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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 — August 2008 Impedance Measurement Monitors Blood Coagulation Blood coagulation is a complex process by which clots are formed to end bleeding at an injured site. During heart-bypass surgery, blood is diverted to a heart-lung machine. An anticoagulant is administered during surgery—followed by a rapid reversal. This article describes a coagulation monitor that provides rapid, automated data—aiding patient safety, workflow, and decision making—and leading to improved outcomes. 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. Copyright 1995- Analog Devices, Inc. All rights reserved. ISSN 1552-3284 |
The Back Burner Linear Variable Differential Transformers The linear variable differential transformer is an accurate and reliable method for measuring linear distance. LVDTs are position-to-electrical sensors whose output is proportional to the position of a movable magnetic core, which moves linearly inside a transformer. LVDTs find uses in machine-tools, robotics, avionics, and computerized manufacturing. 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. |
