Ka-Fai Un(Homepage)

Ka-Fai Un

阮家煇

Keith

Email:KAFAIUN

Phone:(+853) 8822-4450

Room Number:N21-3006

Assistant Professor

Academic Qualifications

  • Ph.D. in Electrical and Electronics Engineering, Faculty of Science and Technology, University of Macau, China (2014)
  • M.Sc. in Electrical and Electronics Engineering, Faculty of Science and Technology, University of Macau, China (2009)
  • B.Sc. in Electrical Engineering, National Taiwan University, Taiwan (2007)

Professional Experience

 

Institute of Microelectronics

  • Assistant Professor, State-Key Lab. of Analog and Mixed-Signal VLSI, University of Macau (Feb. 2019 – Present)

State-Key Laboratory of Analog and Mixed-Signal VLSI

  • Assistant Professor, State-Key Lab. of Analog and Mixed-Signal VLSI, University of Macau (Dec. 2018 – Feb. 2019)
  • Macao Fellow (Lecturer), State-Key Lab. of Analog and Mixed-Signal VLSI, University of Macau (Dec. 2015 – Dec. 2018)
  • Post-Doctoral Research Fellow, State-Key Lab. of Analog and Mixed-Signal VLSI, University of Macau (Aug. 2014 – Dec. 2015)

Others

  • Visiting Scholar, University College Dublin, Ireland (Jan. 2017 – Dec. 2018)

Research

Research Interests

  • RF, analog and mixed-signal CMOS integrated circuits
  • Artificial Intelligence Analog Computation

Teaching Experience

B.Sc. Courses

  • Circuit Analysis (ELEC231/ ECEB122)
  • Signals and Systems (ELEC261)
  • Telecommunications (ELEC361)

M.Sc. Courses

  • Microelectronic Circuit Design (IMSE004)

 

Theses Supervision

Iat Fai SUN          2019-Present       Analog Computation for Deep Learning

Feifei CHEN         2018-Present       Analog Computation for Speech Recognition

 

Professional Review Services

IEEE Transactions on Circuits and Systems I: Regular Papers

IEEE Transactions on Circuits and Systems II: Express Briefs

IEEE International Symposium on Circuits and Systems – ISCAS

IEEE Asia Symposium on Quality in Electronic Design – ASQED

IEEE Asia Pacific Conference on Circuits and Systems – APCCAS


AwardsTotal: 2
  1. 2. Ka-Fai Un, "Scientific and Technological R&D Award (PhD Student), Macau Science and Technology Award 2012", FDCT, Macau, Oct-2012
  2. 1. Ka-Fai Un, Pui In Mak, R. P. Martins, "Certificate of Merit (DC-Offset-Compensated, CT/DT Hybrid Filter with Process-Insensitive Cutoff and Low In-Band Group-Delay Variation for WLAN Receivers)", IEEE Asia-Pacific Conference on Circuits and Systems – APCCAS’2008, Macao, China., Dec-2009
Patents and Technology TransferTotal: 6
  1. 6. Wei-Han Yu, Chak Fong Cheang, Ka-Fai Un, Pui In Mak, R. P. Martins, "Non-recursive digital calibration for joint-elimination of transmitter and receiver I/Q imbalances with minimized add-on hardware", US Patent, , Granted Number:, Mar. 2016
  2. 5. Ka-Fai Un, Pui In Mak, R. P. Martins, "Wireless Transmitter", US Patent, Application Number: 14/073,082, May, 2015
  3. 4. Ka-Fai Un, Pui In Mak, R. P. Martins, "Wideband Driver Amplifier", US Patent, Application Number: 14/073,014, Oct, 2015
  4. 3. Ka-Fai Un, Pui In Mak, R. P. Martins, "Poly-Phase Local Oscillator", US Patent Application, Application number: 14/073,060, Jul, 2015
  5. 2. Wei-Han Yu, Chak-Fong Cheang, Ka-Fai Un, Pui In Mak, R. P. Martins, "Non-Recursive Digital Calibration for Joint-Elimination of Transmitter and Receiver I/Q Imbalances with Minimized Add on Hardware", US Patent, Application, No. 14/226,032, , Mar. 2014.
  6. 1. Ka-Fai Un, Pui In Mak, R. P. Martins, "Wideband Driver Amplifier", US Patent, Application Number: 14/073,014, Granted Number: 9,172,337, Oct, 2015
Journals and MagazinesTotal: 7
  1. 7. Changzhi Li, Ka-Fai Un, Pui In Mak, Ying Chen, José-María Muñoz-Ferreras, Zhi Yang, Roberto Gómez-García, "Overview of Recent Development on Wireless Sensing Circuits and Systems for Healthcare and Biomedical Applications", IEEE Journal on Emerging and Selected Topics in Circuits and Systems, Jun-2018.
  2. 6. Wei-Han Yu, Ka-Fai Un, Pui In Mak, R. P. Martins, "A 0.7–2.5 GHz, 61% EIRP System Efficiency, Four-Element MIMO TX System Exploiting Integrated Power-Relaxed Power Amplifiers and an Analog Spatial De-Interleave", IEEE Transactions on CAS – Part I: Regular Papers, Jan-2018.
  3. 5. Ka-Fai Un, Wei-Han Yu, Chak Fong Cheang, Gengzhen Qi, Pui In Mak, R. P. Martins, "A Sub-GHz Wireless Transmitter Utilizing a Multi-Class-Linearized PA and Time-Domain Wideband-Auto I/Q-LOFT Calibration for IEEE 802.11af WLAN", IEEE Transactions on Microwave Theory and Techniques, Oct-2015.
  4. 4. Chak Fong Cheang, Ka-Fai Un, Wei-Han Yu, Pui In Mak, R. P. Martins, "A Combinatorial Impairment-Compensation Digital Predistorter for a Sub-GHz IEEE 802.11af-WLAN CMOS Transmitter Covering a 10x-Wide RF Bandwidth", IEEE Transactions on Circuits and Systems – I, Apr-2015.
  5. 3. Ka-Fai Un, Pui In Mak, R. P. Martins, "A 53-to-75 mW, 59.3-dB HRR, TV-Band White-Space Transmitter Using a Low-Frequency Reference LO in 65-nm CMOS", IEEE Journal of Solid-State Circuits, Aug-2013.
  6. 2. Wei-Han Yu, Chak-Fong Cheang, Pui In Mak, Weng-Fai Cheng, Ka-Fai Un, U-Wai Lok, R. P. Martins, "A Nonrecursive Digital Calibration Technique for Joint Elimination of Transmitter and Receiver I/Q Imbalances With Minimized Add-On Hardware", IEEE Transactions on Circuits and Systems – II, Aug-2013.
  7. 1. Ka-Fai Un, Pui In Mak, R. P. Martins, "Analysis and Design of Open-Loop Multi-Phase Local-Oscillator Generator for Wireless Applications", IEEE Transactions on Circuits and Systems – I: Regular Papers, May-2010.
Conference Papers and PresentationsTotal: 5
  1. 5. Chak Fong Cheang, Ka-Fai Un, Pui In Mak, R. P. Martins, "Time-Domain I/Q-LOFT Compensator Using a Simple Envelope Detector for a Sub-GHz IEEE 802.11af WLAN Transmitte", Asia and South Pacific Design Automation Conference (ASP-DAC), , Jan-2016.
  2. 4. Weng-Fai Cheng, Ka-Fai Un, Pui In Mak, R. P. Martins, "A highly-linear ultra-wideband balun-LNA for cognitive radios", IEEE International Conference on Computer as a Tool and Conference on Telecommunications (EUROCON), pp. 1-4, Apr-2011.
  3. 3. Miguel A. Martins, Ka-Fai Un, Pui In Mak, R. P. Martins, "SC Biquad Filter with Hybrid Utilization of OpAmp and Comparator-Based Circuit", Proc. IEEE International Symposium on Circuits and Systems – ISCAS 2010, pp. 1276-1279, Jun-2010.
  4. 2. Ka-Fai Un, Pui In Mak, R. P. Martins, "An open-loop octave-phase local-oscillator generator with high-precision correlated phases for VHF/UHF mobile-TV tuners", Proc. IEEE International Symposium on Circuits and Systems – ISCAS 2009, pp. 433-436, May-2009.
  5. 1. Ka-Fai Un, Pui In Mak, R. P. Martins, "A DC-Offset-Compensated, CT/DT Hybrid Filter with Process-Insensitive Cutoff and Low In-Band Group-Delay Variation for WLAN Receivers", in Proc. of IEEE Asia Pacific Conference on Circuit and Systems (APCCAS), pp. 1360-1363, Dec-2008.



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