Lj. Ristic

Lj (Ljubisa) Ristic , born 1950 in Nis, Yugoslavia, is a Serbian American engineer, scientist, and entrepreneur known for his contributions to semiconductor technology and devices, sensors, microelectromechanical systems (MEMS), RF systems, and optoelectronic systems.
==Education==
He earned multiple degrees in electronics, including Bachelor of Science (BS), Master of Science (MS), and Ph.D. from University of Nis, Serbia, in 1975, 1982 and 1988, respectively. He also earned on 1997 an MBA in global management from the Thunderbird School of Global Management in Arizona.
==Career Overview==
Ristic's career includes work in both industry and academia. His research has revolved around the design and fabrication of semiconductor solid-state devices and systems, encompassing sensors, microelectromechanical systems (MEMS), RF solutions, and optoelectronic systems.
During his early career at Electronics Industry Nis, he concentrated on the impact of semiconductor processing on the performance of semiconductor devices1. Lj. Ristic et al. "Stress in epitaxial silicon layer caused by CVD-SiO2 densification – influence on transistor characteristics", Proc. 23rd ETAN, Maribor, pp. I347 – I354, June 1979 and the investigation of surface effects on the breakdown voltage of p-n junctions.N.D. Stojadinovic, Lj. Dj. Ristic and B.V. Vidanovic, "New technique for fabrication of low voltage Si Zener diodes", Electronics Letters, vol.17, No.3, pp. 130-132, Feb. 1981 This resulted in the development of a high-volume manufacturing process for reliable products with stable breakdown voltage, leading to the production of millions of reliable devices.
In 1985, Ristic relocated to Canada, joining the Faculty of Electrical Engineering at the University of Alberta, where he continued his research into sensors and MEMS technology while teaching and mentoring students in master's and Ph.D. programs. By 1989, he had achieved the rank of full professor. His work included magnetic field sensor based on bipolar transistors,Lj. Ristic, T. Smy, and H.P. Baltes, "A lateral magnetotransistor structure with linear response to the magnetic field", IEEE Trans. on ED, vol. 36, No. 6, pp. 1076 – 1086, June 1989 silicon Hall devices,Lj. Ristic, M. Paranjape, and M. T. Doan, "2-D Magnetic field sensor based on Vertical Hall Device", Tech. Dig. SSSA Workshop, Hilton Head Island, pp.111=113, 1990 and the pioneering development of integrated devices for three-dimensional sensing of magnetic fields.Lj. Ristic, M. Doan, and M. Paranjape, "3-D magnetic field sensor as a lateral magnetotransistor in CMOS technology", Sensors and Actuators, vol. A22, pp. 770 -775, 1990Lj. Ristic and M. Paranjape, "Hall devices for multidimensional sensing of magnetic field", Sensors and Materials, vol. 5, no. 5, pp. 301 -316, 1994 He also made contributions to silicon micromachining in CMOS technology.Lj. Ristic, "CMOS technology: a base for micromachining", Microelectronics J., vol. 20, Nos. 1-2, pp. 153 – 169, 1989
In 1990, Ristic moved to the USA and joined Motorola in Phoenix, where he led the sensor device group and played a key role in advancing MEMS technology. He developed innovative technologies, including three-polysilicon layer surface micromachining technology and plastic packaging with electrostatic discharge protection.Patent US5146389, "Differential capacitor structure and method", 1992-09-08 Ristic et al. "A capacitive type accelerometer with self-test feature based on double-pinned polysilicon structure", 7th Int. Conf. SSSA, Transducers '93, Yokohama, June 1993Patent US5545912, "Electronic device enclosure including a conductive cap and substrate", 1996-08-13 His work also encompassed the integration of sensing technology with CMOS technology, resulting in significant intellectual property related to microprocessor and sensor integration.Patent US5291607, "Microprocessor having environmental sensing capability", 1994-03-01 Ristic received several awards for his contributions at Motorola, including a Distinguished Innovator, a Golden Badge, and a Silver Quill Award.
In 2000, he assumed the role of Vice President of Technology and Chief Technology Officer at Alpha Industries in Massachusetts.https://investors.skyworksinc.com › news-release-details There he focused on advancing RF technologies and creating new products for wireless, consumer, and fiber-optic applications. He pioneered the development of RF front-end multichip integrated module, which included InGaP power amplifiers, switches, and filters.Lj. Ristic et al. "RF module solutions for the wireless handset market – part 1: switch-filter modules", Microwave Product Digest, Nov. 2001 These components have since become a standard components in modern smartphones, tablets, laptops, and other consumer devices.
After his tenure at Alpha Industries, he continued to work with various startups, contributing to wide range of technological innovations including sensing solutions based on tunnel magnetoresistance technology,Patent US2016084674A1, "Apparatus and Method for Magnetic Sensor Based Surface Shape Analysis", 2016-03-24 MEMS-based battery solutions,Patent US20210135271A1, "Method of fabricating porous wafer battery", 2021-05-06 dynamic laser light solutions for automotive applications,Patent US20200200363A1, "Fiber-delivered laser-induced dynamic light system", 2020-06-25 and the fusion of Lidar and projection technology.D. Lovel et al. "Optical MEMS enable next generation solutions for robot vision and human-robot interaction", Proc. SPIE, vol.12013, id.1201304 15pp., March 2022
==Publications==
Throughout his career, Lj. Ristic has authored more than 100 scientific papers and edited the first book on silicon micromachining technology.https://www. barnesandnoble.com/w/sensor-technology-and-devices-ristic-ljubisa-ristic/1124243383 He has also written extensively on various topics in semiconductor technology, investigating trends related to sensor fusion, transceivers, microprocessors, and MEMS mirrors.
Category:1950 births
Category:People from Niš
Category:Serbian engineers
Category:Scientists
Category:Entrepreneurs