Wireless Communications

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Year 2014

M.N. Ahmed, J. Chong, and D.S. Ha, “A 100 Gb/s Transimpedance Amplifier in 65 nm CMOS Technology for Optical Communications,” International Symposium on Circuits and Systems, pp. 1885 – 1888, June 2014.

Year 2012

Kwang-Jin Koh and Seyed Yahya Mortazavi, "A Finite Delay Response Harmonic Filter," IEEE Trans. on Microwave Theory and Technique (Submitted).
Sang Young Kim, Dong-Woo Kang, Kwang-Jin Koh, and Gabriel M. Rebeiz, "An Improved Wideband All-Pass I/Q Network for Millimeter-Wave Phase-Shifters," IEEE Trans. on Microwave Theory and Technique, vol. 60, No. 11, pp.3431-3439, Nov. 2012
Kwang-Jin Koh, "Silicon RF Phased Array at X-, Q-, W-Band and Beyond," IEEE International Solid-State Circuits Conference (ISSCC)-Forum: Beamforming Technique and RF Transceiver Design, Feb. 2012.
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.

Year 2011

G. M. Rebeiz, Kwang-Jin Koh, Tiku Yu, Dongwoo Kang, Choul Young Kim, Y. Atesal, B. Cetinoneri, Sang Young Kim, K. Ho, Donghyup Shin, “Highly dense microwave and millimeter-wave phased array T/R modules using CMOS and SiGe RFICs,” IEEE 12^th Annual Wireless and Microwave Technology Conference, pp. 1-5, Oct. 2011.
S. Wang, D.S. Ha, B. Kim, and V. Chawla, “A Combined VCO and Divide-by-Two for Low-Voltage Low-Power 1.6 GHz Quadrature Signal Generation,” IEEE Custom Integrated Circuits Conference (CICC), (4 pages), September 2011.

Year 2010

G. M. Rebeiz, Kwang-Jin Koh, Tiku Yu, Dongwoo Kang, Choul Young Kim, Y. Atesal, B. Cetinoneri, Sang Young Kim, Donghyup Shin, “Highly dense microwave and millimeter-wave phased array T/R modules and Butler matrices using CMOS and SiGe RFICs,” IEEE Int. Symposium on Phased Array Systems and Technology (ARRAY), pp. 245-249, Oct. 2010.
P. VanDerVoorn, M. Agostinelli, S.-J. Choi, G. Curello, H. Deshpande, M. A. El-Tanani, W. Hafez, U. Jalan, L. Janbay, M. Kang, K.-J. Koh, K. Komeyli, H. Lakdawala, J. Lin, N. Lindert, S. Mudanai, J. Park, K. Phoa, A. Rahman, J. Rizk, L. Rockford, G. Sacks, K. Soumyanath, H. Tashiro, S. Taylor, C. Tsai, H. Xu, J. Xu, L. Yang, I. Young, J.-Y. Yeh, J. Yip, P. Bai, C.-H. Jan “A 32nm Low Power RF CMOS SOC Technology Featuring High-k/Metal Gate,” IEEE VLSI Technology Symposium, pp. 137-138, June 2010.
Yusuf A. Atesal, Berke Cetinoneri, Kwang-Jin Koh, Gabriel M. Rebeiz, “X/Ku-Band 8-Element Phased Arrays Based on Single Silicon Chips,” IEEE Int. Microwave Symposium, pp. 1258-1261, May 2010.
Kwang-Jin Koh, Gabriel M. Rebeiz, “A 6-18 GHz 5-bit active phase shifter,” IEEE Int. Microwave Symposium, pp. 792-795, May 2010.
Dong-Woo Kang, Kwang-Jin Koh, Gabriel M. Rebeiz, “A Ku-Band Tow-Antenna Four-Simultaneous Beams SiGe BiCMOS Phased Array Receiver,” IEEE Trans. on Microwave Theory and Technique, vol. 58, No. 4, pp. 771-780, April 2010.

Year 2009

Dong-Woo Kang, Kwang-Jin Koh, Gabriel M. Rebeiz, “X/Ku-Band SiGe BiCMOS Phased Array Chips with Simultaneous 2- and 4-Beam Capabilities,” IEEE Compound Semiconductor Integrated Circuits (CSICS) Symp., pp. 1-4, Oct. 2009.
Kwang-Jin Koh, Jason W. May, Gabriel M. Rebeiz, “A Millimeter-Wave (40-45 GHz) 16-Element Phased-Array Transmitter in 0.18-um SiGe BiCMOS technology,” IEEE J. Solid State Circuits (JSSC), vol. 44, No. 5, pp. 1498-1509, May 2009.
A.B. MacKenzie, J.H. Reed, P. Athanas, C.W. Bostian, R. M. Buehrer, L.A. DaSilva, S.W. Ellingson, Y. T. Hou, M.Hsiao, J.-M. Park, C. Patterson, S. Raman, C. da Silva, “Cognitive Radio and Networking Research at Virginia Tech,” Proc. of the IEEE, vol. 97, no. 4, pp. 660—688, Apr. 2009.

Year 2008

Kwang-Jin Koh, Gabriel M. Rebeiz, “A Q-Band Phased-Array Front-End with Integrated Wilkinson Couplers for Linear Power Combining in SiGe BiCMOS,” IEEE Bipolar Circuits and Technology Meeting (BCTM), pp. 190-193, Oct. 2008.
Kwang-Jin Koh, Gabriel M. Rebeiz, “A Q-Band Four-Element Phased-Array Receiver with Integrated Wilkinson Power Combiners in 0.18-um SiGe BiCMOS Technology,” IEEE Trans. on Microwave Theory and Technique (T-MTT), Vol. 56, No. 9, pp. 2046-2053, Sept. 2008
Kwang-Jin Koh, Jason W. May, Gabriel M. Rebeiz, “A Q-Band (40-45 GHz) 16-Element Phased-Array Transmitter in 0.18-um SiGe BiCMOS technology,” IEEE Radio Frequency Integrated Circuits (RFIC) Symp., pp. 225-228 Jun. 2008.
Kwang-Jin Koh, Gabriel M. Rebeiz, “An X- and Ku-Band 8-Element Phased Array Receiver in 0.18-um SiGe BiCMOS Technology,” IEEE J. Solid State Circuits (JSSC), vol. 43, No. 6, pp. 1306-1371, June 2008.

Year 2007

Kwang-Jin Koh, Gabriel M. Rebeiz, “0.13-um CMOS Phase Shifters for X-, Ku- and K-band Phased Arrays,” IEEE J. Solid State Circuits (JSSC), vol. 42, No. 11, pp. 2535-2546, Nov. 2007.
Kwang-Jin Koh, Gabriel M. Rebeiz, “An X- and Ku-Band 8-Element Linear Phased Array Receiver,” IEEE Custom Integrated Circuits Conference (CICC) Proc., pp. 761-764, Sept. 2007.
Kwang-Jin Koh, Gabriel M. Rebeiz, “A 0.13-um CMOS Digital Phase Shifter for K-band Phased Arrays,” IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, pp. 383-386, June 2007.
Kwang-Jin Koh, Gabriel M. Rebeiz, “An Eight-Element 6 to 18 GHz SiGe BiCMOS RFIC Phased-Array Receiver”, Microwave Journal, vol. 50, No. 5, pp. 270-274, May 2007.
I. Chamas and S. Raman, “A Comprehensive Analysis of Quadrature Signal Synthesis in Cross-Coupled RF VCOs,” IEEE Transactions on Circuits and Systems-I, vol. 54, no. 4, pp. 689-704, April 2007.
I. Chamas and S. Raman, “A 5 GHz I/Q Phase-tunable CMOS LC Quadrature VCO (PT-QVCO) for Analog Phase Calibrated Receiver Architectures,” 2007 IEEE Topical Meeting on Silicon Monolithic Circuits in RF Systems Digest, Long Beach, CA, Jan. 18-20, 2007, pp. 269–272. (1st place award, student paper competition)

Year 2006

I. Chamas and S. Raman, “Effect of Device Mismatch on the Phase and Amplitude Accuracy in LC Quadrature VCOs,” 2006 IEEE Radio and Wireless Symp., San Diego, CA, Jan. 17–20, 2006, pp. 439- 442. (2nd place award, student paper competition)

Year 2005

R.C. Palat, J. Kim, J.S. Lee, D.S. Ha, C. Patterson, and J.H. Reed, “Reconfigurable Modem Architecture for CDMA Based 3G Handsets,” 2005 Software Defined Radio Technical Conference and Product Exposition, Session 1.4-01 (7 pages), November, 2005.
J. Kim, D.S. Ha, and J.H. Reed, “A New Reconfigurable Modem Architecture for 3G Multi-Standard Wireless Communication Systems,” International Symposium on Circuits and Systems, pp. 1051–1054, May 2005.
R. Svitek and S. Raman, “DC Offsets in Direct-Conversion Receivers: Characterization and Implications,” IEEE Microwave Magazine, vol. 6, no. 3, pp. 76–86, Sep. 2005.
S. Muthukrishnan, J. Zhao, G. Studtmann, and S. Raman, “A Fully-ESD Protected SiGe HBT RFIC Power Amplifier Design,” 2005 RFIC Symposium, Long Beach, CA, Jun. 12-14, 2005, pp. 605–608.

Year 2004

Kwang-Jin Koh, M-Y Park, C-S Kim, H-K Yu, “Subharmonically pumped CMOS Frequency Conversion (Up & Down) Circuits for 2GHz WCDMA Direct Conversion Transceiver”, IEEE J. Solid State Circuits (JSSC), vol. 39, No. 6, pp. 871-884, June 2004.
R. Svitek and S. Raman, “5-6 GHz SiGe Active I/Q Sub-Harmonic Mixers with Power Supply Noise Effect Characterization,” IEEE Microwave and Wireless Components Letters, vol. 14, no. 7, pp. 319–321, Jul. 2004.
D. Sanderson, R. Svitek, and S. Raman, “A 5-6 GHz Polyphase Filter with Tunable I/Q Phase Balance,” IEEE Microwave and Wireless Components Letters, vol. 14, no. 7, pp. 364–366, Jul. 2004.

Year 2003

Y-S Youn, J-H Jang, Kwang-Jin Koh, Y-J Lee, H-K Yu, “A 2GHz 16dBm IIP3 Low Noise Amplifier in 0.25um CMOS technology,” IEEE Solid-State Circuits Conference (ISSCC) Digest, vol. 1, pp. 452-507, Sep. 2003.
Kwang-Jin Koh, M-Y Park, H-K Yu, “A Merged Structure of LNA & Sub-harmonic Mixer for Multi-band DCR Applications,” IEEE Int. Microwave Symposium, pp. 243-246, Jun. 2003.
S.W. Kim, D. S. Ha, and J.H. Reed, "Minimum Selection GSC and Adaptive Low-Power Rake Combining Scheme,"International Symposium on Circuits and Systems, pp. 357-360, May 2003.
H-J. Lee and D.S. Ha, "An Area and Power Efficient Rake Receiver Architecture for DSSS Systems," IEEE International SOC Conference, pp.103-106, September 2003.
S. Raman, D.I. Sanderson, and A.S. Klein, “DESIGN CONSIDERATIONS FOR MONOLITHIC Si-BASED RF VCOs IN WIRELESS SINGLE-CHIP SYSTEMS,” 2003 IEEE Topical Conference on Wireless Communications Technology, Honolulu, HI, Oct. 15–17, 2003
R. Svitek and S. Raman, “A SiGe Active Sub-Harmonic Front-End for 5-6 GHz Direct Conversion Receiver Applications,” 2003 IEEE RFIC Symp. Digest, Philadelphia, PA, Jun. 8–13, 2003, pp. 675–678.
D. Sanderson and S. Raman, “5-6 GHz SiGe VCO with Tunable Polyphase Output for Analog Image Rejection and IQ Mismatch Compensation,” 2003 IEEE RFIC Symp. Digest, Philadelphia, PA, Jun. 8–13, 2003, pp. 683–686.
R. Svitek and S. Raman, “A SiGe Active Sub-Harmonic Receiver Front-End for 5-6 GHz Wireless Applications,” 2003 IEEE Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, Garmisch, Germany, Apr. 9–11, 2003.

Year 2002

H-J. Lee and D.S. Ha, "A New Low-Power and Area Efficient Rake Receiver Design Without Incurring Performance Degradation," IEEE International ASIC/SOC Conference, pp. 251-255, September 2002.
E.D. McCloskey, R. Pavio, and S. Raman, “1.9 GHz GaAs monolithic filters using Q-enhanced resonators,” IEE Electronics Letters, vol. 38, no. 25, pp. 1682–1683, 5 Dec. 2002.
J. Zhao and S. Raman, “An Integrated Chip-Scale Active Antenna for 5-6 GHz Wireless Microsystems,” 2002 IEEE Radio and Wireless Conference (RAWCON) Digest, Boston, MA, Aug. 11–14, pp. 149–152.
R. Svitek, D. Johnson, and S. Raman, “An Active SiGe Sub-Harmonic Direct-Conversion Receiver Front-End Design for 5-6 GHz Band Applications,” 2002 IEEE RFIC Symp. Digest, Seattle, WA, Jun. 2–4, pp. 395–398.

Year 2001

S. W. Kim, D. S. Ha, J. H. Kim, and J. H. Kim, "Performance of Smart Antennas with Adaptive Combining at Handsets for the 3GPP WCDMA System," IEEE Vehicular Technology Conference, pp. 2048-2052, October 2001.
S. W. Kim, D. S. Ha, J.H. Kim, and J. H. Kim, "Performance Gain of Smart Antennas with Hybrid Combining at Handsets for the 3GPP WCDMA System," International Symposium on Wireless Personal Multimedia Communications, pp. 289-294, September 2001.
S.W. Kim, D.S. Ha, and J.H. Kim, "Performance Gain of Smart Antennas with Diversity Combining at Handsets for the 3GPP WCDMA System," International Conference on Wireless Communications, pp. 235-242, July 2001.
S. W. Kim, D. S. Ha, and J. H. Kim, "Performance of Smart Antennas with Adaptive Combining at Handsets for the cdma2000 System," International Conference on Third Generation Wireless and Beyond, pp. 882-887, May/June 2001.
D. Johnson and S. Raman, “A Packaged SiGe x2 Sub-Harmonic Mixer for U-NII Band Applications,” Proceedings of the 2001 IEEE Bipolar/BiCMOS Circuits and Technology Meeting, Minneapolis, MN, Sep. 30–Oct. 2, pp. 159–162.
J. Zhao and S. Raman, “Design of "Chip-Scale" Patch Antennas for 5-6 GHz Wireless Microsystems,” 2001 IEEE AP-S International Symposium Digest, Boston, MA, Jul. 8–13, vol. 2, pp. 6–9.
R. Bunch and S. Raman, “A 0.35 mm CMOS 2.5 GHz Complementary –GM VCO Using PMOS Inversion Mode Varactors,” 2001 IEEE RFIC Symposium Digest, Phoenix, AZ, May 20-22, pp. 49-52.