Part 1 of this FAQ looked at the basics of the 20-mA current loop, why it is still used extensively, and its primary attributes. In this part, we’ll look at how the analog current loop is used for digitized signals and at self-powered loops – two developments which have extended its life and viability. Q: […]
20-mA current loops, Part 1: Basic functions
You’ve been given an “easy” assignment: get the low-rate data from a temperature sensor to a control computer located 100 feet (30 m) away, in an industrial setting. After much investigation and assessment, you choose a widely used standard called the 20-mA loop, which has been in use for over 50 years, rather than Wi-Fi, […]
Analog Top Talks in August on EDABoard.com forums
Peer-to-peer, engineer-to-engineer questions and answers from the EDABoard.com engineering community around analog ICs and analog design. Click the “Read more” link and follow the entire conversation and maybe add your two cents by logging in to EDAboard.com. Transformerless power supply help – I use this power supply for a small product where the load is only […]
Electrical noise, Part 2: Additional perspectives
In Part 1, we looked at some facets of noise: sources, external versus internal (intrinsic) noise, and equations. Part 2 goes further into noise specifics. Q: What are some of the types of noise? A: It’s a long list. The same noise may have different names depending on the perspective of the person describing it, […]
One chip, multiple LTE signals for 3G, 4G, and 5G macro cell TDD base station work
Matt Purvis from ADI recently took us through a demo of a super-wideband RF transceiver chip that targets the expanding 5G telecom area. The point of the chip is to transmit multi-carrier LTE signals and to simplify the task of designing MIMO systems. Called the ADRV9009, it is a single-chip time division duplex (TDD) design […]
Inside look at a super-narrow band-pass filter-on-a-chip
The days of constructing bandpass filters from discrete components are pretty much over when it comes to the frequencies involved in modern wireless gear. That’s what makes the video we recently did with Alex Rabinovich from AVX interesting. Alex showed us a bandpass filter characteristic that’s super narrow, and the filter that creates also comes […]
Electrical noise, Part 1: Introductory concepts
Electrical noise is a consideration that engineers think, talk, worry, sometimes obsess about, and deal with nearly all the time, with few exceptions. In many applications, it is the limiting factor on ultimate achievable system performance. If it were not for the existence of noise, many design situations would be far, far easier. Noise is […]
Free lit: The Hitchhiker’s Guide to PCB Design
EMA Design Automation announced the launching of its new and free eBook titled,The Hitchhiker’s Guide to PCB Design, a timely and much-needed resource for electrical engineers seeking to understand the complexities involved in PCB design. “The role of the electrical engineer in PCB design is changing,” said Manny Marcano, president and CEO of EMA. “EE’s are […]
Active noise cancellation, Part 2: Implementation
Part 1 of this FAQ looked at the basic concept of active noise cancellation, how it might be implemented in principle using analog circuitry, and the harsh reality of actually providing the ANC function. Part 2 looks at modern ANC systems and how they function, as well as their practical issues. Q: Is ANC using […]
Active noise cancellation, Part 1: Concept and principles
Electrical noise, whether due to internal circuit external signal sources, is an ever-present factor which ripples through many aspects of the engineer’s design challenge. But there is another kind of noise – namely audio/ acoustic noise – which affects consumers and the individuals, and whose affect engineers are striving to reduce. This noise can affect […]
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