Ka-Fai Un

Publication Activity (10 Years)

Years Active: 2008-2024
Publications (10 Years): 18

Top Topics

Keyword Spotting

Analog To Digital Converter

Feature Extractor

Image Recognition

Top Venues

IEEE Trans. Circuits Syst. II Express Briefs

IEEE Trans. Circuits Syst. I Regul. Pap.

IEEE J. Solid State Circuits

Publications

Yaozhong Ou, Wei-Han Yu, Ka-Fai Un, Chi-Hang Chan, Yan Zhu
A 119.64 GOPs/W FPGA-Based ResNet50 Mixed-Precision Accelerator Using the Dynamic DSP Packing. IEEE Trans. Circuits Syst. II Express Briefs 71 (5) (2024)
Fei Tan, Wei-Han Yu, Ka-Fai Un, Rui Paulo Martins, Pui-In Mak
2.91-nJ/Decision Keyword-Spotting (KWS) Chip Featuring an Always-Retention 5T-SRAM in 28-nm CMOS. IEEE J. Solid State Circuits 59 (2) (2024)
Fei Tan, Wei-Han Yu, Jinhai Lin, Ka-Fai Un, Rui Paulo Martins, Pui-In Mak
17.9 A 1.8% FAR, 2ms Decision Latency, 1.73nJ/Decision Keywords Spotting (KWS) Chip Incorporating Transfer-Computing Speaker Verification, Hybrid-Domain Computing and Scalable 5T-SRAM. ISSCC (2024)
Ran Zhang, Ka-Fai Un, Mingqiang Guo, Liang Qi, Dengke Xu, Weibing Zhao, Rui Paulo Martins, Franco Maloberti, Sai-Weng Sin
A Delta-Sigma-Based Computing-In-Memory Macro Targeting Edge Computation. ISCAS (2024)
Jinhai Lin, Ka-Fai Un, Wei-Han Yu, Pui-In Mak, Rui Paulo 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. ISSCC (2023)
Zhongyu Zhao, Rujian Cao, Ka-Fai Un, Wei-Han Yu, Pui-In Mak, Rui Paulo Martins
An FPGA-Based Transformer Accelerator Using Output Block Stationary Dataflow for Object Recognition Applications. IEEE Trans. Circuits Syst. II Express Briefs 70 (1) (2023)
Jinhai Lin, Ka-Fai Un, Wei-Han Yu, Rui Paulo Martins, Pui-In Mak
A 47-nW Voice Activity Detector (VAD) Featuring a Short-Time CNN Feature Extractor and an RNN-Based Classifier With a Non-Volatile CAP-ROM. IEEE J. Solid State Circuits 58 (11) (2023)
Feifei Chen, Ka-Fai Un, Wei-Han Yu, Pui-In Mak, Rui Paulo Martins
Design and Implementation of a Low Power Switched-Capacitor-Based Analog Feature Extractor for Voice Keyword Spotting. APCCAS (2022)
Feifei Chen, Ka-Fai Un, Wei-Han Yu, Pui-In Mak, Rui Paulo Martins
Analog Voice Activity Detector Featuring a Time-Domain CNN With Sparsity-Aware Computation and Sparsified Quantization in 28-nm CMOS. IEEE J. Solid State Circuits 57 (11) (2022)
Lei Xuan, Ka-Fai Un, Chi-Seng Lam, Rui Paulo Martins
An FPGA-Based Energy-Efficient Reconfigurable Depthwise Separable Convolution Accelerator for Image Recognition. IEEE Trans. Circuits Syst. II Express Briefs 69 (10) (2022)
Feifei Chen, Ka-Fai Un, Wei-Han Yu, Pui-In Mak, Rui Paulo Martins
Analog Voice Activity Detector (VAD) Featuring a Time-Domain CNN as a Programmable Feature Extractor and a Sparsity-Aware Computational Scheme in 28nm CMOS. ISSCC (2022)
Jixuan Li, Ka-Fai Un, Wei-Han Yu, Pui-In Mak, Rui Paulo Martins
An FPGA-Based Energy-Efficient Reconfigurable Convolutional Neural Network Accelerator for Object Recognition Applications. IEEE Trans. Circuits Syst. II Express Briefs 68 (9) (2021)
Jixuan Li, Jiabao Chen, Ka-Fai Un, Wei-Han Yu, Pui-In Mak, Rui Paulo Martins
A 50.4 GOPs/W FPGA-Based MobileNetV2 Accelerator using the Double-Layer MAC and DSP Efficiency Enhancement. A-SSCC (2021)
Ka-Fai Un, Feifei Zhang, Pui-In Mak, Rui Paulo Martins, Anding Zhu, Robert Bogdan Staszewski
Design Considerations of the Interpolative Digital Transmitter for Quantization Noise and Replicas Rejection. IEEE Trans. Circuits Syst. II Express Briefs (1) (2020)
Ka-Fai Un, Gengzhen Qi, Jun Yin, Shiheng Yang, Shupeng Yu, Chio-In Ieong, Pui-In Mak, Rui Paulo Martins
1.2-to-2.4-mW 1.3-to-2.65-GHz Fractional-N Bang-Bang Digital PLL With 8-µs Settling Time for Multi-ISM-Band ULP Radios. IEEE Trans. Circuits Syst. I Regul. Pap. (9) (2019)
Wei-Han Yu, Ka-Fai Un, Pui-In Mak, Rui Paulo 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-Interleaver. IEEE Trans. Circuits Syst. I Regul. Pap. (1) (2018)
Changzhi Li, Ka-Fai Un, Pui-In Mak, Ying Chen, José Maria Muñoz-Ferreras, Zhi Yang, Roberto Gómez-García
Overview of Recent Development on Wireless Sensing Circuits and Systems for Healthcare and Biomedical Applications. IEEE J. Emerg. Sel. Topics Circuits Syst. 8 (2) (2018)
Chak-Fong Cheang, Ka-Fai Un, Pui-In Mak, Rui Paulo Martins
Time-domain I/Q-LOFT compensator using a simple envelope detector for a sub-GHz IEEE 802.11af WLAN transmitter. ASP-DAC (2016)
Chak-Fong Cheang, Ka-Fai Un, Wei-Han Yu, Pui-In Mak, Rui Paulo Martins
A Combinatorial Impairment-Compensation Digital Predistorter for a Sub-GHz IEEE 802.11af-WLAN CMOS Transmitter Covering a 10x-Wide RF Bandwidth. IEEE Trans. Circuits Syst. I Regul. Pap. (4) (2015)
Ka-Fai Un, Pui-In Mak, Rui Paulo 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 J. Solid State Circuits 48 (9) (2013)
Wei-Han Yu, Chak-Fong Cheang, Pui-In Mak, Weng-Fai Cheng, Ka-Fai Un, U-Wai Lok, Rui Paulo Martins
A Nonrecursive Digital Calibration Technique for Joint Elimination of Transmitter and Receiver I/Q Imbalances With Minimized Add-On Hardware. IEEE Trans. Circuits Syst. II Express Briefs (8) (2013)
Weng-Fai Cheng, Ka-Fai Un, Pui-In Mak, Rui Paulo Martins
A highly-linear ultra-wideband balun-LNA for cognitive radios. EUROCON (2011)
Miguel A. Martins, Ka-Fai Un, Pui-In Mak, Rui Paulo Martins
SC biquad filter with hybrid utilization of OpAmp and comparator-based circuit. ISCAS (2010)
Ka-Fai Un, Pui-In Mak, Rui Paulo Martins
Analysis and Design of Open-Loop Multiphase Local-Oscillator Generator for Wireless Applications. IEEE Trans. Circuits Syst. I Regul. Pap. (5) (2010)
Ka-Fai Un, Pui-In Mak, Rui Paulo Martins
An Open-loop Octave-phase Local-oscillator Generator with High-precision Correlated Phases for VHF/UHF Mobile-TV Tuners. ISCAS (2009)
Ka-Fai Un, Pui-In Mak, Rui Paulo da Silva Martins
A DC-offset-compensated, CT/DT hybrid filter with process-insensitive cutoff and low in-band group-delay variation for WLAN receivers. APCCAS (2008)