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: 8
  1. 8. Ka-Fai Un, Feifei Zhang, Pui In Mak, R. P. Martins, Anding Zhu, Robert Bogdan Staszewski, "Design Considerations of the Interpolative Digital Transmitter for Quantization Noise and Replicas Rejection", IEEE Transactions on Circuits and Systems – II, Jan-2020.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. 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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