LIU,Xun 刘寻

Assistant Professor
National Young Talent
Presidential Young Fellow
School of Science and Engineering
The Chinese University of Hong Kong,Shenzhen

EDUCATION
Ph.D, The Hong Kong University of Science and Technology, 2017
B.Eng, Zhejiang University,2011
Email
liuxun'at'cuhk.edu.cn(Replace 'at' with @)
Tel
0751-23519629
Address
2001 Longxiang Boulevard, Longgang District, Shenzhen 518172, Guangdong, China
Google Scholar
https://scholar.google.com/citations?user=Tv3fr-wAAAAJ&hl
Research Interests
  • power management IC （high frequency DC-DC converters, 3-level buck converters and power amplifier supply modulators design.）
  • analog IC
Personal Profile
Dr. Xun Liu is an assistant professor with the School of Science and Engineering (SSE), Chinese University of Hong Kong, Shenzhen. Her research interests include power management integrated circuits design, radio-frequency power amplifier system design for 5G, power management module design for Internet-of-Things (IoT), a monolithic system design of GaN device and its driver, etc.
Dr. Liu received the B.Eng. degree in Electronic and Information Engineering from Zhejiang University, China in 2011, and the Ph.D. degree in electronic and computer engineering from The Hong Kong University of Science and Technology (HKUST), Hong Kong, in 2017. She was a senior design engineer with Qualcomm, Santa Clara, CA, USA, working on cutting-edge integrated circuits and systems designs for 5G application and holding 2 US patents.
Dr. Liu is a technical program committee (TPC) member of International Solid-State Circuit Conference (ISSCC), the most prominent conference in the entire IC field. She published more than ten papers in IEEE journals and conferences in IC design. Her first-authored papers include one in ISSCC and 2 in Journal of Solid-State Circuits (JSSC), the most renowned journal in IC field.

Publication

Journal Papers
  1. Xingfa Yan, Gang Liu, Chen Hu, Kaisong Zhu, Zhaojun Liu, Xun Liu, and Junmin Jiang, "Design and Analysis of a Hybrid Inverting Buck Converter with 5μs Response Time and 92.9% Efficiency for Micro-LED Displays," in IEEE Transactions on Power Electronics (T-PEL), doi: 10.1109/TPEL.2025.3584285( Early Access ).
  2. Chen Hu, Weiye Song, Tuo Li, Guoqing Li, Sijun Du, Xun Liu, and Junmin Jiang, "A Single-Stage Four-Phase Hybrid Boost Converter With 11-to-20 VCRs for LiDAR Driver Applications," in IEEE Trans. Circuits and Systems I (TCAS-I), doi: 10.1109/TCSI.2025.3580499( Early Access ).
  3. Zhiyuan Chen, Xianren Hao, Zhen Li, Yan Ma, Jing Wang, Xun Liu, Sijun Du, Jun Han, and Xiaoyang Zeng, "An Energy Harvesting Interface based on Reconfigurable Piezoelectric Harvester Array," in IEEE Transactions on Power Electronics (T-PEL), doi: 10.1109/TPEL.2025.3577696( Early Access ).
  4. Yongjuan Shi, Xun Liu, Chen Hu, Xiyuan Tang, and Junmin Jiang, "A Dual Slope Boosted Relaxation Oscillator With 2.93 μJ/Cycle Energy Efficiency and 0.068% Period Jitter in 180 nm CMOS," in IEEE Trans. Circuits and Systems I (TCAS-I), vol. 72, no. 6, pp. 2520-2528, Jun. 2025.
  5. Junyi Ruan, Junmin Jiang, Chenzhou Ding, Kai Yuan, Ka Nang Leung, Zhiyuan Chen, Xiaoyang Zeng, and Xun Liu, "A Hybrid Buck-or-Boost Converter for Fast-Transient and Wide-Voltage-Range Applications With Continuous Output Delivery Current," in IEEE J. Solid-State Circuits (JSSC), doi: 10.1109/JSSC.2024.3523914( Early Access ).
  6. Hing Tai Chen, Xun Liu, and Ka Nang Leung "A 1.48-fs FoM Analog Capacitorless-LDO With Cascade-Inverter-Based Pseudo-Power Transistor," in IEEE Solid-State Circuits Letters (SSCL), vol. 8, pp. 25-28, 2025.
  7. Yajun Lin, Hing Tai Chen, Xun Liu, and Ka Nang Leung, "A High-Current-Efficiency Digital-Assisted Analog LDO With Dual-Biasing Mode for Near-Threshold Regulation," in IEEE J. Solid-State Circuits (JSSC), vol. 60, no. 6, pp. 2037-2047, Jun. 2025.
  8. Jing Wang, Yi Yang, Zhen Li, Sijun Du, Xinling Yue, Xun Liu, Jun Han, Xiaoyang Zeng, and Zhiyuan Chen "Enhancing Efficiency in Piezoelectric Energy Harvesting: Collaborative-Flip Synchronized Switch Harvesting on Capacitors Rectifier and Multioutput DC-DC Converters Utilizing Shared Capacitors," in IEEE J. Solid-State Circuits (JSSC), vol. 60, no. 4, pp. 1474-1485, Apr. 2025.
  9. Junyi Ruan, Junmin Jiang, Chenzhou Ding, Yunxiao Li, Yanhui Wu, Ka Nang Leung, and Xun Liu, "A 2.8 μs Response Time 95.1% Efficiency Hybrid Boost Converter With RHP Zero Elimination for Fast-Transient Applications," in IEEE J. Solid-State Circuits (JSSC), Vol. 59, No. 9, pp. 2960-2970, Sep. 2024.
  10. Junwen Li, Xun Liu, and Ka Nang Leung, "A 24-to-240 W 95.6%-Efficiency <300-μs-Settling-Time Hybrid MCR/PT Wireless Power Transfer System" in IEEE Transactions on Power Electronics (T-PEL), Vol. 39, No. 7, pp. 8928-8946, Jul. 2024.
  11. Tianqi Lu, Ruizhi Wang, Zhong Tang, Yiwei Zou, Xinling Yue, Yansong Liang, Haoran Gong, Shurui Liu, Zhiyuan Chen, Xun Liu, Junmin Jiang, Bo Zhao, and Sijun Du, "A Thermoelectric Energy Harvesting System Assisted by A Piezoelectric Transducer Achieving 10-mV Cold-Startup and 82.7% Peak Efficiency," in IEEE Transactions on Power Electronics (T-PEL), vol. 39, No. 5, pp. 6352-6363, May. 2024.
  12. Yajun Lin, Xun Liu, and Ka Nang Leung, "A Bandwidth-Boosted Hybrid LDO With Spike-To-Time Converter for Near-Threshold Regulation," in IEEE Transactions on Power Electronics (T-PEL), vol. 39, no. 3, pp. 3452-3463, Mar. 2024.
  13. Yong Zhou, Hetong Wang, Yinglyu Xiong, Xun Liu, Yanqi Zheng, Kong-Pang Pun, and Ka Nang Leung, "A Direct 24V to 1V Multilevel Multiphase Hybrid Buck Converter With Automatic VCF Balancing and Current Sharing Mechanism," in IEEE Journal of Emerging and Selected Topics in Power Electronics (JEMSEL), vol. 11, no. 6, pp. 5954-5968, Dec. 2023.
  14. Yifan Jiang, Chen Hu, Han Wu, Yan Lu, Xun Liu and Junmin Jiang, "A Battery to 70V Hybrid Boost Converter Achieving 14-to-20 VCR for Piezoelectric Actuators," in IEEE Trans. Circuits and Systems II (TCAS-II), vol. 70, no. 10, pp. 3857-3861, Oct. 2023.
  15. Junmin Jiang, Xu Zhang, Xun Liu, Zhaojun Liu, Liusheng Sun, Shing Hin Yuen, Wing Cheung Chong, Wing-Hung Ki, C. Patrick Yue, and Kei May Lau, “A Fully-Integrated Micro-Display System With Hybrid Voltage Regulator,” IEEE Journal on Emerging and Selected Topics in Circuits and Systems (JETCAS), vol. 13, no. 2, pp. 605–616, Jun. 2023.
  16. Yong Zhou, Junwen Li, Xun Liu (co-corresponding), Yanqi Zheng, and Ka Nang Leung, “Bidirectional Buck-Boost Converter With Reduced Power Loss and No Right-Half-Plane Zero,” IEEE Trans. Power Electronics (T-PEL), Vol. 38, No. 2, pp. 2127-2142, Feb. 2023.
  17. Chi-Hang Chan, Lin Cheng, Wei Deng, Peng Feng, Li Geng, Mo Huang, Haikun Jia, Lu Jie, Ka-Meng Lei, Xihao Liu, Xun Liu, Yongpan Liu, Yan Lu, Kaiming Nie, Dongfang Pan, Nan Qi, Sai-Weng Sin, Nan Sun, Wenyu Sun, Jiangtao Xu, Jinshan Yue, Milin Zhang, Zhao Zhang, “Trending IC design directions in 2022,” J. Semicond., vol. 43, no. 7, pp. 071401–47, 2022. (Invited paper)
  18. Xun Liu, Junmin Jiang, Cheng Huang, and Philip K. T. Mok, “Loop Analysis and Stability Considerations of Hybrid PA Supply Modulators,” IEEE Trans. Circuits and Systems II (TCAS-II), vol. 69, no. 10, pp. 4143–4147, 2022.
  19. Xun Liu, Junmin Jiang, Cheng Huang, and Philip K. T. Mok, “Design Techniques for High-Efficiency Envelope-Tracking Supply Modulator for 5th Generation Communication,” IEEE Trans. Circuits and Systems II (TCAS-II), vol. 69, no. 6, pp. 2586–2591, Jun. 2022.
  20. Siu-Hong Wu, Xun Liu, Qiping Wan, Qin Kuai, Ying-Khai Teh, and Philip K. T. Mok, “A 0.3-V Ultralow-Supply- Voltage Boost Converter for Thermoelectric Energy Harvesting with Time-Domain-Based MPPT”, in IEEE Solid-State Circuits Letters (SSCL), vol. 4, pp.100-103, 2021.
  21. Junmin Jiang, Xun Liu, Wing-Hung Ki, Philip K. T. Mok, and Yan Lu, “Circuit Techniques for High Efficiency Fully-Integrated Switched-Capacitor Converters,” in IEEE Trans. Circuits and Systems II (TCAS-II), vol. 68, no. 2, pp. 556-561, Feb. 2021. (Invited paper)
  22. Junmin Jiang, Xun Liu, Wing-Hung Ki, Philip K. T. Mok, and Yan Lu, “A Multi-Phase Switched-Capacitor Converter for Fully Integrated AMLED Micro Display System,” in IEEE Trans. Power Electronics (T-PEL), vol. 35, no. 6, pp. 6001-6011, Jun. 2020.
  23. Junmin Jiang, Xun Liu, Cheng Huang, Wing-Hung Ki, Philip K. T. Mok, and Yan Lu, “Subtraction-Mode Switched-Capacitor Converters With Parasitic Loss Reduction,” in IEEE Trans. Power Electronics (T-PEL), vol.35, no. 2, pp. 1200-1204, Feb. 2020.
  24. Xun Liu, Heng Zhang, Philip K. T. Mok, and Howard C. Luong, "A Multi-Loop-Controlled AC-Coupling Supply Modulator With a Mode-Switching CMOS PA in an EER System With Envelope Shaping," in IEEE J. Solid-State Circuits (JSSC), vol. 54, no. 6, pp. 1553-1563, Jun. 2019,
  25. Xun Liu, Cheng Huang and Philip K. T. Mok, “A High-Frequency 3-Level Buck Converter with Real-Time Calibration and Wide Output Range for Fast-DVS,” in IEEE J. Solid-State Circuits (JSSC), vol. 53, no. 2, pp. 582-595, Feb. 2018.
  26. Xun Liu, Philip K. T. Mok, Junmin Jiang and Wing-Hung Ki, “Analysis and Design Considerations of Integrated 3-Level Buck Converters,” in IEEE Trans. Circuits and Systems I (TCAS-I), vol. 63, no. 5, pp. 671-682, May. 2016.
Conference Papers
  1. Yinglyu Xiong, Zehao Tao, Miaomiao Chen, Xun Liu, and Ka Nang Leung, "Analysis and Modeling of Hybrid Boost Converter With Always Reduced Inductor Current and Continuous Output-Current Delivery," in IEEE International Symposium on Circuits and Systems (ISCAS), London, United Kingdom, 2025, pp. 1-5.
  2. Lingfeng Zhu, Chen Hu, Wing-Hung Ki, Xun Liu, Xiaosen Liu, and Junmin Jiang, "A 6.87W 3.7-5V Input 12.6-24V Output Switched-Capacitor Sigma Converter with Multiple Voltage Domains," in IEEE Custom Integrated Circuits Conference (CICC), Boston, MA, USA, 2025, pp. 1-3.
  3. Kai Yuan, Chenzhou Ding, Junmin Jiang, Tiantian Tang, Junyi Ruan, Yelei Xie, Faen Liu, Shuguo Jiang, Tao Liu, Ka Nang Leung, and Xun Liu, "A 4-phase integrated voltage regulator with in-package inductors achieving 89.0% peak efficiency and 65% droop improvement for 6A/2ns Transient," in IEEE Asian Solid-State Circuits Conference (ASSCC), Hiroshima, Japan Nov. 2024.
  4. Yongjuan Shi, Chen Hu, Xiaosen Liu, Xun Liu, and Junmin Jiang, "Methods of Reducing the Intrinsic Loss for Continuously-Scalable-Conversion-Ratio SC Converters," in IEEE Asia Pacific Conference on Circuits and Systems (APCCAS), Taipei, Taiwan, 2024, pp. 763-766,
  5. Junyi Ruan, Junmin Jiang, Chenzhou Ding, Kai Yuan, Ka Nang Leung, and Xun Liu, "A Li-ion-Battery-Input 1-6-V Output Bootstrap-Free Hybrid Buck-or-Boost Converter without RHP Zero Achieving 97.3% Peak Efficiency 6μs Recovery Time and 1.13µs/V DVS Rate," in IEEE Int. Solid-State Circuits Conference (ISSCC), San Francisco, USA, Feb. 2024, pp. 148-149.
  6. Chen Hu, Xinran Huang, Xun Liu, Sijun Du, Xiaosen Liu, and Junmin Jiang "A 3.6 W 16V-Output 180ns-Response-Time 94%-Efficiency SC Sigma Converter with Output Impedance Compensation and Ripple Mitigation for LiDAR Driver Applications," in IEEE Int. Solid-State Circuits Conference (ISSCC), San Francisco, USA, Feb. 2024, pp. 508-510.
  7. Gang Liu, Han Wu, Chen Hu, Cheng Huang, Xun Liu, and Junmin Jiang, "An 85-264Vac to 3-4.2Vdc 1.05W Capacitive Power Converter with Idle Power Reduction and 4-Phase 1/10X SC Converter Achieving 5.11mW Quiescent Power and 78.2% Peak Efficiency," in IEEE Int. Solid-State Circuits Conference (ISSCC), San Francisco, USA, Feb. 2024, pp. 512-513.
  8. Junmin Jiang, Yan Lu, Xun Liu, Wing-Hung Ki, Philip K. T. Mok, U Seng-Pan, and Rui P. Martins, "A Dual-Output SC Converter with Dynamic Power Allocation for Multi-Core Application Processors," in IEEE Asia and South Pacific Design Automation Conference (ASPDAC), Jan. 2018, pp. 285-286.
  9. Xun Liu, Heng Zhang, Min Zhao, Xuan Chen, Philip K. T. Mok, and Howard C. Luong, "A 2.4V 23.9dBm 35.7%-PAE -32.1dBc-ACLR LTE-20MHz Envelope-Shaping-and-Tracking System with a Multiloop-Controlled AC-Coupling Supply Modulator and a Mode-Switching PA," in IEEE Int. Solid-State Circuits Conference (ISSCC), San Francisco, USA, Feb. 2017, pp. 38-39.
  10. Xun Liu, Junmin Jiang, Philip K. T. Mok, and Wing-Hung Ki, "Methods for Measuring Loop-Gain Function of High-Frequency DC-DC Converters," in IEEE Asia Pacific Conference on Circuits and Systems (APCCAS), Jeju, Korea, Oct. 2016, pp. 247-249.
  11. Xun Liu, Cheng Huang, and Philip K. T. Mok, "A 50MHz 5V 3W 90% Efficiency 3-Level Buck Converter with Real-Time Calibration and Wide Output Range for Fast-DVS in 65nm CMOS," in IEEE Symposium of VLSI Circuits (VLSIC), Honolulu, USA, Jun. 2016.
  12. Xun Liu, Cheng Huang, and Philip K. T. Mok, "Dynamic Performance Analysis of 3-level Integrated Buck Converters", in IEEE International Symposium on Circuits and Systems (ISCAS), Lisbon, Portugal, May 2015, pp. 2093-2096.
Patents Filed
  1. 丁琛洲，刘寻，罗元，姜俊敏, “一种高增益的开关直流升压电路”, 中国专利 CN115242093B，2023-06-06授权。
  2. 阮珺逸，刘寻，罗元，姜俊敏, “一种高电压转换比的升压变换器及其控制系统”，中国专利 CN115296539B，2023-01-06授权。
  3. 李云宵，刘寻，罗元，姜俊敏, “一种适用于低压输入大电流输出的LDO系统”, 中国专利 CN115237193B，2022-12-09授权。
  4. XL Linfei Guo, Chengwu Tao, Joseph Duncan, Xiaocheng Jing, Amir Parayandeh,” Techniques for current sensing for single-inductor multiple-output (simo) regulators” US Patent 16,553,759
  5. XL Mukesh Bansa, lIulian Mirea” Rail-to-rail source follower buffer for switching regulator driver supply” US Patent US20210184661A1