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Advanced RF and Mixed-signal Application Group Publications

Most Recent International Conference Papers

  1. [Invited Paper] M. Chahardori, M. A. Hoque, M. A. Mokri, and D. Heo, “A Compact Mm-Wave Multi-Band VCO Based on Triple-Mode Resonator for 5G and Beyond,” accepted to the IEEE International Symposium on Radio-Frequency Integration Technology (RFIT), presented in September, 2022.
  2. S. Mohapatra, C. C. Lin, M. Chahardori, E. Ghaderi, M. A. Hoque, S. Gupta, and D. Heo “A 345μW 1GHz Process and Temperature Invariant Constant Slope-and-Swing Ramp-based 7-bit Phase Interpolator for True-Time-Delay Spatial Signal Processors,” accepted to the IEEE Radio Frequency Integrated Circuits Symposium (RFIC), presented in June, 2022.
  3. M. A. Hoque, M. Chahardori, M. A. Mokri, S. Mohapatra, D. Kar, and D. Heo “A Low Phase Noise 28 GHz VCO Using Transformer-based Q-enhanced Active Impedance Converter,” accepted to the IEEE International Microwave Symposium (IMS), to be presented in June, 2022.
  4. J. W. Kunzler, K. F. Warnick, M. Chahardori, and D. Heo, “Wideband RFI cancellation using true time delays and a Hadamard projection operator,” accepted to the IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, to be presented in Dec., 2021.
  5. C. C. Lin, C. Puglisi, V. Boljanovic, S. Mohapatra, H. Yan, E. Ghaderi, D. Heo, D. Cabric, and S. Gupta, “A 4-Element 800MHz-BW 29mW True-Time-Delay Spatial Signal Processor Enabling Fast Beam-Training with Data Communications,” ESSCIRC 2021 – IEEE 47th European Solid State Circuits Conference (ESSCIRC), 2021, pp. 287-290, doi: 10.1109/ESSCIRC53450.2021.9567822.
  6. M. Chahardori, M. A. Hoque, and D. Heo, “Reconfigurable Low Phase Noise Four-Core Triple-Band VCO based on Multi-mode Resonator for 5G and Beyond”, accepted in Semiconductor Research Corporation (SRC) Techcon, Sept. 2021.
  7. M. A. Hoque, and D. Heo, “A Triple-band Low Phase Noise K/Ka-Band VCO with a New Dual-path Inductor for 5G and SATCOM Applications,” accepted in Semiconductor Research Corporation (SRC) Techcon, Sept. 2020.
  8. [Student Paper Competition Finalist] M. A. Hoque, M. Chahardori, P. Agarwal, M. A. Mokri and D. Heo, “Octave Frequency Range Triple-band Low Phase Noise K/Ka-Band VCO with a New Dual-path Inductor,” 2020 IEEE/MTT-S International Microwave Symposium (IMS), Los Angeles, CA, USA, 2020, pp. 341-344, doi: 10.1109/IMS30576.2020.9223770.
  9. P. Agarwal, M. Chahardori and D. Heo, “An X-band LC VCO Using a New Boosted Active Capacitor With 53 % Tuning Range and -202.4 dBc/Hz FoMT,” 2020 IEEE/MTT-S International Microwave Symposium (IMS), Los Angeles, CA, USA, 2020, pp. 357-360, doi: 10.1109/IMS30576.2020.9223827.
  10. V. Boljanovic, H. Yan, E. Ghaderi, D. Heo, S. Gupta and D. Cabric, “Design of Millimeter-Wave Single-Shot Beam Training for True-Time-Delay Array,” 2020 IEEE 21st International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Atlanta, GA, USA, 2020, pp. 1-5, doi: 10.1109/SPAWC48557.2020.9154233.
  11. Z. Zhou, N. Tang, B. Nguyen, W. Hong, P. P. Pande and D. Heo, “A Wide Output Voltage Range Single-Input-Multi-Output Hybrid DC-DC Converter Achieving 87.5% Peak Efficiency With a Fast Response Time and Low Cross Regulation for DVFS Applications,” 2020 IEEE Custom Integrated Circuits Conference (CICC), 2020, pp. 1-4, doi: 10.1109/CICC48029.2020.9075892.
  12. Zhiyuan Zhou, Syrine Belakaria, Aryan Deshwal, Wookpyo Hong, Jana Doppa, Partha Pratim Pande, and Deukhyoun Heo, “Design of Multi-Output Switched-Capacitor Voltage Regulator via Machine Learning,” 2020 Design, Automation & Test in Europe Conference & Exhibition (DATE), 2020, pp. 502-507, doi: 10.23919/DATE48585.2020.9116413.
  13. S. Gopal, D. Heo, and T. Karnik, “Hierarchical Design Methodology and Optimization for Proximity Communication based Contactless 3D ThruChip Interface,” in 2019 International 3D Systems Integration Conference (3DIC), Sendai, Japan, 2019, pp. 1-6, doi: 10.1109/3DIC48104.2019.9058859.
  14. S. N. Ali, M. A. Hoque, S. Gopal, M. Chahardori, M. A. Mokri, and D. Heo, “A Continually-Stepped Variable-Gain LNA in 65-nm CMOS Enabled by a Tunable-Transformer for mm-Wave 5G Communications,” in IEEE MTT-S Int. Microw. Symp. Dig., Boston, MA, USA, Jun. 2019, doi: 10.1109/MWSYM.2019.8701023.
  15. S. Gopal, M. Chahardori, M. A. Hoque, S. N. Ali, M. A. Mokri, and D. Heo, “Dual-Equalization-Path Energy-Area-Efficient Near-Field Inductive Coupling Link for Contactless 3D IC,” in 2019 IEEE MTT-S Int. Microw. Symp. Dig., Boston, MA, USA, Jun. 2019, doi: 10.1109/MWSYM.2019.8701097.
  16. M. A. Hoque, S. N. Ali, M. A. Mokri, S. Gopal, M. Chahardori, and D. Heo, “A Highly Efficient Dual-band Harmonic-Tuned GaN RF Synchronous Rectifier with Integrated Coupler and Phase Shifter,” in 2019 IEEE MTT-S Int. Microw. Symp. Dig., Boston, MA, USA, Jun. 2019, doi: 10.1109/MWSYM.2019.8700900.
  17. Bai Nguyen, Nghia Tang, Zhiyuan Zhou, Wookpyo Hong, Deukhyoun Heo, Yangyang Tang, Philipp Zhang, “A Sub-1V Analog-Assisted Inverter-Based Digital Low-Dropout Regulator with a Fast Response Time at 25mA/100ps and 99.4% Current Efficiency”, in IEEE Custom Integrated Circuits Conference – (CICC), Austin, TX, USA, 2019, doi: 10.1109/CICC.2019.8780173.
  18. N. Tang, B. Nguyen, Y. Tang, W. Hong, Z. Zhou and D. Heo, “8.4 Fully Integrated Buck Converter with 78% Efficiency at 365mW Output Power Enabled by Switched-Inductor-Capacitor Topology and Inductor Current Reduction Technique” in IEEE International Solid – State Circuits Conference – (ISSCC), San Francisco, CA, 2019, pp. 152-154. doi: 10.1109/ISSCC.2019.8662530.
  19. [Best Paper Candidate] S. Gopal, P. Agarwal, S. N. Ali, J. Baylon and D. Heo, “An Echo-Canceller-Iess NFIC- TSV Hybrid 3D Interconnect for Simultaneous Bidirectional Vertical Communication,” 2018 IEEE/MTT-S International Microwave Symposium – IMS, Philadelphia, PA, 2018, pp. 663-666.doi: 10.1109/MWSYM.2018.8439430.
  20. J. Baylon, S. Gopal, L. Renaud, S. N. Ali and D. Heo, “A Low Power Active-Passive Dual Gm-boosted W-band Oscillator for Wireless Networ -on-Chip Applications,” 2018 IEEE/MTT-S International Microwave Symposium – IMS, Philadelphia, PA, 2018, pp. 1427-1430. doi: 10.1109/MWSYM.2018.8439862.
  21. S. Gopal, P. Agarwal, J. Baylon, S. N. Ali, M. A. Hoque and D. Heo, “A Scalable Multi-Channel CMOS Mixer-Cell Ring Oscillator Dot Product Circuit for High-Throughput Computing” in IEEE International Symposium on Circuits and Systems-Late Breaking News (ISCAS), Italy, 27-30 May 2018.
  22. S. N. Ali, P. Agarwal, J. Baylon, S. Gopal, L. Renaud and D. Heo, “A 28GHz 41%-PAE linear CMOS power amplifier using a transformer-based AM-PM distortion-correction technique for 5G phased arrays,” 2018 IEEE International Solid – State Circuits Conference – (ISSCC), San Francisco, CA, 2018, pp. 406-408. doi: 10.1109/ISSCC.2018.8310356.
  23. [Invited] S. Das, S. Gopal, D. Heo and P. P. Pande, “Energy-efficient and robust 3D NoCs with contactless vertical links (Invited paper),” 2017 IEEE/ACM International Conference on Computer-Aided Design (ICCAD), Irvine, CA, 2017, pp. 1-6. doi: 10.1109/ICCAD.2017.8501894.
  24. [Best Paper Candidate] S. Gopal, S. Das, P. P. Pande and D. Heo, “Energy and Area Efficient Near Field Inductive Coupling: A Case study on 3D NoC” in 11th IEEE/ACM International Symposium on Networks-on-Chip (NoCS), Seoul, South Korea, 19-20 October 2017.
  25. B. Nguyen, Z. Zhou, W. Hong, and D. Heo, “Low-Noise Multiple-Output Switched-Capacitor Power Management System for System-on-Chip,” Semiconductor Research Corporation (SRC) Techcon, Sept. 2017.
  26. [Invited] P. Agarwal, S. N. Ali, and D. Heo, “Reconfigurable Phased-Array Design Techniques for 5G and Beyond Applications,” in IEEE International Symposium on Radio Frequency Integration Technology (RFIT), Seoul, Korea, Sept. 2017. 
  27. S. N. Ali, P. Agarwal, S. Mirabbasi and D. Heo, “A 42–46.4% PAE continuous class-F power amplifier with Cgd neutralization at 26–34 GHz in 65 nm CMOS for 5G applications,” 2017 IEEE Radio Frequency Integrated Circuits Symposium (RFIC), Honolulu, HI, USA, 2017, pp. 212-215. doi: 10.1109/RFIC.2017.7969055
  28. S. N. Ali, P. Agarwal and D. Heo, “Reconfigurable High Efficiency Power Amplifier with Tunable Coupling Coefficient Based Transformer for 5G Applications”, in IEEE MTT-S International Microwave Symposium (IMS), Honolulu, Hawaii, USA, 4-9 June 2017. [accepted]
  29. J. Baylon, S. N. Ali, P. Agarwal, S. Gopal, D. Heo, “Current Reuse Triple-Band Signal Source for Multi-Band Wireless Network-on-Chip” in IEEE MTT-S International Microwave Symposium (IMS), Honolulu, Hawaii, USA, 4-9 June 2017 [accepted].
  30. T. N. Nguyen, P. Agarwal and D. Heo, “A 5.8 GHz and -192.9 dBc/Hz FoMT CMOS class-B capacitively-coupled VCO with Gm-enhancement,” in IEEE MTT-S International Microwave Symposium (IMS), vol., no., pp.1-4, 22-27 May 2016.
  31. S. P. Sah, P. Agarwal and D. Heo, “A low power sub-harmonic injection locked 2×2 mm-wave beamforming receiver array,” IEEE International Symposium on Circuits and Systems (ISCAS), Montreal, QC, pp. 1558-1561, May 22-27 2016.
  32. P. Agarwal, L. Renaud, J. Baylon, D. Majumdar, D. Heo, and C. Schlegel “2.45 GHz, 100 Mbps BPSK-DSSS Transmitter for Interference-Robust Wireless Neuroprosthetic Networks”, IEEE European Microwave Conference (EuMC), vol., no., pp. 877-880, 7-10 Sep. 2015.
  33. [Best Paper Award, Second position] P. Agarwal, P. P. Pande, D. Heo, “25.3 GHz, 4.1 mW VCO with 34.8% Tuning Range Using a Switched Substrate-Shield Inductor”, in IEEE MTT-S International Microwave Symposium (IMS), vol., no., pp.1-4, 17-22 May 2015. 
  34. X. Yu, D. Heo, P. P. Pande, S. Mirabbasi, “A 60-GHz LNA with feed-forward bandwidth extension technique for wireless NoC application”, Proc. Eur. Microw. Integr. Circuits Conf. (EuMIC), 9th, vol., no., pp. 1-4,  6-7 Oct 2014. 
  35. S. P. Sah, Y. You, P. Agarwal, and D. Heo, “A 8-40 GHz, 8 mW LNA with 27 dB Peak Gain and 5.2 dB NF for Multiband Applications,” IEEE European Microwave Conference (EuMC), 9th , vol., no., pp.182-185, 6-7 Oct. 2014..
  36. S. P. Sah, and D. Heo, “A Low Power K- and Ka-band Receiver for Beamforming Applications,” in Proc. European Radar Conference (EuRAD), 2014.
  37. S. P. Sah, S. Mirabbasi and D. Heo, “An Inductively Gm Enhanced 34 GHz VCO with Gain Linearization and Switched Transformer Tuning”, in IEEE MTT-S International Microwave Symposium (IMS), vol., no., pp.1-4, 1-6 June 2014.
  38. S. P. Sah and D. Heo, “ A 12 GHz IF Bandwidth Low Power 5-17 GHz V-band Positive Transformer-Feedback Down-Conversion Mixer,” in IEEE MTT-S International Microwave Symposium (IMS), vol., no., pp.1-4, 1-6 June 2014. 
  39. P. Agarwal, J. Baylon, S.P. Sah, D. Majumdar, D. Heo, C. Schlegel, “A 330 µW, Gm-boosted VCO with −205 dB FoMT and 35 % tuning range using class-b biasing,” in Microwave Symposium (IMS), IEEE MTT-S International , vol., no., pp.1-4, 1-6 June 2014.
  40. P. Agarwal, S. P. Sah, D. Heo, “A 4.8 mW, 4.4 dB NF, Wideband LNA Using Positively Coupled Transformer for V-band Applications,” IEEE MTT-S International Microwave Symposium (IMS), International , vol., no., pp.1-3, 1-6 June 2014.
  41. S. P. Sah and D. Heo, “An 8th Sub-Harmonic Injection Locked V-band VCO for Low Power LO Routing in mm-Wave Beamformers,” in IEEE Radio Frequency Integrated Circuits Symposium, vol., no., pp.177-180, 1-3 June 2014
  42. S. P. Sah, P. Agarwal, D. Heo, “A low power 8th sub-harmonic injection locked receiver for mm-Wave beamforming applications,” in IEEE Radio Frequency Integrated Circuits Symposium, vol., no., pp.401-404, 1-3 June 2014
  43. P. Agarwal, S. P. Sah, and D. Heo, “A Low Leakage Pull-Down Network for PLL with 6.7 dB Improvement in Reference Spur”, Asia Pacific Microwave Conference (APMC) 2013.
  44. S. P. Sah and D. Heo, ” An Ultra-Wideband 15-35 GHz Phase-Shifter for Beamforming Applications “,in Proc. of The European Microwave Integrated Circuits Conference (EuMIC) 2013, pp. 264-267. Oct 2013.
  45. Y. You, S. Zhu, K. F. Warnick, S. P. Sah, and D. Heo, “A Low Phase Error X-band Eight-Channel SiGe PIN Diode Phased Array Receiver,” The European Microwave Integrated Circuits Conference (EuMIC), 2013, pp. 268-271. Oct 2013.
  46. S. Zhu, Y. You, K. F. Warnick, S. P. Sah and D. Heo, “An 8-channel Ku Band Transmitter Beamformer with Low Gain/Phase Imbalance between Channels”, European Microwave Conference (EuMW), 2013, pp. 947-950. Oct 2013.
  47. S. P. Sah and D. Heo, “A Low Power K− and Ka−band Receiver for Beamforming Applications”, In Proc. of Semiconductor Research Corporation TECHCON 2013, Sept. 2013.
  48. S. P. Sah, X. Yu, P. Agarwal, Hooman Rashtian, P. P. Pande, D. Heo and Shahriar Mirabbasi, “A V-band Wide Locking Range Injection Locked CMOS VCO for Wireless Network-on-Chip Receiver “, in Proc. IEEE MTT-S International Microwave Symposium Digest (MTT) 2013.
  49. S. P. Sah, S. Zhu, T. N. Nguyen, X. Yu and D. Heo, “A 12-40 GHz Low Phase Variation Highly Linear BiCMOS Variable Gain Amplifier “, ISCAS 2013, pp.1119,1122, 19-23 May 2013. doi: 10.1109/ISCAS.2013.6572047.
  50. Sujay Deb, Kevin Chang, Xinmin Yu, Amlan Ganguly, Partha Pande, Deuk Heo and Benjamin Belzer, “CMOS Compatible Many-Core NoC Architectures with Multi-Channel Millimeter-Wave Wireless Links,” Proceedings of ACM Great Lake Symposium on VLSI (GLSVLSI), pp. 165-170, May 2012
  51. Sujay Deb, Kevin Chang, Amlan Ganguly, Xinmin Yu, Christof Teuscher, Partha Pande, Deukhyoun Heo and Benjamin Belzer, “Design of an Efficient NoC Architecture using Millimeter-Wave Wireless Links,” Proceedings of IEEE International Symposium on Quality Electronic Design (ISQED), pp. 165-172, 19th -21st, March 2012
  52. P. Liu, S. P. Sah, J. Jung, P. Upadhyaya, D. Heo, “Load Independent Bulk-Coupled Low Power Quadrature LC VCO”, International Microwave Symposium 2012, Montreal, pp. 1-3, June 2012.
  53. A. O. Mikul, S. Zhu, P. Sun, Y. You, S. P. Sah, D. Heo, “Low Phase Imbalance Broadband Attenuator based on SiGe PIN Diode”, International Microwave Symposium 2012, Montreal,  pp. 1-3, June 2012.
  54. Deb, S.; Chang, K.; Ganguly, A.; Xinmin Yu; Teuscher, C.; Pande, P.; Deukhyoun Heo; Belzer, B.; , “Design of an efficient NoC architecture using millimeter-wave wireless links,”Quality Electronic Design (ISQED), 2012 13th International Symposium on , vol., no., pp.165-172, 19-21 March 2012
  55. X. Yu, S. P. Sah, S. Deb, P. P. Pande, B. Belzer, D. Heo, “A Wideband Body-Enabled Millimeter-Wave Transceiver for Wireless Network-on-Chip” IEEE MWSCAS 2011,pp.1-4
  56. X. Yu, S. P. Sah, D. Heo, “A 750 MHz – 1 GHz Low-Power Transceiver for Wireless Sensor Applications”, CSSCIT 2011
  57. J. Jung, P. Upadyaya, P. Liu, D. Heo, “ Compact sub-1mW low phase noise CMOS LC-VCO based on power reduction technique,” IEEE MTT-S International Microwave Symposium Digest (MTT), pp. 1-4,  2011
  58. P. Liu, P. Upadhyaya, J. Jung, T. Luo, Y. J. Chen, D. Heo, “Low phase noise load independent switched LC VCO,” IEEE MTT-S International Microwave Symposium Digest (MTT),  pp. 280-283, 2010.
  59. Deukhyoun Heo, K. F. Warnick, “Integrated eight element Ku band transmit/receive beamformer chipset for low-cost commercial phased array antennas,” IEEE International Symposium on Phased Array Systems and Technology (ARRAY), pp. 653-659, 2010.
  60. Xinmin Yu, S. P. Sah, B. Belzer, D. Heo, “Performance evaluation and receiver front-end design for on-chip millimeter-wave wireless interconnect,” International Green Computing Conference, pp. 555-560, 2010.
  61. Pinping Sun, Peng Liu, P. Upadhyaya, DongHo Jeong, Deukhyoun Heo, E. Mina, “Silicon-based PIN SPST RF switches for improved linearity,” IEEE MTT-S International Microwave Symposium Digest (MTT), pp. 948-951, 2010
  62. J. Jung, S. Zhu, P. Liu, L. Wang, T. Luo, Y. Chen, D. Heo, “Energy efficient 136 Mb/s OOK implantable transmitter for wireless brain computer interface,” IEEE MTT-S International Microwave Symposium Digest (MTT), 1604 – 1607, 2010.
  63. J. Asmussen, S. P. Sah, Yu Xinmin, D. Heo, “A wideband body biased low-noise amplifier,”  International Conference on Green Circuits and Systems (ICGCS), pp. 687-690,  2010
  64. Jaeyoung Jung, Siqi Zhu, Peng Liu, Le Wang, Tang-Nian Luo, Yi-Jan Chen, Deukhyoun Heo, “Energy efficient 136 Mb/s OOK implantable transmitter for wireless brain computer interface,” IEEE MTT-S International Microwave Symposium Digest (MTT), pp. 1604-1607, 2010.
  65. Pinping Sun, Jaeyoung Jung, Youngsik Kim, Deukhyoun Heo, “An Ultra Low Power Analog  Frequency Divider,” in the proceedings of IEEE MTT-S Int’l Microwave Symposium, pp. 1489 ~ 1492, June 2008.
  66. Yang Zhang, Peng Liu, Tang-Nian Luo, Yi-Jan Emery Chen, Deukhyoun Heo, “A Low-Voltage Low-Phase Noise Bottom-Series LC QVCO using Capacitor Tapping Technique,” in the proceedings of IEEE MTT-S Int’l Microwave Symposium, pp. 237 ~ 240, June 2008.
  67. Tang-Nian Luo, Yi-Jan Emery Chen, Deukhyoun Heo, “A V-band Wide Locking Range CMOS Frequency Divider,” in the proceedings of IEEE MTT-S Int’l Microwave Symposium, pp. 563 ~ 566, June 2008
  68. Yang Zhang, Peng Liu, Tang-Nian Luo, Yi-Jan Emery Chen, Deukhyoun Heo, “A Low-Phase-Noise LC QVCO with Bottom-Series Coupling and Capacitor Tapping,” in the proceedings of IEEE International Symposium on Circuits and Systems, pp. 1000 ~ 1003, May 2008.
  69. P. Upadhyaya, D. Heo, Y. E. Chen, “A 1.1V Low Phase Noise CMOS Quadrature LC VCO with 4-Way Center-tapped Inductor,” in the proceedings of IEEE MTT-S Int’l Microwave Symposium, pp. 847-850,  June 2007.
  70. P. Upadhyaya, D. Heo, “A Novel Low Voltage and Low Power 0.18-µm Inductor-less CMOS Even-Harmonic Mixer,” in the proceedings of European Microwave Conference, pp. 1606-1609, Sept. 2006.
  71. Parag Upadhyaya, Deukhyoun Heo, Yi-Jan Emery Chen, “A 1.3V Low Phase Noise 2-GHz CMOS Quadrature LC VCO,” in the proceedings of European Microwave Integrated Circuits Conference, pp. 169-172, Sept. 2006.
  72. P. Sun, P. Upadhyaya, D. Heo, Y. E. Chen, “High Performance PIN Diode in 0.18um SiGe BiCMOS Process for Broadband Monolithic Control Circuits,” in the proceedings of European Microwave Integrated Circuit Conference, pp. 149-152, Sept. 2006.
  73. Yi-Jan Emery Chen, Shuen-Yin Bai, Tang-Nian Luo, Yueh-Hua Yu, Deukhyoun Heo, “A Wide Operation Range CMOS Frequency Divider for 60GHz Dual-Conversion Receiver,” in the proceedings of  2006 IEEE International RFIC Symposium, pp. 4, June 2006.
  74. Le Wang, Parag Upadhyaya, Pinping Sun, Deukhyoun Heo, “A 5.3GHz Low-Phase-Noise LC VCO With Harmonic Filtering Resistor,” in the proceedings of 2006 IEEE International Symposium on Circuits and Systems, pp. 4, May 2006.
  75. M. Rajashekharaiah, P. Upadhyaya, Deukhyoun  Heo, “Enhanced Gm3 cancellation for linearity improvement in CMOS LNA,” in the proceedings of IEEE International Symposium on Circuits and Systems, pp. 4240-4243, May 2006.
  76. Tang Nian Luo, Shuen Yin Bai, Yi Jan Chen, Hsin Shu Chen, Deukhyoun Heo, “A 1-V CMOS VCO For 60-GHz Applications,” in the proceedings of 2005 Asia Pacific Microwave Conference (APMC2005), Suzhou, China, December 2005.
  77. P. Upadhyaya, M. Rajashekharaiah, D. Heo, D. Rector, Y. E. Chen, “Low Power and Low Phase Noise 5.7 GHz LC VCO in OOK Transmitter for Neurosensory Application,” in the proceedings of  IEEE MTT-S International Microwave Symposium, pp. 1539-1542, June 2005.
  78. P. Upadhyaya, M. Rajashekharaiah, D. Heo, Y. E. Chen, “A High IIP2 Doubly Balanced Sub-Harmonic Mixer in 0.25-m CMOS for 5-GHz ISM Band Direct Conversion Receiver,” in the proceedings of IEEE International RFIC Symposium, pp. 175-178, June 2005. 
  79. Chih-Yun Liu   Yi-Jan Emery Chen   Deukhyoun Heo, “Impact of Bias Schemes on Doherty Power Amplifiers,” in the proceedings of IEEE International Symposium on Circuits and Systems, vol. 1, pp. 212-215, May 2005. 
  80. M. Rajashekharaiah, P. Upadhyaya, D.Heo, Y. E. Chen, “A 5GHz New Gain Controllable On-Chip Active Balun for ISM Band Applications,” in the proceedings of IEEE International Symposium on Circuits and Systems, vol. 5, pp. 5115-5118, May 2005. 
  81. P. Upadhyaya, M. Rajashekharaiah, Y. Zhang, D. Heo, Y. E. Chen, “A 5 GHz Novel 0.18-um Inductor-less CMOS Sub-Harmonic Mixer,” in the proceedings of International  Symposium on Information Processing in Sensor Networks, pp. 71-74, April 2005. 
  82. P. Sun, L. Wang, P. Upadhyaya, D. Heo, “High Isolation 10 GHz to 20 GHz SPDT Switch Design using Novel Octagonal PIN Diode Structure,” in the proceedings of IEEE Workshop on Microelectronics and Electron Devices, pp. 38-41, April 2005. 
  83. P. Upadhyaya, M. Rajashekharaiah, D. Heo, D. Rector, Y. E. Chen, “100 Mbps OOK Transmitter with Low Power and Low Phase Noise LC VCO for Neurosensory Application,” in the proceedings of IEEE Southeast Con., pp. 75-78, April 2005. 
  84. Le Wang, Pinping Sun, Mallesh Rajashekharaiah, Deukhyoun Heo, C.L.Champion, G.S.Larue, “A 15-GHz Single-Pole Double-Throw Annular MOSFET Switch for space application,” in the proceedings of IEEE Workshop on Microelectronics and Electron Devices, pp.103-106, April 2005. 
  85. M. Rajashekharaiah, P. Upadhyaya, D.Heo, Y. E. Chen, “A New 0.25um CMOS on-chip Active Balun with Gain Controllability for 5GHz DCR,” in the proceedings of IEEE Southeast Con, pp. 71-74, April 2005. 
  86. Yi-Jan Emery Chen, Kai-Hong Wang, Tang-Nian Luo, Shuen-Yin Bai, Deukhyoun Heo, “Investigation of CMOS technology for 60-GHz applications,” in the proceedings of IEEE Southeast Con, pp. 92-95, April 2005. 
  87. P. Upadhyaya, M. Rajashekharaiah, D. Heo, Y. E. Chen, “A New 5-GHz ISM Band CMOS Doubly Balanced Sub-Harmonic Mixer for Direct Conversion Receiver,” in the proceedings of IEEE European Conference on Wireless Technology, pp. 65-68, October 2004. 
  88. M. Rajashekharaiah, P. Upadhyaya, D.Heo, Y. E. Chen, “A 5GHz LNA with New Gain Controllable On-Chip Active Balun for ISM Band Applications,” in the proceedings of International Conference on Solid-State and Integrated Circuits Technology, vol. 2, pp. 1252-1255, October 2004. 
  89. P. Upadhyaya, M. Rajashekharaiah, D. Heo, Y. E. Chen, “A New 0.25-µm CMOS Doubly Balanced Sub-Harmonic Mixer for 5-GHz ISM Band Direct Conversion Receiver,” in the proceedings of International Conference on Solid-State and Integrated Circuits Technology, vol. 2, pp. 1295-1298, October 2004
  90. N. Srirattana,  D. Heo, M.-H. Park, A. Raghavan, P. E. Allen, and J. Laskar,  “A New Analytical Scalable Substrate Network Model for RF MOSFETs,” in the proceedings of IEEE MTT-S Int. Microwave Symposium, vol. 2, pp. 699-702, Dallas, TX., June 2004.
  91. M. Rajashekharaiah, P. Upadhyaya, D. Heo, “A compact 5.6 GHz low noise amplifier with new on-chip gain controllable active balun,” in the proceedings of IEEE Workshop on Microelectronics and Electron Devices, pp.131-132, April 2004. 
  92. P. Upadhyaya, M. Rajashekharaiah, D. Heo, “A 5.6GHz CMOS Doubly Balanced Sub-Harmonic Mixer for Direct Conversion Receiver,” in the proceedings of IEEE Workshop on Microelectronics and Electron Devices, pp.129-130, April 2004.