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Ka-Fai Un

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Ka-Fai Un
阮家煇 Ka-Fai Un
Assistant Professor
Phone: (+853)8822-4450
Room Number: N21-3006c

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

  1. Ka-Fai Un, Scientific and Technological R&D Award (PhD Student), Macau Science and Technology Award 2012

    FDCT

     Oct-2012
  2. 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

     Dec-2009
  1. 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

    Granted Number: 9,276,798

    US Patent

     Mar-2016
  2. Ka-Fai Un, Pui In Mak, R. P. Martins, Wideband Driver Amplifier

    Granted Number: 9,172,337

    Application Number: 14/073,014

    US Patent

     Oct-2015
  3. Ka-Fai Un, Pui In Mak, R. P. Martins, Poly-Phase Local Oscillator

    Granted Number: 9,093,951

    Application number: 14/073,060

    US Patent Application

     Jul-2015
  4. Ka-Fai Un, Pui In Mak, R. P. Martins, Wireless Transmitter

    Granted Number: 9,037,100

    Application Number: 14/073,082

    US Patent

     May-2015
  1. Zhongyu Zhao, Rujian Cao, Ka-Fai Un, Wei-Han Yu, Pui-In Mak and Rui P. Martins, An FPGA-Based Transformer Accelerator Using Output Block Stationary Dataflow for Object Recognition Applications

    IEEE Transactions on Circuits and Systems II: Express Briefs

     vol. 70, no. 1, pp. 281-285 Jan-2023
  2. Rui P. Martins; Pui-In Mak; Sai-Weng Sin; Man-Kay Law; Yan Zhu; Yan Lu; Jun Yin; Chi-Hang Chan; Yong Chen; Ka-Fai Un; Mo Huang; Minglei Zhang; Yang Jiang; Wei-Han Yu, Revisiting the Frontiers of Analog and Mixed-Signal Integrated Circuits Architectures and Techniques towards the future Internet of Everything (IoE) Applications

    Foundations and Trends in Integrated Circuits and Systems

     Volume 1, Issue 2-3 Nov-2021
  3. Jixuan Li; Ka-Fai Un; Wei-Han Yu; Pui-In Mak; Rui P. Martins, An FPGA-Based Energy-Efficient Reconfigurable Convolutional Neural Network Accelerator for Object Recognition Applications

    IEEE Transactions on Circuits and Systems II: Express Briefs

     vol. 68, no. 9, pp. 3143-3147 Sep-2021
  4. 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

     vol. 67, pp. 37–41 Jan-2020
  5. 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

     vol. 8, no. 2, pp. 165-177 Jun-2018
  6. Wei-Han Yu, Ka-Fai Un, Pui In Mak, R. P. Martins, A 0.7-to-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

     vol.65, No.1, pp.14-25 Jan-2018
  7. 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

     vol. 63, pp. 3228-3241 Oct-2015
  8. 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

     vol. 62, pp. 1025-1032 Apr-2015
  9. 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

     Vol.48, Issue 9, pp 2078-2089 Aug-2013
  10. 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

     Vol. 60, No. 8, pp. 462-466 Aug-2013
  11. 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

     vol. 57, Issue 5, pp. 970-987 May-2010
  1. Jinhai Lin, Ka-Fai Un, Wei-Han Yu, Pui-In Mak and Rui P. Martins, A 47nW Mixed-Signal Voice Activity Detector (VAD) Featuring a Non-Volatile Capacitor-ROM, a Short-Time CNN Feature Extractor and an RNN Classifier

    2023 IEEE International Solid-State Circuits Conference (ISSCC)

     Feb-2023
  2. Feifei Chen, Ka-Fai Un, Wei-Han Yu, Pui-In Mak, Rui P. Martins, A 108nW 0.8mm2 Analog Voice Activity Detector (VAD) Featuring a Time-Domain CNN as a Programmable Feature Extractor and a Sparsity-Aware Computational Scheme in 28nm CMOS

    IEEE International Solid-State Circuits Conference (ISSCC)

     Feb-2022
  3. Jixuan Li, Jiabao Chen, Ka-Fai Un, Wei-Han Yu, Pui-In Mak, Rui P. Martins, A 50.4 GOPs/W FPGA-Based MobileNetV2 Accelerator using the Double-Layer MAC and DSP Efficiency Enhancement

    2021 IEEE Asian Solid-State Circuits Conference (A-SSCC)

    IEEE ASSCC 2021, Session 7/ paper 7.3

     Nov-2021
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. GengZhen Qi, Ka-Fai Un, Wei-Han Yu, Pui In Mak, Rui P. Martins, A wideband multi-stage inverter-based driver amplifier for IEEE 802.22 WRAN transmitters

    pp.6-9

     Aug-2013
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