A Note From the Editor

Welcome to the August issue of Analog Dialogue.

Software simulation is playing a larger role in product development cycles. Even in areas like architecture, simulation models are state of the art. Surprisingly, enhanced simulation models are also used to teach, train, and improve artificial intelligence systems. This is a fascinating intersection of software systems working together, sharing input and data, and comparing results to achieve maximum optimization. There are many ongoing, interesting, and controversial projects in universities around the globe. When I finished university, SPICE simulation was the software for linear design simulation. You will find LTspice® and the Analog Devices SPICE models available for many of our parts. This Analog Dialogue issue features an article about resolver-to-digital converter (RDC) simulation, and many results within the article about composite amplifiers were simulated in LTspice first and verified afterward with a real design.

Back to the articles from the Analog Dialogue.

Software simulation is a major topic when it comes to product development. If you are interested in RDC system design and you want to build your own resolver simulator test bench to do some fault simulation research, this article is for you. Through error analysis, you will explore why high precision is so important for RDC systems. The author, Nandin Xu, is an applications engineer at Analog Devices in Shanghai, China. He joined ADI in 2013 after graduating from Huazhong University of Science and Technology with a master’s degree in control science and control technology in Wuhan, China.

A composite amplifier is an arrangement of two individual amplifiers configured to maximize the benefits of each individual amplifier. In comparison to a single amplifier, some of the major benefits of implementing a composite amplifier are extended bandwidth, minimized noise and distortion, and enhanced dc precision. Jino Loquinario, a product applications engineer for the Linear Products and Solutions Group, discusses this topic. He graduated from Technological University of the Philippines—Visayas.

Power supplies for automotive applications must perform without failure in the face of harsh conditions—the designer must consider all exigencies, including load dump, cold crank, battery reverse polarity, double battery jump, spikes, and other transients defined, as well as mechanical vibration, noise, extremely wide temperature ranges, etc. Though this article focuses on automotive, similar power supply system requirements are common in other markets. Bin Wu and Zhongming Ye focus on critical power supply specifications and solutions in this article. Bin and Zhongming are senior applications engineers, each with a Ph.D. in electrical engineering.

Have you seen Barry Harvey’s article about ppm op amps from last month? In case you missed it, click here. In this issue’s RAQ, Barry discusses the bootstrapping of a low voltage op amp to operate with high voltage signals and supplies. We can take an op amp with rare input characteristics and elevate it to achieve a higher voltage range, better gain accuracy, higher slew rate, and less distortion than the original op amp. Barry Harvey has worked as an analog IC designer, designing nearly every analog circuit and even more. He has an M.S.E.E. from Stanford University. Barry’s hobbies include repairing used test equipment, playing guitar, and working on Arduino-related projects.

A simple diode is often used as a rectifier, as a limiter or clamp circuit, as a variable attenuator, and is even used in voltage doubler circuits. Our StudentZone article starts by investigating the current vs. voltage characteristics of a PN junction diode, and then dives further into the complexities of PN junction diodes. While reading through this article, I realized how important the basics of passive components are and will continue to be. Doug and Antoniu continue the ADALM2000 series, reminding us of the simple, yet important, basics of electronics.

If you haven't already, there’s still time to order the student version of the ADALM2000 at Digi-Key or Mouser.

And as we have for 52 years, we invite you to be part of the dialogue in Analog Dialogue. You can get in touch through our blog, Facebook page, or email. Let us know how we’re doing and what you’d like to see from us in the coming months.