Department: ECE
Cornell Net ID: ea85
Title: Assistant Professor

Office:
 Phillips Hall, Room 406
 Ithaca, NY 14853

Phone:
 607/255-0603

[Cornell Directory]

 M.S. California Institute of Technology 2003
 Ph.D. California Institute of Technology 2006

Ehsan Afshari was born in 1979. He received the B.Sc. degree in Electronics Engineering from the Sharif University of Technology, Tehran, Iran and the M.S. and Ph.D. degree in electrical engineering from the California Institute of Technology, Pasadena, in 2003, and 2006, respectively. In August 2006, he joined the faculty in Electrical and Computer Engineering at Cornell University. His research interests are mm-wave and terahertz electronics and low-noise integrated circuits for applications in communication systems, sensing, and biomedical devices

Prof. Afshari serves as the chair of the IEEE Ithaca section, as the chair of Cornell Highly Integrated Physical Systems (CHIPS), as a member of International Technical Committee of the IEEE Solid-State Circuit Conference (ISSCC), as a member of the Analog Signal Processing Technical Committee of the IEEE Circuits and Systems Society, as a member of the Technical Program Committee of the IEEE Custom Integrated Circuits Conference (CICC), and as a member of Technical Program Committee of the IEEE International Conference on Ultra-Wideband (ICUWB).

He was awarded National Science Foundation CAREER award in 2010, Cornell College of Engineering Michael Tien excellence in teaching award in 2010, Defense Advanced Research Projects Agency (DARPA) Young Faculty Award in 2008, and Iran's Best Engineering Student award by the President of Iran in 2001. He is also the recipient of the best paper award in the Custom Integrated Circuits Conference (CICC), September 2003, the first place at Stanford-Berkeley-Caltech Inventors Challenge, March 2005, the best undergraduate paper award in Iranian Conference on Electrical Engineering, 1999, the recipient of the Silver Medal in the Physics Olympiad in 1997, and the recipient of the Award of Excellence in Engineering Education from Association of Professors and Scholars of Iranian Heritage (APSIH), May 2004.

Broadly speaking, Prof. Afshari is interested in the fields of analog circuit design. More specifically, his research interest is the application of the mathematical theory of wave propagation to high performance circuit design. He has been able to blend multiple disciplines within the fields of electrical engineering, applied physics and mathematics into a coherent research theme. The result has been the development of novel circuit design techniques for very high-frequency and/pr high power applications.

In addition to the practical circuit-based research, he has conducted purely theoretical mathematical analysis in the general field of wave propagation in linear and nonlinear electrical media.

1. W. Lee, M. Adnan, O. Momeni, and E. Afshari, "A Nonlinear Lattice for High Am-plitude, Picosecond Pulse Generation in CMOS," IEEE Transactions on Microwave Theory and Techniques, vol. 60, no. 2, Feb. 2012.
2. W. Lee and E. Afshari, "A CMOS Noise Squeezing Amplifier," IEEE Transactions on Microwave Theory and Techniques, vol. 60, no. 2, Feb. 2012.
3. R. Han, Y. Zhang, Y. Kim, S. Shichijo, E. Afshari and K. K. O, "860GHz and 280GHz Image Sensors Using Schottky-Barrier Diodes in 130-nm CMOS," Proc. of IEEE International Solid-State Circuits Conference (ISSCC), 2012
4. Y. Tousi and E. Afshari, "A 283-to-296GHz VCO with 0.76mW Peak Output Power in 65nm CMOS," Proc. of IEEE International Solid-State Circuits Con- ference (ISSCC), 2012.
5. O. Momeni and E. Afshari, "A Terahertz Broadband Traveling-Wave Frequency Multiplier on CMOS," invited to the special issue of the IEEE Journal of Solid-State Circuits, vol. 46, no. 12, Dec. 2011 (pdf).
6. Y. Tousi and E. Afshari, "A Miniature 2mW 4b 1.2GS/s Delay-Line Based Data Converter," IEEE Journal of Solid-State Circuits, vol. 46, no. 10, Oct. 2011 (pdf).
7. O. Momeni and E. Afshari, "High Power Terahertz and Sub-millimeter-Wave Oscillator Design: A Systematic Approach," IEEE Journal of Solid-State Circuits, vol. 46, no. 3, pp. 583-597, March 2011 (pdf).
8. W. Lee and E. Afshari, "Low Noise Parametric Resonant Amplier," IEEE Transaction on Circuits and Systems I: Regular Papers, vol.58, no.3, pp.479-492, March 2011 (pdf).
9. G. Li and E. Afshari, "A Distributed Dual-Band LC Oscillator Based on Mode Switching," IEEE Transactions on Microwave Theory and Techniques, vol.59, no.1, pp.99-107, Jan. 2011 (pdf).
10. O. Momeni and E. Afshari, "A 220-275 GHz Traveling Wave Frequency Doubler with -6.6 dBm Power at 244 GHz in 65 nm CMOS," Proc. of IEEE International Solid-State Circuits Conference (ISSCC), pp.286-288, 20-24 Feb. 2011.
11. O. Momeni and E. Afshari, "A High Gain 107 GHz Amplier in 130 nm CMOS," Proc. of IEEE Custom Integrated Circuits Conference (CICC), 18-21 Sept. 2011.
12. M. Adnan and E. Afshari, "A Low Conversion Loss Passive Frequency Doubler," Proc. of IEEE Custom Integrated Circuits Conference (CICC), 18-21 Sept. 2011.
13. W. Lee and E. Afshari, "An 8 GHz, 0.45dB NF CMOS LNA employing noise squeezing," Proc. of IEEE Radio Frequency Integrated Circuits Symposium (RFIC), 5-7 June 2011.
14. S. Saadat, M. Farahani, H. Mosallaei, and E. Afshari, "Metamaterials Integrated with Active Electronic Circuits," Proc. of IEEE International Symposium on Antennas and Propagation, 3-8 July 2011.
15. M. Adnan and E. Afshari, "Phase Matching using Bandgap Structures for Efficient Parametric Frequency Conversion," Proc. of European Microwave Conference, 9-14 Oct. 2011.
16. O. Momeni and E. Afshari, "A 10-Gb/s Inductor-less Transimpedance Amplifier," IEEE Transaction on Circuits and Systems II: Express Briefs, vol.57, no.12, pp.926-930, Dec. 2010.
17. Y. Tousi and E. Afshari, "2-D Electrical Interferometer: A Novel High Speed Quantizer," IEEE Transactions on Microwave Theory and Techniques, vol.58, no.10, pp.2549-2561, Oct. 2010 (pdf).
18. G. Li and E. Afshari, "A Low-Phase-Noise Multi-Phase Oscillator Based on Left- handed LC-Ring," IEEE Journal of Solid-State Circuits, vol.45, no.9, pp.1822-1833, Sept. 2010 (pdf).
19. W. Lee and E. Afshari, "Distributed Parametric Resonator: A Passive CMOS Frequency Divider," IEEE Journal of Solid-State Circuits, vol.45, no.9, pp.1834-1844, Sept. 2010 (pdf).
20. G. Lilis, J. Park, W. Lee, H. S. Bhat and E. Afshari, "Harmonic Generation Using Non- linear LC Lattices," IEEE Transactions on Microwave Theory and Techniques, vol.58, no.7, pp.1713-1723, July 2010 (pdf).
21. H. S. Bhat, W. Lee, G. Lilis, and E. Afshari, "Steady-State Perturbative Theory for Nonlinear Circuits," Journal of Physics A: Mathematical and Theoretical, vol. 43, no. 20, pp. 205101-205101-16, May 2010 (pdf).
22. O. Momeni and E. Afshari, "Electrical Prism: a High Quality Factor Filter for mm- Wave and Terahertz Frequencies," IEEE Transactions on Microwave Theory and Tech- niques, vol.57, no.11, pp.2790-2799, Nov. 2009 (pdf).
23. G. Li, Y. Tousi, A. Hassibi, and E. Afshari, "Delay-line Based Analog-to-Digital Converters," IEEE Transaction on Circuits and Systems II: Express Briefs, vol.56, no.6, pp.464-468, June 2009 (pdf).
24. E. Afshari and H. S. Bhat, "Nonlinear Constructive Interference in Electrical Lattices," Physical Review E, vol. 77, no. 6, pp.066602-066602-13, June 2008 (pdf).
25. E. Afshari, H. S. Bhat, and A. Hajimiri, "Ultrafast Analog Fourier Transform Using 2-D LC Lattice," IEEE Transaction on Circuits and Systems I: Regular Papers, vol.55, no.8, pp.2332-2343, Sept. 2008 (pdf).
26. E. Afshari, H. S. Bhat, A. Hajimiri, and J. E. Marsden, "Extremely Wideband Signal Shaping using One and Two Dimensional Non-Uniform Nonlinear Transmission Lines," Journal of Applied Physics, vol. 99, no. 5, pp.054901-054901-16, Mar 2006 (pdf).
27. E. Afshari and A. Hajimiri, "A Non-Linear Transmission Lines for Pulse Shaping in Silicon," IEEE Journal of Solid-State Circuits, vol.40, no.3, pp. 744- 752, March 2005 (pdf)
28. E. Afshari, H. S. Bhat, X. Li, and A. Hajimiri, "Electrical Funnel: A Broadband Signal Combining Method," Proc. Of IEEE International Solid-State Circuits Conference(ISSCC), pp.751-760, 6-9 Feb. 2006.
29. E. Afshari and A. Hajimiri, "A Non-Linear Transmission Lines for Pulse Shaping in Silicon," Proc. of Custom Integrated Circuits Conference (CICC), pp. 91- 94, 21-24 Sept. 2003 (Best paper award).