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Volume 49 January 2015

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Analog Dialogue--Since 1967

Feature Articles: Products, Applications, Technology, and Techniques

Power Management for Integrated RF ICs

As more building blocks are added to a radio-frequency integrated circuit, more sources of noise coupling arise, making power management increasingly important. This article describes how power-supply noise can affect the performance of RFICs. The ADRF6820 quadrature demodulator with integrated phase-locked loop and voltage-controlled oscillator is used as an example, but the results are broadly applicable to other high-performance RFICs.

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.

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

Feature Articles: Design Ideas, Tutorials, Measurement Techniques

Design Reliable Digital Interfaces for Successive-Approximation ADCs

SAR ADCs provide up to 18-bit resolution at up to 5 MSPS. A host processor can access the ADC via a variety of serial and parallel interfaces such as SPI, I2C, and LVDS. This article discusses design techniques for reliable, integrated digital interfaces, including the digital power-supply level and sequence, I/O state during turn on, interface timing, signal quality, and errors caused by digital activity.

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, using examples and plots.

...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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