A Note From the Editor

As we celebrate the 50th anniversary of Analog Dialogue, we’re continuing to improve it. I hope you recognized something new on our Analog Dialogue homepage. Our new StudentZone page has launched and is live. Written especially (but not only) for the next generation of engineers, StudentZone focuses on design challenges, our student program tools, and some basics in electronics. As integrated circuits become more and more complex, our goal is to concentrate on design challenges and provide tips from senior engineers—all written in an easy to understand style. You will find the new StudentZone page here.

This month, Frederik Dostal, one of our power management gurus, has an interesting question to discuss in the StudentZone. Are negative voltage regulators necessary? Since voltages are relative, can’t we use a positive regulator? Plus, our quiz is about PEFF on LDOs … a good subject for testing your knowledge.

For this month’s featured articles, we start with Tx LOL. I need to admit I only understood “LOL,” and even then in the wrong context. Tx LOL refers to transmit local oscillator leakage, which is no laughing matter. If you are working with RF mixers and have not corrected Tx LOL so far, Dave Frizelle, our application manager in the Transceiver Product Group, explains why LOL correction is so important, especially in zero-IF architecture.

While our first feature article addresses a challenge in the RF and wireless world, frequent contributor Frank Kearney and Patrick Pratt talk about cable infrastructure in this month’s second article. After 60 years, it may be time to improve it. Digital predistortion (DPD) could enhance the efficiency in power amplifiers in our cable infrastructure. Frank, an algorithm development manager and currently a doctoral candidate at University College Dublin, and Patrick, a senior research scientist, take a deep dive into the subject and also introduce you to user-adaptable solutions for full duplex (FD) and envelope tracking (ET)—the next generation of cable technologies.

Burned at low power? What happens if you are replacing one part with a better (less power consuming) one and forget to check the power supply specifications? It seems these are not related to each other, doesn’t it? Right out of an FAE customer experience, Abhinay Patil discusses some unexpected regulator phenomena in our RAQ.

And as we have for 50 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.