Layman’s guide to low frequency noise measurements

Electronic noise, which can limit the performance of electronic devices, is a nuisance to some. To others, it’s a valuable tool to studying phenomena at a microscopic level. Since the 1940s, researchers have used low frequency noise to non-destructively characterize electronic devices and materials. Low frequency noise measurements (LFNM) offer a detailed view inside the object, revealing fundamental physical and chemical phenomena.

In our tech-heavy modern era, LFNM is becoming increasingly useful. However, since highly sensitive instruments for LFNM aren’t readily available, most researchers need to put together dedicated instruments in their own laboratories to take measurements. Scandurra et al. provide theoretical and practical guidelines for researchers, even those with a limited background in electronic engineering, to develop their own LFNM systems.

“We have been receiving more and more help requests from researchers who work in the fields of devices, materials and sensors, and who would like to apply the LFNM technique,” said author Graziella Scandurra. “This is what prompted us to write the review.”

The authors cover noise estimation techniques, appropriate measurement solutions, applications of LFNM sensors, issues with two-dimensional characterization and potential pitfalls with the technique. They hope their review will help groups choose and set up the right method for their needs.

“We hope that this review will help researchers interested in making noise measurements both from a theoretical and a practical point of view,” Scandurra said. “We are always available to be contacted for help.”

Source: “A review of design approaches for the implementation of low-frequency noise measurement systems,” by G. Scandurra, C. Ciofi, J. Smulko, and H. Wen, Review of Scientific Instruments (2022). The article can be accessed at https://doi.org/10.1063/5.0116589 .