Date & Time: 
Sat, 09/29/2018 - 12:00pm
Yook-Kong Yong
Rutgers University, Piscataway, NJ

Discovery Park F175

Piezoelectric SAW and BAW resonators are the de facto elements in electronic devices for frequency control. These piezoelectric resonators are complex three-dimensional structures that are required to maintain a constant frequency under various environmental conditions such as temperature, pressure, shock and vibrations. Ideally the resonators are high Q, low noise and voltage drive level independent.
Lately due to miniaturization of the piezoelectric resonators, higher bandwidths and tighter tolerances for frequency control in telecommunications, the nonlinear effects in these resonators have become an important subject matter for research. Their nonlinear analyses have now become required elements for new and better designs. In this seminar I present and discuss the nonlinear frequency response and time domain response of piezoelectric SAW & BAW resonators. I will present the use of nonlinear time domain studies to validate our nonlinear frequency response models. Derivations of the coupled nonlinear f - 2f - 3f frequency response governing equations and the special numerical techniques will be presented. Results on the nonlinear time domain-FFT study of the f - 2f response of Lithium Niobate YX-127o SAW resonator versus its nonlinear frequency response are shown. The nonlinear f - 3f frequency response of quartz resonators are presented and compared with experimental results on their amplitude-frequency effects. Good comparisons were found.
Yook-Kong Yong is professor at Rutgers University, Dept. of Civil and Environmental Engineering, Piscataway, NJ. He received his B.S. degree in civil engineering from Lafayette College, Easton, PA, his M.A. and Ph.D degrees in structures/mechanics from Princeton University, Princeton, NJ. Prof. Yong holds 9 patents on piezoelectric resonators and technologies. He is a registered Professional Engineer in New Jersey, and has practiced as a consultant to the industry. He serves as an associate editor for the journal IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. He is a member of the IEEE society. At the IEEE Society, he serves as the chair of Technical Program Committee for the IEEE Ultrasonics Symposium 2011, and as a member of the Technical Program Committee for the IEEE Ultrasonics Symposia, and IEEE Frequency Control Symposia. His research interests are in the numerical modeling of bulk acoustic wave and surface acoustic wave piezoelectric resonators and filters; their frequency-temperature behavior, acceleration sensitivity, noise characteristics and thermal stress behavior. He has more than 100 journal and conference proceedings publications on his research interests.

Mechanical Engineering