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Volume 48 April 2014

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Analog Dialogue--Since 1967

Feature Articles: Products, Applications, Technology, and Techniques

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.

Precision Resolver-to-Digital Converter Measures Angular Position and Velocity

Resolvers use the magnetic coupling between primary and secondary windings to measure the precise angular position of a rotating element. Used in industrial motor controls, servos, robotics, power train units in hybrid- and full-electric vehicles, and many other applications, resolvers can withstand severe conditions, making them the perfect choice for military systems in harsh environments.

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

Feature Articles: Design Ideas, Tutorials, Measurement Techniques

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.

Noise-Reduction Network for Adjustable-Output Low-Dropout Regulators

Noise is extremely important to designers of high-performance analog circuits, especially high-speed clocks, ADCs, DACs, VCOs, and PLLs. A key to reducing noise is keeping the noise gain of the low-dropout regulator (LDO) that drives the circuit close to unity without compromising ac performance or dc gain. A simple RC network can reduce the output noise of an adjustable-output LDO.

...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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