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Volume 48 December 2014

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Application Notes

Circuits from the Lab

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Analog Dialogue--Since 1967

Feature Articles: Products, Applications, Technology, and Techniques

Wearable Electronic Devices Monitor Vital Signs, Activity Level, and More

Wearable devices for vital-sign monitoring are transforming the healthcare industry, allowing us to monitor our vital signs and activity anytime, anywhere. To be effective, wearable devices must be small, low cost, and low power. This two-part article describes some low-power products for wearable and personal health applications, in this fast growing, exciting, rapidly changing market.

Synchronous Detectors Facilitate Precision, Low-Level Measurements

Synchronous detectors can extract small signals, buried in the noise, to measure properties such as very small resistance, light absorption or reflection against bright backgrounds, or strain accompanied by high noise levels. The noise often increases as the frequency nears zero. Moving the measurement away from the low-frequency noise increases the SNR, allowing weaker signals to be detected.

...Recent Feature Articles: Products, Applications, Technology, and Techniques

Feature Articles: Design Ideas, Tutorials, Measurement Techniques

Understand Low-Dropout Regulator (LDO) Concepts to Achieve Optimal Designs

This brief tutorial introduces some common terms used with LDOs, explaining fundamental concepts such as dropout voltage, headroom voltage, quiescent current, ground current, shutdown current, efficiency, dc line-and-load regulation, transient line-and-load response, power-supply rejection ratio (PSRR), output noise, and accuracy, and accuracy, using examples and plots.

ADC Modeling Tools Speed Up Evaluation

System designers are faced with a common dilemma: design a new product on a known platform, making only minor changes; or use a brand-new platform with the most advanced products and capabilities. A new suite of simulation tools now enables quick prototyping in software, minimizing development risk, providing confidence that products will work as expected, and delaying hardware decisions to save time and money.

...Recent Feature Articles: Design Ideas, Tutorials, and Measurement Techniques

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Analog Dialogue is the technical magazine of Analog Devices. It discusses products, applications, technology, and techniques for analog, digital and mixed-signal processing.

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