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Prof. YAN Xu (闫旭)

B.S.(NUAA), M.Eng(USTC), Ph.D.(NUS)
MIEEE

Visiting Assistant Professor, EE Department, CityUHK

特聘副研究员，香港城市大学深圳研究院

Contact Information

Office: 2381 FYW
Phone: 95136372
Email: yanxe.ee@cityu.edu.hk
Web: CityU Scholars

Research Interests

  • CMOS/III-V-based transceiver and building block RF/MMIC
  • Micro-system integration
  • Cryogenic ICs for Quantum
  • AI-powered IC design automation algorithms.
Dr. YAN Xu received the B.S. degree in electronic information engineering (with the highest honor) from Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 2016, the M.Eng. degree in electronics engineering from the University of Science and Technology of China, Hefei, China, in 2019, and Ph.D. degree in RF/MMIC Design from the National University of Singapore, Singapore, in 2023. Before joining CityUHK, he was an assistant director of Anhui Transilica Microelectronics Co. Ltd. (ATM) from 2017 to 2018 and a research fellow and MMIC design team leader at the Department of Electrical and Computer Engineering, National University of Singapore from 2023 to 2024. Prof. YAN has engaged more than 10 times in tape-out on GaAs/GaN/CMOS/CMOS RF-SOI processes and authored or co-authored more than 40 peer-reviewed papers and 5 patents.


Awards and Achievements

  • Apr 2023 “2023 Highlight Paper Award” IEEE Transactions on Circuits and Systems-I: Regular Papers.
  • Nov 2024 “Best Student Paper Award” IEEE Asia-Pacific Microwave Conference (APMC). Act as the tutor and corresponding author. [URL]
  • Aug 2024 “Best Student Paper Award” IEEE International Symposium on Radio-Frequency Integration Technology. Act as the tutor and corresponding author. [URL]


Previous Experience

  • Aug 2023 - Nov 2024, Research Fellow and RF/MMIC Design Team Leader, Department of Electrical and Computer Engineering, National University of Singapore.


Research Grants

  • 基于空间映射技术的宽带氮化镓功放芯片板图优化算法研究, 射频异质结集成全国重点实验室公开项目, 射频异质结集成全国重点实验室, Amount: CNY $150,000, Dec 2024 - Nov 2026, YAN Xu (PI).
  • GaN-based MMICs for 5G applications, NUSRI (Suzhou) Basic Research Project, NUSRI (Suzhou), Amount: CNY $3,500,000, Jan 2022 - Dec 2024, GUO Yongxin (PI), YAN Xu (Co-I).
  • Wearable SIL Radar-based Pulse Waveform Detection, Research Collaboration Project between NUS and HUAWEI, HUAWEI (SG), Amount: SGD $200,000, Jan 2021 - Dec 2023, GUO Yongxin (PI), YAN Xu (Co-I).
  • Wideband MMICs with GaAs pHEMT process, NUSRI (Suzhou) Basic Research Project, NUSRI (Suzhou) , Amount: CNY $2,000,000, Jan 2021 - Dec 2023, GUO Yongxin (PI), YAN Xu (Co-I).
  • 3D City Model Enabled Urban Canyon Mapping for Multi-constellation GNSS, National Research Foundation (NRF) of Singapore, Amount: SGD $338,400, Jan 2018 - Jan 2021, GUO Yongxin (PI), YAN Xu (Co-I).
  • Integration of Electrically Driven Plasmonic Components in High-Speed Electronics, National Research Foundation (NRF) of Singapore, Amount: SGD $7,500,000, Jun 2017 - May 2023, GUO Yongxin (PI), YAN Xu (Co-I).


Patents

  • H. Zhang, X. Yan, J. Shi, and F. Lin, A wideband LNA with partial active negative and positive feedback, China Patent No. ZL202010046767.2, 2022.
  • J. Zhang, J. Yang, X. Yan, and F. Lin, A VCO with temperature compensations, China Patent No. ZL201711126350.2, 2021, 2021.
  • X. Yan, H. Zhang, J. Shi, and F. Lin, A Wideband LNA with active inductive feedback, China Patent No. ZL201810883027.8, 2020.
  • X. Yan, L. Yang, J. Zhang, and F. Lin, A wideband low power RF mixer, China Patent No. ZL201710070757.1, 2019.
  • X. Yan, L. Yang, J. Zhang, and F. Lin, An RF wireless receiver front-end with digitally assisted techniques, China Patent No. ZL201710506929.5, 2019.


Publications Show All Publications Show Prominent Publications


Journal

  • Xu, Yan. , Jingyuan, Zhang. , Baoguo, Yang. , Siping, Gao. & Yongxin, Guo. (Dec 2024). Compact reconfigurable dual-band MMIC SPDT/SP4T switches with on-chip coupled-Line structure in GaN-on-SiC HEMT technology. IEEE Transactions on Circuits and Systems I: Regular Papers. Early Access. doi:10.1109/TCSI.2024.3504273
  • Hanjun, Zhao. , Xu, Yan*. , Hui, Chu. , Xiaohua, Zhu. & Yongxin, Guo. (Nov 2024). A 360 tunable phase shifter with low phase error based on bandpass networks in 0.25-μm GaN technology. IEEE Transactions on Very Large Scale Integration (VLSI) Systems. Early Access. doi:10.1109/TVLSI.2024.3489355
  • Hanjun, Zhao. , Xu, Yan*. , Hui, Chu. , Xiaohua, Zhu. & Yongxin, Guo. (Nov 2024). A 4.5–5.5-GHz compact 6-bit phase shifter with low RMS phase and amplitude errors based on bandpass structure for high-power applications. IEEE Transactions on Microwave Theory and Techniques. Early Access. doi:10.1109/TMTT.2024.3485203
  • Jingyuan, Zhang. , Weichen, Zhao. , Baoguo, Yang. , Xu, Yan*. & Yongxin, Guo. (Nov 2024). Design and analysis of a coupled-line-based load-modulated balanced amplifier MMIC with enhanced bandwidth performance. IEEE Transactions on Circuits and Systems I: Regular Papers. 72(1). 111 - 124. doi:10.1109/TCSI.2024.3489555
  • Xu, Yan. , Jingyuan, Zhang. , Guansheng, Lv. , Wenhua, Chen. & Yongxin, Guo. (Aug 2024). Gain and power enhancement with coupled technique for a distributed power amplifier in 0.25-μm GaN HEMT technology. IEEE Transactions on Very Large Scale Integration (VLSI) Systems. 32(8). 1523 - 1534. doi:10.1109/TVLSI.2024.3411143
  • Jingyuan, Zhang. , Renlong, Han. , Falin, Liu. , Xu, Yan*. & Yongxin, Guo. (Jul 2024). Design of a fully integrated wideband GaN continuous-mode asymmetrical Doherty power amplifier in GaN-on-SiC HEMT technology. IEEE Transactions on Circuits and Systems II: Express Briefs. 71(12). 4879 - 4883. doi:10.1109/TCSII.2024.3434572
  • Jingyuan, Zhang. , Xu, Yan*. , Haorui, Luo. & Yongxin, Guo. (May 2024). An efficient transistor-model-assisted layout synthesis approach using improved implicit space mapping for high-performance MMIC PAs. IEEE Transactions on Circuits and Systems II: Express Briefs. 71(5). 2639 - 2643. doi:10.1109/tcsii.2024.3352187
  • Xu, Yan. , Jingyuan, Zhang. , Siping, Gao. & Yongxin, Guo. (Mar 2024). Beyond the bandwidth limit: A tutorial on low-noise amplifier circuits for advanced systems based on III-V process. IEEE Transactions on Circuits and Systems II: Express Briefs. 71(3). 1644 - 1649. doi:10.1109/tcsii.2023.3338812
  • Xu, Yan. , Haorui, Luo. , Jingyuan, Zhang. , Siping, Gao. & Yongxin, Guo. (Apr 2023). A 9-to-42 GHz high-gain low-noise amplifier using coupled interstage feedback in 0.15-μm GaAs pHEMT technology. IEEE Transactions on Circuits and Systems I: Regular Papers. 70(4). 1476 - 1488. doi:10.1109/tcsi.2023.3238391
  • Xu, Yan. , Jingyuan, Zhang. , Haorui, Luo. , Siping, Gao. & Yongxin, Guo. (Apr 2023). A compact 1.0-12.5 GHz LNA MMIC with 1.5-dB NF based on multiple resistive feedback in 0.15-μm GaAs pHEMT technology. IEEE Transactions on Circuits and Systems I: Regular Papers. 70(04). 1450 - 1462. doi:10.1109/tcsi.2023.3238361
  • Xu, Yan. , Pengyu, Yu. , Jingyuan, Zhang. , Siping, Gao. & Yongxin, Guo. (Dec 2022). A broadband 10-43-GHz high-gain LNA MMIC using coupled-line feedback in 0.15-μm GaAs pHEMT technology. IEEE Microwave and Wireless Components Letters. 32(12). 1459 - 1462. doi:10.1109/lmwc.2022.3193007
  • Xu, Yan. , Haorui, Luo. , Jingyuan, Zhang. , Hao, Zhang. & Yongxin, Guo. (Dec 2022). Design and analysis of a cascode distributed LNA with gain and noise improvement in 0.15-μm GaAs pHEMT technology. IEEE Transactions on Circuits and Systems II: Express Briefs. 69(12). 4659 - 4663. doi:10.1109/tcsii.2022.3196817
  • Xu, Yan. , Yu, Li. , Yang, Chen. , Hao, Zhang. , Liguo, Sun. & Fujiang, Lin. (Sep 2019). A LNA-merged RF front-end with digitally assisted technique for gain flatness and input-match compensation. Analog Integrated Circuits and Signal Processing. 101(2). 219 - 228. doi:10.1007/s10470-019-01539-2
  • Xu, Yan. , Cen, Chen. , Lu, Yang. , Jili, Zhang. & Fujiang, Lin. (Nov 2017). A 0.1-1.1 GHz inductorless differential LNA with double gm-boosting and positive feedback. Analog Integrated Circuits and Signal Processing. 93(2). 205 - 215. doi:10.1007/s10470-017-1043-y

Conference Paper

  • Xu, Yan. , Jingyuan, Zhang. & Yongxin, Guo. (Nov 2024). A compact wideband GaN fully distributed efficient power amplifier. 2024 IEEE Asia-Pacific Microwave Conference (APMC). Bali. Indonesia: University of Indonesia.
  • Jingyuan, Zhang. , Xu, Yan*. & Yongxin, Guo. (Nov 2024). A fully-integrated GaN coupled-line-based load-modulated balanced amplifier (Best Student Paper Award). 2024 IEEE Asia-Pacific Microwave Conference (APMC). Bali. Indonesia: University of Indonesia.
  • Xu, Yan. , Jingyuan, Zhang. & Yongxin, Guo. (Nov 2024). Ultra-wideband GaN distributed PA MMIC design with coupled technique (Invited). IEEE 10th International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE). Guangzhou. China: South China University of Technology.
  • Xu, Yan. , Jingyuan, Zhang. , Siping, Gao. & Yongxin, Guo. (Aug 2024). A compact GaN dual-band SPDT switch with coupled technique (Invited). 2024 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT). Chengdu. China: University of Electronic Science and Technology of China. doi:10.1109/RFIT60557.2024.10812436
  • Jingyuan, Zhang. , Hao, Zhang. , Han, Wang. , Xu, Yan*. & Yongxin, Guo. (Aug 2024). A high-power-density synchronous GaN class-F rectifier MMIC for on-chip MWPT micro-system (Best Student Paper Award). 2024 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT). Chengdu. China: University of Electronic Science and Technology of China. doi:10.1109/RFIT60557.2024.10812511
  • Xu, Yan. , Jingyuan, Zhang. , Siping, Gao. & Yongxin, Guo. (May 2024). A compact filtering power divider with wideband harmonic-suppressed ability (MVC Contest Short-List)). 2024 IEEE MTT-S International Wireless Symposium (IWS). Beijing. China: Beijing Institute of Technology. doi:10.1109/IWS61525.2024.10713774
  • Jie, Shi. , Xiaohu, Fang. , Xinyu, Zhou. , Xu, Yan*. , Wei, Lin. & Luyu, Zhou. (May 2024). A GaN MMIC Inverse Class-F Power Amplifier Using Co-Designed Bias Network and LC Resonator (Invited). 2024 15th Global Symposium on Millimeter-Waves & Terahertz (GSMM). Hong Kong. China: City University of Hong Kong. doi:10.1109/GSMM61775.2024.10553095
  • Xu, Yan. , Jingyuan, Zhang. , Siping, Gao. & Yongxin, Guo. (Nov 2023). High-performance wideband LNA MMICs based on GaAs pHEMT process (Invited). 2023 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP). Chengdu. China: University of Electronic Science and Technology of China.
  • Xu, Yan. , Jingyuan, Zhang. & Yongxin, Guo. (Aug 2021). A 2–18 GHz 13.5-W distributed GaN HPA MMIC based on stacked and tapering techniques. 2021 IEEE MTT-S International Wireless Symposium (IWS). Nanjing. China: Southeast University. doi:10.1109/IWS52775.2021.9499505
  • Xu, Yan. , Jingyuan, Zhang. , Wenrui, Hu. , Haorui, Luo. & Yongxin, Guo. (Feb 2021). An 11-W Ka-band GaN HPA MMIC based on self-developed empirical model. 2020 IEEE Asia-Pacific Microwave Conference (APMC). Hong Kong. China: City University of Hong Kong. doi:10.1109/APMC47863.2020.9331680


External Services


Professional Activity

  • 23 Jul 2025 - 25 Jul 2025, Publicity Chair, 2025 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP).China.
  • 17 Nov 2024 - 20 Nov 2024, Session Chair, 2024 IEEE Asia-Pacific Microwave Conference.Indonesia.
  • 8 Nov 2024 - 11 Nov 2024, Session Chair, 2024 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications.China.
  • 28 Aug 2024 - 30 Aug 2024, Session Chair, 2024 IEEE International Symposium on Radio-Frequency Integration Technology.China.
  • 20 May 2024 - 22 May 2024, Session Chair, The 15th Global Symposium on Millimeter-Waves & Terahertz.Hong Kong SAR.
  • 12 Nov 2023 - 15 Nov 2023, Session Chair, 2023 IEEE MTT-S International Microwave Workshop Series onAdvanced Materials and Processes for RF and THz Applications.China.
  • 2021 - 2024, TPC Member, IEEE International Symposium on Circuits and Systems.

Community Service

  • 2025 - Now, Guest Editor, Electronics.
  • 2025 - Now, Reviewer, IEEE Transactions on Microwave Theory and Techniques.
  • 2025 - Now, Reviewer, IEEE Transactions on Intelligent Transportation Systems.
  • 2025 - Now, Reviewer, Journal of Electromagnetic Waves and Applications.
  • 2025 - Now, Reviewer, IEEE Transactions on Very Large Scale Integration (VLSI) Systems.
  • 2025 - Now, Reviewer, Sensors.
  • 2024 - Now, Reviewer, IET Microwaves, Antennas and Propagation.
  • 2024 - Now, Reviewer, Microwave and Optical Technology Letters.
  • 2023 - Now, Reviewer, IEEE Transactions on Circuits and Systems II: Express Briefs.
  • 2023 - Now, Reviewer, IEEE Microwave and Wireless Technology Letters.
  • 2020 - Now, Reviewer, Analog Integrated Circuits and Signal Processing.
  • 2019 - 2023, Reviewer, IEEE Microwave and Wireless Components Letters.
  • 2018 - Now, Reviewer, IET Circuits, Devices and Systems.
  • 2015 - Now, Member, IEEE (CAS, SSC, and MTT Societies).


Last update date : 20 Feb 2025