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Timely Information Recently released products, normally available from stock. These front-line products are on their way to being fully released. Links to all sorts of "good stuff": Articles, Data Sheets, Patents... The latest from our apps engineers
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Current Feature Articles Volume 42 — July 2008 Fingerprint Sensor and Blackfin Processor Enhance Biometric Identification The need for effective, efficient security is manifest in today’s world. Individuals must be identified to allow or prohibit access to secure areas—or to enable them to use a computer. Biometric signatures identify individuals by measuring unique physical and behavioral characteristics using: a sensor, feature extraction, pattern matching, and decision making—allowing a user’s claimed identity to be authenticated or rejected. Noise Figure and
Logarithmic Amplifiers [The Wit and Wisdom of Dr. Leif—6] Log amps are uniquely equipped as RF measurement elements at frequencies from near-dc up to 12 GHz because of their wide dynamic range, temperature stability, excellent log conformance, and ease of use—with measurements provided directly in decibels. Noise figure is a valuable metric when log amps are used in the signal path, as it indicates the system's ability to extract information in the presence of noise. Understanding Hot-Swap Controllers: Hot-Swap Circuit Design Example High-availability systems, such as servers, network switches, redundant-array-of-independent-disk (RAID) storage, and other forms of communications infrastructure must be designed for near-zero downtime throughout their useful life. Components that fail or need updating must be replaced without interrupting the rest of the system. This process, known as hot-swapping or hot-plugging, requires a hot-swap controller. Copyright 1995- Analog Devices, Inc. All rights reserved. ISSN 1552-3284 |
The Back Burner Open-Loop Calibration Techniques for Digital-to-Analog Converters In principle, you give a digital input to a DAC and it provides an accurate output. In reality, the accuracy of the output voltage is subject to gain and offset errors from the DAC and other components in the signal chain. The system designer must compensate for these errors in order to get an accurate output voltage. AC Shield Enhances Remote Capacitive Sensing The principle of a user touch causing a capacitance change to activate a switch is well understood, but implementing a PCB sensor design with proper shielding and routing poses a challenge. Analog Devices provide a complete capacitive-sensing solution, including controller, evaluation tools, sensor design libraries, and software for the host microcontroller. |
