l Carnegie Mellon Univ., Pittsburgh, U.S.A Dec.2015
PhD in Electrical and Computer Engineering.
l Univ. of Pennsylvania, Philadelphia, U.S.A Jul.2012
(PhD student of Engineering, Electrical Engineering.)
Master Degree in Electrical Engineering.
l Politecnico di Torino, Turin, Italy
Bachelor of Engineering, Electronic Engineering. Jul.2010
I have been working in the areas of RF MEMS, acousto-electronic technology including resonators and filters, piezoelectric materials including Lithium niobate (LN) and Aluminum nitride (AlN) and MEMS-enabled IC design since 2010. Work has included research, fabrication and development at a variety of levels including mechanical computing, Finite element analysis (FEA) based simulation, device design and circuits. Research has been sponsored by NSF, DARPA, and Samsung funds.
l DARPA RF-FPGA project, team leader, Jul. 2012 – present, Carnegie Mellon Univ., led in developing the 2nd generation LN laterally vibrating resonators (LVRs) and field-programmable filters (enable multiple frequencies on the single chip, bandwidth tuning, filter order selection and temperature compensation(~ 0 ppm/˚C achieved))
l Designed and optimized MEMS Resonator and peripheral circuits for filtering implementation
l Developed technology platform for engineering the Temperature Coefficient of Frequency of LN resonators
l Innovated resonator design enabling: (i) a considerable improvement of kt 2 (2X improvement), (ii) significant spurious mode suppression, and robustness to processing (iii) misalignment and (iv) over/under-etching.
l Developed, optimized and implemented fabrication process for LN/SiO2/LN and LN/SiO2/Si platform
l Implemented RF characterization, testing & fitting
l DARPA MiNaSIP project, Sep.2010-Jul.2012, Univ. of Pennsylvania, took charge of design, fabrication and demonstration of 1st generation of LN MEMS resonator (achieved 10X enhancement of coupling factor (kt2 ~ 15-20%) compared to AlN resonators and hence greatly increase filter bandwidth)
l Designed the first prototype of LN LVRs
l Developed computing method/code to calculate piezoelectric parameters for LN of different orientations
l Developed fabrication process including critical step such as Cl2 based etching recipe for LN resonator and bonding process for LN on LN through BCB
l Energy Characterization of CNT (Carbon Nano Tube) Based Devices, Sept. 2014 – Dec. 2014, Carnegie Mellon Univ. implemented CNT based full adder attained significant energy saving (achieved 10 times reduction) than the corresponding FINFET implementation
l Designed logic units and full adder through CNFETs and FINFETs
l Established power dissipation (both static and dynamic) model from both gate level and circuit level
l Characterized circuit functionality and power consumption of designed CNFETs based and FINFETs based adder for high frequency operation through HSPICE for CNFETs and FDSOI technology comparison
l Analog circuit design and analysis , Sept. 2010 – Dec. 2010, Univ. of Pennsylvania,
l Designed ALU using primarily MOS technologies at the transistor and higher levels
l Used Cadence to draw layout, capture schematics and run simulations for performance analysis using Spectre
l Heap project, Jan.2012-Jul.2012, Politecnico di Torino, took charge of code parallelization and analysis
l Implemented the code parallelization with C++
l Analyzed the efficiency enhancement with respect to conventional coding
l 18493 Electroacoustics, Sept. 2014 – Dec. 2014, Carnegie Mellon Univ.,
l Gave exercise class/recitation on wave equation, sound propagation from different sources, lumped-parameter electrical circuit analogies and design of loudspeakers, microphones, and other transducers.
l Prepared and graded homework/exams
l 18615 Micro and Nano Systems Fabrication, Jan. 2014 - May. 2014, Carnegie Mellon Univ.,
l led a whole series of labs that design, fabricate, test and analyze AlN resonators
l taught design methodology, process flow and equipment functionalities for integrated systems fabrication
Conference Publications & Presentation:
S. Yen, L. Shi, G. Piazza, G. Fedder, and T. Mukherjee "A Tunable Notch Filter Using High- kt2 Lithium Niobate Resonators toward Integration in Filter Banks", in IEEE IMS, 2015
L. Shi and G. Piazza, “Investigation on Quality Factor for High Frequency Laterally Vibrating LN on SiO2 Microresonators”, in IEEE IUS, pp. 578–581, Sept. 2014.
L. Shi and G. Piazza, “Ion-sliced lithium niobate on silicon dioxide for engineering the temperature coefficient of frequency of laterally vibrating resonators,” in Proc. IEEE EFTF/IFCS, pp. 417–420, Jul. 2013.
S. Gong, L. Shi, and G. Piazza, "High electromechanical coupling resonators using ion sliced X-cut LiNbO3 thin film," in 2012 IEEE MTT-S int. Microwave Symp. Dig. pp. 1-3, 17-22, June, 2012.
Journal Publications:
L. Shi and G. Piazza, “Lithium Niobate on Silicon Dioxide Suspended Membranes: a Technology Platform for Engineering the Temperature Coefficient of Frequency of High Electromechanical CouplingResonators” J. Microelectromech. Syst., vol. 23, issue. 6, pp. 1318 –1329, Dec. 2014.
Conference Posters& Presentation:
L. Shi and G. Piazza, “Active Reflectors for High Performance Lithium Niobate on Silicon Dioxide Resonators”, in IEEE MEMS, Jan.2015
L. Shi and G. Piazza, “Ion-sliced lithium niobate on silicon dioxide for engineering the temperature coefficient of frequency of laterally vibrating resonators,” in Proc. IEEE EFTF/IFCS, pp. 417–420, Jul. 2013.
L. Shi, S. Yazici, S. Gong and G. Piazza, “MiNaSIP Research at Penn” in DARPA annual review, Sept. 2011.
Application software: COMSOL, Matlab, Cadence, ADS, SRIM, JMP
Fabrication technique: AFM, SEM, Sputtering, RIE, ALD, RTA, Lithography, PECVD, Characterization
Programming language: Hspice, C/C++, Verilog, SKILL, Python
Languages: Chinese (native proficiency), English (bilingual proficiency), Italian (limited working proficiency), Korean(limited working proficiency)
Others: Modeling/fitting, Data analysis, Project management, statistic/machine learning
l Most valued paper of Journal of Microelectromechanical Systems, Jan.2015
l PhD fellowship of Carnegie Mellon University (Merit-based fellowship) , Sept. 2014
l Nominated for best paper award at IEEE IFCS (International Frequency Control Symposium) 2013, July 2013
l PhD fellowship of University of Pennsylvania (Merit-based fellowship), Sept. 2010
l Graduate with First Honor of Politecnico di Torino, Turin, Italy, Jul. 2010
l Full Scholarship of Piedmont issued by the government of Piedmont to the most outstanding students in the state for 3 years continuously, 2007-2010
l Excellent academic achievement scholarship, Apr., 2007 (16 out of 256 undergraduates)
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*Top 10 campus singer 2007
*1st prize in national calligraphy competition 2006
*2nd prize in national chemistry Olympic 2006
*3rd prize in national math Olympic 2006
*1st prize in national biology Olympic 2006
*1st prize in national computer Olympic 2006
*3rd prize in composition contest in Wuhan 2003
*1st prize in oral English competition in Wuhan 2003
*1st prize in dancing competition in Wuhan 1994
Electroacoustics Special topics in Applied Physics: Waves and Applications Vibrations of Mechanical Systems
l Journal of Applied Physics
l IEEE Electron Device Letters
l Sensors and Actuators, A Physical
l IEEE Transactions on Electron Devices
l IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
l Applied Physics Letters