Thursday, July 24, 2008

Volume 42, Number 2, 2008 Print Edition

In this issue:

2 -- Editors’ Notes
3 -- Noise Figure and Logarithmic Amplifiers [The Wit and Wisdom of Dr. Leif—6]
9 -- Understanding Hot Swap: Example of Hot-Swap Circuit Design Process
14 -- Discrete- and Integrated Control of Power Amplifiers in Base Stations
17 -- Product Introductions
18 --From the Back Burner

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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.

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.