Analog Dialogue, Volume 48, Number 2
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Analog Dialogue -- A Forum for the Exchange of Circuits, Systems, and Software for Real-World Signal Processing Analog Dialogue is the technical magazine of Analog Devices. It discusses products, applications, technology, and techniques for analog, digital and mixed-signal processing. This is Volume 48, Number 2, 2014
Analog Dialogue
Analog Dialogue, www.analog.com/analogdialogue, the technical magazine of Analog Devices, discusses products, applications, technology, and techniques for analog, digital, and mixed-signal processing. Published continuously for 45 years—starting in 1967—it is available in two versions. Monthly editions offer technical articles; timely information including recent application notes, new-product briefs, pre-release products, webinars and tutorials, and published articles; and potpourri, a universe of links to important and relevant information on the Analog Devices website, www.analog.com. Printable quarterly issues and ebook versions feature collections of monthly articles. For history buffs, the Analog Dialogue archive, www.analog.com/library/analogdialogue/archives.html, includes all regular editions, starting with Volume 1, Number 1 (1967), and three special anniversary issues. To subscribe, please go to www.analog.com/library/analogdialogue/subscribe.html. Your comments are always welcome: Facebook: www.facebook.com/analogdialogue; Analog Diablog: analogdiablog.blogspot.com; Email: dialogue.editor@analog.com or Scott Wayne, Publisher and Editor [scott.wayne@analog.com].
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Analog Dialogue, Volume 48, Number 2 - Analog Dialogue
ANALOG DIALOGUE
VOLUME 48, NUMBER 2
Mark Looney
Jess Espiritu
Mark Reisiger
Irvin Ou
Jim Scarlett
James Bryant
Scott Wayne, Editor
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Published by Analog Devices on Smashwords
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Analog Dialogue
Volume 48, Number 2
Copyright © 2014 by Analog Devices
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Smashwords Edition License Notes
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Table of Contents
An Introduction to MEMS Vibration Monitoring
Inertial MEMS sensors play a significant role in the massive expansion of today’s personal electronic devices. Their small size, low power, ease of integration, high level of functionality, and superb performance encourage and enable innovation in gadgets such as smartphones, gaming controllers, activity trackers, and digital picture frames; and their high reliability and reduced cost allows them to be deployed in most automotive safety systems.
Capacitance-to-Digital Converter Facilitates Level Sensing in Diagnostic Systems
In blood analyzers, in-vitro diagnostic systems, and other chemical analysis applications, fluids must be moved between vessels to aspirate samples from cuvettes or reagents from bottles. These lab-based systems frequently handle numerous samples, so minimizing processing time is essential. This article demonstrates a novel use of CDCs to sense fluid levels with a high degree of confidence.
Simple Circuit Allows Backward Compatibility for Digital Power Controllers
Digital power control enables system configuration through the power management bus. Its advanced control algorithms improve performance, and its programmability allows application optimization. As digital power management replaces many analog controllers, it must maintain backward compatibility so that both digital power modules and analog power modules can operate in the same system.
Creative Compensation Enables Tiny Amplifier to Drive 200-mW Loads
Some amplifiers must deliver a moderate amount of power to a load while maintaining dc accuracy. A precision op amp can drive loads requiring less than 50 mW, and a compound amplifier can drive loads requiring watts, but no good solution exists in the middle of the range. Either the op amp can’t drive the load, or the circuit becomes large, complex, and expensive.
Complex Power-Supply Sequencing Made Easy
Power-supply sequencing is required for microcontrollers, FPGAs, DSPs, ADCs, and other devices that operate from multiple voltage rails. This article discusses the advantages and disadvantages of using discrete components to sequence the power supplies, and describes a simple, yet effective, method of achieving sequencing by using the internal precision enable pins of the ADP5134.
Current-Output Circuit Techniques Add Versatility to Your Analog Toolbox
Current mirrors and current sources offer advantages in a number of situations, including analog current-loop signaling in high-noise environments and level shifting an analog signal across a large potential difference without the use of optical or magnetic isolation techniques. This article summarizes some of the techniques available and suggests a number of useful circuits.
An Introduction to MEMS Vibration Monitoring
By Mark Looney
Introduction
Inertial MEMS sensors play a significant role in the massive expansion of today’s personal electronic devices. Their small size, low power, ease of integration, high level of functionality, and superb performance encourage and enable innovation in gadgets such as smartphones, gaming controllers, activity trackers, and digital picture frames. In addition, inertial MEMS sensors have substantially improved reliability and reduced cost in automotive safety