from the Lab
and Video Products
Feature Articles: Products, Applications, Technology, Design Ideas, Tutorials, and Measurement Techniques
A Note from the Editor
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?
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
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.
Citius, Altius, Fortius (Faster, Higher,
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?
and Power Control
Control and Industrial Automation
Analog Dialogue is the technical
magazine of Analog Devices. It discusses products, applications,
technology, and techniques for analog, digital and mixed-signal