Office: 615 Whittemore
Mailing Address: 302 Whittemore (0111)
Virginia Tech
Blacksburg, VA 24061
Tel: (540) 231-4942
Fax: (540) 231-3362
vt.edu Email: ha

 

Affiliated Research Group
Director: Multifunctional Integrated Circuits and Systems Group (MICS)

Title: Professor

Education:
Ph.D., Electrical and Computer Engineering, University of Iowa, 1986
M.S., Electrical and Computer Engineering, University of Iowa, 1984
B.S., Electrical Engineering, Seoul National University, 1974

Teaching Interests:
Analog and Mixed-signal IC design, RF IC Design, Low-power VLSI Design, Electronic Circuits

Research Interests:
Analog / Mixed-signal / RF IC Design

• Power management ICs and systems for energy harvesting
• RF IC design for wireless sensor nodes and high speed fiber optical communications
• Wireless motion sensors
• Power line communications at integrated circuits and self-contained systems

Recognition:
IEEE Fellow

Selected Publications:

• S. Wang, V. Chawla, D.S. Ha, and B. Kim, “Low-Voltage Low-Power 1.6 GHz Quadrature Signal Generation through Stacking a Transformer-Based VCO and a Divide-by-two,” IEEE Transactions on Circuits and Systems - I, Vol. 59, No. 12, pp. 2901-2910, December 2012.
• D.-Y. Yoon, C.-J. Jeong, J. Cartwright, H.-Y. Kang, S.-K. Han, N.-S. Kim, D.S. Ha, and S.-G. Lee, “A New Approach to Low-power and Low-latency Wake-up Receiver System for Wireless Sensor Nodes,” IEEE Journal of Solid-State Circuits, Vol. 47, No. 10, pp. 2405 – 2419, October 2012.
• N. Kong and D.S. Ha, “Low-Power Design of a Self-powered Piezoelectric Energy Harvesting System With Maximum Power Point Tracking,” IEEE Transactions on Power Electronics, Vol. 27, No. 5, pp. 2298-2308, May 2012.
• J. Salem and D.S. Ha, “A Robust Receiver for Power Line Communications in Integrated Circuits,” IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), pp. 254-257, August 2012.
• J. Turner, M.N. Ahmed, D.S. Ha, and P. Mattavelli, “A New Approach to the Wide Bandwidth of Piezoelectric Transducers for Vibration Energy Harvesting,” IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), pp. 1064-1067, August 2012.
• C. Quemada and D.S. Ha, “A Compact Resistorless 1.5-V CMOS Current Mirror with a 30-ppm/°C Temperature Coefficient,” International Symposium on Circuits and Systems (ISCAS), pp. 3146-3149, May 2012.
• N. Kong, T.S. Deyerle, and D.S. Ha, “Universal Power Management IC for Small-Scale Energy Harvesting with Adaptive Impedance Matching,” Energy Conversion Congress and Exposition (ECCE), pp. 3859–3863, September 2011.
• Y. Shim, S. Yuwono, S.-J. Kim, J.-M. Kim, S.-K. Han, S.-G. Lee, and D.S. Ha, “A 520 pJ/pulse IR-UWB Radar for Short Range Object Detection,” IEEE RFIC Symposium, RMO2A-4 (4 pages), June 2011.