Powering Portable Devices
Current
Figure 1: Transmission period of a typical GSM/GPRS pulse
With USB being a standard interface in PC peripherals, the number of applications that can be powered from a USB port is increasing at an exponential rate. The need for flexibility and continuous connectivity in our lives is becoming more important than ever before. In a growing wireless world, many
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Date:
1/1/2012
Figure 1: Typical switch-mode battery charging IC
This article discusses the selection process for deciding the battery charging topology in portable, consumer applications. The article analyzes system and battery conditions under which the benefits of specific solutions outweigh the benefits of others. The analysis focuses on technical issues,
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Date:
1/1/2012
Figure 1: Application circuit for battery to battery charge transfer
These days, people can’t live without cell phones. This is not a monumental revelation to anyone who has been at an airport, a shopping mall, or a park watching their children play. We close business deals, talk to our friends and family, check email, and browse the web while waiting for a connecting
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Date:
1/1/2012
Figure 1: A traditional passive internal antenna covers the mobile TV bandwidth with very high VSWR (left) whereas a narrow tunable antenna can be moved in frequency to cover the same bandwidth with significantly better VSWR (right).
Thinner form factors, mobile TV and the requirement for power efficiency are placing extreme demands on the antenna, requiring a new approach to keep calls on track and antennas inside the handset.
Footprints are shrinking inside wireless and mobile devices, making a significant impact on
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Date:
1/1/2012
Figure 1: Process geometry trend for NAND flash memory technology
The handset world is seeing a burgeoning need for memory storage. This article discusses memory trends and different methods of powering SD Flash memory.
The need for memory is being driven by rapid advancements in the ability to capture, display, and share both video and image content.
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Date:
1/1/2012
Figure 1: Typical offset after calibration using standard offset calibration method
Lithium Ion batteries are becoming the technology of choice for most portable applications requiring rechargeable batteries. The advantages include high energy density per volume and weight, high voltage, low self-discharge, and no memory effect.
When selecting a lithium Ion battery, it is
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Date:
1/1/2012