Analog Dialogue, Volume 46, Number 4
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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 4, 2012
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 46, Number 4 - Analog Dialogue
ANALOG DIALOGUE
VOLUME 46, NUMBER 4
Charly El-Khoury
Alan Walsh
Brian Kennedy
John Kruse
Catherine Redmond
Sandro Herrera
Moshe Gerstenhaber
Tracey Johnson
Dan Sheingold, Editor
Scott Wayne, Editor
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Published by Analog Devices on Smashwords
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Analog Dialogue
Volume 46, Number 4
Copyright © 2012 by Analog Devices
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Smashwords Edition License Notes
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Table of Contents
Compensating Amplifiers That Are Stable at Gain ≥ 10 to Operate at Lower Gains
This article shows how compensating an amplifier that is normally stable with a gain higher than +9 to operate with a gain as low as +2 provides higher slew rate and faster settling time than an equivalent internally compensated amplifier. The two methods presented here trade complexity for total wideband noise. The ADA4895-2 dual high-speed, low-power operational amplifier is used as an example.
Front-End Amplifier and RC Filter Design for a Precision SAR Analog-to-Digital Converter
Successive-approximation ADCs offer high resolution, excellent accuracy, and low power consumption. Once a particular precision ADC has been chosen, system designers must determine the support circuitry needed to obtain the best results. The three principal areas to consider are the front end, the voltage reference, and the digital interface. This article focuses on the front end.
Implementing an Isolated Half-Bridge Gate Driver
Many applications, ranging from isolated dc-to-dc power supplies to solar inverters, use isolated half-bridge gate drivers to control large amounts of power with high efficiency, power density, isolation voltage, and long-term reliability. This article discusses details of these design concepts to illustrate the ability of isolated half-bridge gate driver ICs to provide high performance in a small package.
Detecting and Distinguishing Cardiac Pacing Artifacts
When heart patients undergo ECG testing, the cardiologist must be able to detect the presence and effects of a pacemaker. The electrical signature of the pacing signal consists of small, narrow pulses. Buried in noise and larger cardiac signals, these artifacts can be difficult to detect. This article describes the nature of pacing artifacts and introduces a device and method for detecting them.
Versatile, Low-Power, Precision Single-Ended-to-Differential Converter
Many applications, including driving modern ADCs, transmitting signals over twisted-pair cables, and conditioning high-fidelity audio signals, require differential signaling, which achieves higher signal-to-noise ratios, increased common-mode noise immunity, and lower second-harmonic distortion. This article offers a circuit block that can convert single-ended signals to differential signals.
HART Communication Networks Are Improved by Small, Flexible, Low-Power Modem ICs
Measurement, control, and communication with instrumentation systems employing sensors and actuators is the backbone of modern manufacturing plants. Communication employing 4-mA-to-20-mA analog signals has long been in widespread use, but instrumentation has matured from those purely analog systems to today's smart systems that use the HART protocol to enable two-way digital data.
Compensating Amplifiers That Are Stable at Gain ≥ 10 to Operate at Lower Gains
By Charly El-Khoury
This article shows how compensating an amplifier—such as the ADA4895-2, which is normally stable for a gain higher than +9—to operate with a gain as low as +2 provides higher slew rate and faster settling time than an equivalent internally compensated amplifier. Two methods will be presented, and advantages and disadvantages of each circuit will be highlighted.
The ADA4895-2, a device in the same family as the ADA4896-2, ADA4897-1, and ADA4897-2, is a dual low-noise, high-speed, voltage-feedback amplifier with rail-to-rail outputs. Stable with a minimum gain of 10, it features 1.5-GHz gain-bandwidth product, 940-V/µs slew rate, 26-ns settling time to 0.1%, 2-nV/√Hz 1/f noise at 10 Hz, 1-nV/√Hz wide band noise, and