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Volume 50 — May 2016

Timely Information

Application Notes

Circuits from the Lab

New Product Briefs

Rarely Asked Questions

Technical Articles

Webcasts

  

Products

Amplifiers

Analog-to-Digital Converters

Application Specific

Audio and Video Products

Broadband

Clock and Timing

Digital-to-Analog Converters

Interface and Isolation

Linear Products

MEMS

Optical

Power Management

Processors and DSP

RF and Microwave

Sensors

Switches and Multiplexers

  

Analog Dialogue--Since 1967

Feature Articles: Products, Applications, Technology, Design Ideas, Tutorials, and Measurement Techniques

 

A Note from the Editor

 

Interleave

Op Amp Input Overvoltage Protection: Clamping vs. Integrated

In some applications, a situation may occur in which the inputs of an op amp get driven by voltages that exceed the level of the supply voltages—this is called an overvoltage condition. Overvoltage can result in certain aspects of the op amp’s electrical performance being shifted beyond its data sheet guaranteed limits; it can even cause permanent failure of the device. The challenge then is to add overvoltage protection (OVP) circuitry at the input of the op amp without adding errors that result in a loss of system precision. This article compares and contrasts two approaches to input overvoltage protection.

Designing for Low Noise Feedback Control with MEMS Gyroscopes

Noise in the output angular rate signals of a MEMS gyroscope, can have a direct influence over critical system behaviors, such as platform stability, and is often the defining factor in the level of precision that a control system can support. Understanding the motion-control system’s dependence on gyroscope noise behaviors has a number of rewards for the designer, such as being able to establish relevant requirements for the feedback sensing element or, conversely, analyzing the system-level response to noise in a particular gyroscope. This article focuses on developing the most appropriate criteria for MEMS gyroscope selection and considerations for preserving the available noise performance throughout the sensor’s integration process.

Who ate my dBs?

I am setting my signal generator to output a CW tone at a certain power, which per my math, should give a -1 dBFS signal at the ADC. However, I am seeing -15 dBFS! Who ate all of my dBs?

 

Interleave

Replacing Discrete Protection Components with Overvoltage Fault Protected Analog Switches

The challenge of designing robust electronic circuitry often results in a design with a multitude of discrete protection components with associated cost, design time, and space additions. This article examines a fault protected switch architecture, along with the performance benefits and other advantages it offers vs. traditional discrete pro¬tection solutions. This new architecture is fabricated on a proprietary high voltage process that insures a new level of fault protection while meeting the performance requirements of precision signal chains.

Practical Filter Design Challenges

Precision analog-to-digital converters are popularly used in many applications, such as instrumentation and measurement, PLM, process control, and motor control. Current SAR ADCs go up to 18-bit or even higher resolution at x-MSPS, while Σ-Δ ADCs can be 24- or 32-bit resolution at hundreds of kSPS. It is critical that users limit their signal chain noise in order to achieve the rated performance of these high-performance, high-resolution, converters. This article discusses the design challenges and considerations associated with implementing the analog and digital signal chain filters necessary in managing signal noise.

murphy

Citius, Altius, Fortius (Faster, Higher, and Stronger)

The data sheet for the amplifier that I've chosen for my application specifies a small signal bandwidth along with a large signal bandwidth, and they are quite different specs. How do I determine if my signal qualifies as small or large?

...Recent Articles

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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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