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A New How-To Guide for Integrated Electronics Piezoelectric (IEPE) Accelerometers

Over the spring break I dropped by Meggitt Sensing Systems to ask Felix Levinzon to sign my copy of his new book, “Piezoelectric Accelerometers with Integral Electronics,” and I was able to spend some time with him discussing JFETs, MOSFETs, and Russian winters.

Felix Levinzon

Felix Levinzon

Levinzon was a scientist working in the field of low-noise electronics in Russia before coming to the USA in 1993. He joined Endevco/Meggitt in 1996. “And I found this company’s product was very similar to what I did there. This company manufactures sensors which should be low noise and high temperature and small size, everything like this. So I specialize in these fields.”

A native of Russia, Felix received his MS degree from the Radio Engineering University in Taganrog, Russia in 1961 and completed his PhD in Moscow in 1974. He specialized in low-noise electronics.

I’d made about 50 trips to Russia since 1998 to work with Russian scientists with a previous employer, and I talked with Felix about cold Russian winters and the year-round warmth of Southern California. But he said a difference (aside from snow and sub-zero temperatures, either C or F) between working for a U.S. high tech company and the scientific institute in Moscow was, “the biggest product [in Moscow] was to publish papers.”

“When I came here, the company was not so interested in publishing, just designing sensors,” Felix told me. “I like to design sensors, but I also like to publish my designs. Of course there were many restrictions to keep the secrets of the company, but I know how to do this and did this.”

Levinzon said he’s always enjoyed publishing along with designing and producing new products. “So I’ve published already many papers, mostly in IEEE journals, and after this, maybe last year, I start to think it’s time to publish a book based on these papers,” he said. “I found a publisher, and they agreed to publish the book. So I worked for about half of a year and finally they published it in August of last year.”

When Levinzon was researching the literature about IEPE sensors, he found a lot of material had been published on the physics and theory of piezoelectric transducers, but no full-length work on the integrated electronics needed to make these devices useful in many applications.

The design of Integrated Electronics Piezoelectric (IEPE) accelerometers is driven by three basic design constraints, Levinzon said. The first is basic parameter his customers require is temperature range, from cryogenic to more than 200 ̊C. The second is low noise, “as low as possible.” And the third parameter is size and weight, “as small as possible.”

“These are the three parameters which are needed the most, and I specialize in all three,” Levinzon said. “Other parameters are maybe not so critical, voltage supply, current supply,” he said. “Sensitivity, of course it’s important. Range is also maybe not so important compared with the first three.”

The book is an excellent compendium of practical design expertise necessary to develop IEPE devices, whether using an op amp or a low-noise discrete JFET or MOSFET. It’s richly detailed with curves, schematics, equations and test data in addition to descriptions and explanations.

“It’s actually a good book for designers, to know the designs of our sensors, piezoelectric with internal electronics,” Levinzon said. “At the same time I included in the book some measurement results of MOSFETs and JFETs which are used in these sensors. Included also are two parts from [Linear Integrated Systems]. These JFETs have unique parameters, very nice parameters.”

These small-signal discrete semiconductors are often used by Levinzon in die form to optimize his accelerometers for small size and performance in extreme temperatures. “JFETs and MOSFETs for analog applications with time have gotten better and better, in regard to noise and other parameters,” he said. “But unfortunately there are just a few manufacturers of these devices.”

4 comments on “A New How-To Guide for Integrated Electronics Piezoelectric (IEPE) Accelerometers

  1. eafpres
    April 22, 2015

    I find PZ stuff very interesting.  For me, using them in actuators is intriguing.  I've seen commercial applications in things as varied as fuel injectors and motion stages.

  2. mccunets
    June 5, 2017

    This part would be useful for these circuits: https://en.wikipedia.org/wiki/LSK489

  3. EdwardThirlwall
    October 16, 2018

    I'm interested to know about those Russian winters actually! But of course having the opportunity to talk to a professional about technical issues and shedding some light on some of the questions you may have had in your head ranks way up there with them too! Sounds like you had a good meeting with the guy eh?

  4. michaelmaloney
    February 21, 2019

    It must have been such a rewarding and educational experience having to learn from the expert himself. This is the best way indeed to learn the ropes about any particular process that we might have in mind. Reading up and gaining experience make up part and parcel of the learning curve but to hear from the horse's mouth is what matters.

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