WLEDs and LED flash drivers.
Video: B'com, Toshiba win sockets in iPhone 3GS
Teardowns of the third generation Apple iPhone reveal a more integrated—and probably lower cost--handset thanks in part to new design wins for Broadcom and Toshiba that caused one analyst to quip the 'S' in the iPhone 3GS may stand for savings.
Extend Battery Life in Mobile Applications using Innovative Audio Headphone Amplifiers
This article weighs headphone amplifier architectures, explains their pros and cons, and introduces a novel solution that solves issues created by some headphone amplifier architectures.
Power detection and control for mobile handsets
A key requirement within the modern mobile-handset power amplifier (PA) is a need to detect and control the transmitted power. This three-part article first explores the various methods of power control for amplifiers operating in both saturated and linear modes. The discussion continues with power detection techniques used in modern handsets. Topics include current, voltage, diode, power, logarithmic (log), and RMS detection, including performance characteristics such as RF bandwidth, video bandwidth, dynamic range, temperature compensation, and VSWR insensitivity.
A Global Approach to Lower Energy and Higher Efficiency in Embedded Systems
VirtualMetrix has developed a new software technology to manage all performance resources of a processorbased system with the goal of minimizing the energy consumption, increasing the processor efficiency and providing performance isolation to enable a higher degree of hardware convergence while reducing software development costs. The performance management software was combined with OK Labs' OKL4 virtualization Microkernel to create a complete software platform for embedded systems, including a development toolkit. Linux, Android and other Operating Systems will also be supported. While Performance Management can be useful in many applications, it is particularly beneficial in handsets where battery technology has reached its limits while designers continue to pack more and more functionality to narrow the gap to mobile computers.
MORE DESIGN CENTER
«March 2010 Batteries/Power Management
About the Mobile Handset Batteries/Power Management How-To Section
Mobile Handset DesignLine's Batteries/Power Management section is the design resource for engineers looking to implement battery, power supply and power management subsystems in mobile handsets.
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