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    Analog Dialogue Volume 46, Number 1: Analog Dialogue, #5
    Analog Dialogue Volume 46, Number 1: Analog Dialogue, #5
    Analog Dialogue Volume 46, Number 1: Analog Dialogue, #5
    Ebook104 pages46 minutes

    Analog Dialogue Volume 46, Number 1: Analog Dialogue, #5

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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 46, Number 1, 2012

    LanguageEnglish
    PublisherAnalog Dialogue
    Release dateAug 30, 2012
    ISBN9780916550356
    Analog Dialogue Volume 46, Number 1: Analog Dialogue, #5
    Author

    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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      Book preview

      Analog Dialogue Volume 46, Number 1 - Analog Dialogue

      ANALOG DIALOGUE

      VOLUME 46, NUMBER 1

      Brendan Cronin

      Eric Modica

      Michael Arkin

      Padraic O’Reilly

      Charly El-Khoury

      David Brandon

      Jeff Keip

      Luis Orozco

      Nathan Carter

      Chilann Chan

      Dan Sheingold, Editor

      Scott Wayne, Editor

      * * * * *

      Published by Analog Devices on Smashwords

      * * * * *

      Analog Dialogue

      Volume 46, Number 1

      Copyright © 2012 by Analog Devices

      * * * * *

      Smashwords Edition License Notes

      Thank you for downloading this free ebook. You are welcome to share it with your friends. This book may be reproduced, copied, and distributed for non-commercial purposes, provided the book remains in its complete original form. If you enjoyed this book, please return to Smashwords.com to discover other works by this author. Thank you for your support.

      Table of Contents

      Robust Amplifiers Provide Integrated Overvoltage Protection

      Faulty performance or damage can occur when an op amp’s input voltage exceeds the specified input-voltage range. This article discusses some common causes and effects of overvoltage conditions, how cumbersome overvoltage protection can be added to an unprotected amplifier, and how the integrated overvoltage protection of newer amplifiers provides a compact, robust, cost-effective solution.

      Modern DACs and DAC Buffers Improve System Performance, Simplify Design

      As the heart of many instrumentation and control systems, digital-to-analog converters (DACs) play a key role in determining system performance and accuracy. This article looks at a new precision, fast-settling, voltage-output 16-bit DAC and shows some ideas for buffering the outputs of high-speed complementary current-output DACs that can rival transformer performance.

      DDS Devices Generate High-Purity Waveforms Simply, Efficiently, and Flexibly

      Direct digital synthesis (DDS) technology is used to generate and modify high-quality waveforms in a broad range of applications in such diverse fields as communications, defense, medicine, industry, and instrumentation. This article provides an overview of the technology, describes its strengths and limitations, looks at some application examples, and showcases some significant new products.

      Efficient FSK/PSK Modulator Uses Multichannel DDS to Switch at Zero Crossings

      This article describes how two synchronized DDS channels can implement a zero-crossing FSK or PSK modulator. In phase-coherent radar systems, zero-crossing switching reduces the amount of post processing needed for target signature recognition; and zero-crossing switching reduces PSK spectral splatter. Here, the AD9958 two-channel complete DDS is used to switch at the zero crossing.

      Low-Noise, Gain-Selectable Amplifier

      Traditional gain-selectable amplifiers use switches in the feedback loop to connect resistors to an amplifier, but the switch resistance degrades the noise performance of the amplifier, adds significant capacitance on the inverting input, and contributes to nonlinear gain error. This article presents a gain-selectable amp that uses an innovative switching technique that preserves the noise performance while reducing the nonlinear gain error.

      Designing a Low-Power Toxic Gas Detector

      Safety first! Many industrial processes involve toxic compounds, including chlorine, phosphine, arsine, and hydrogen cyanide, so it is important to know when dangerous concentrations exist. This article describes a portable carbon monoxide detector using an electrochemical sensor. CO is relatively safe to handle, but it is still lethal, so use extreme care and appropriate ventilation when testing the circuit described here.

      Robust Amplifiers Provide Integrated Overvoltage Protection

      By Eric Modica and Michael Arkin

      Faulty performance, or even damage, can occur when an op amp’s input voltage exceeds the specified input-voltage range, or—in extreme cases—the amplifier’s supply voltage. This article discusses some common causes and effects of overvoltage conditions, how cumbersome overvoltage protection can be added to an unprotected amplifier, and how the integrated overvoltage protection of newer amplifiers provides designers with a compact, robust, transparent, cost-effective solution.

      All electronic components have upper limits to the applied voltages they can tolerate. When any of these upper limits are exceeded, the effects can range from momentary interruption of operation to system latch-up to permanent damage. The amount of overvoltage a given component can tolerate depends on several factors, including whether the part is installed or incidentally contacted, the amplitude and duration of the overvoltage event, and the robustness of the device.

      Precision amplifiers, often the first component in sensor measurement signal chains, are the most exposed to overvoltage faults. When selecting a precision amplifier, system designers must be aware

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