Research Assistant, Tsinghua University Research Interests: Power Management Integrated Circuits, Power Electronics Email: Ricardo.Sung@outlook.com / / / /

News

• Thrilled to have the opportunity to present my work as a poster at the PwrSoC workshop 2025.
• The invited paper, titled "A 1.52W Capacitor-Drop Sigma-Floating-SC AC-DC Converter for Grid Power to IoT Devices" has been accepted for publication.
• Join Power X Lab in Tsinghua University as a full-time research assistant.
• Received my Master of Philosopy degeree of Microelectronics from University of Macau in June 2025.
• 1 first-author paper accepted by CICC 2025.
• 1 first-author paper accepted by ISSCC 2025.

Work Experience

Education

Publication

1. Fei Song, Shousheng Han, Rui P. Martins, Yan Lu, "A 1.52-W Capacitor-Drop Sigma-Floating-SC AC/DC Converter for Grid Power to IoT Devices," in IEEE Journal of Solid-State Circuits, doi: 10.1109/JSSC.2025.3603990.
2. Shousheng Han*, Fei Song*, Zhongyao Zhu, Xiaoming Wu, Hanjun Jiang, Tianling Ren, Yan Lu, "A LEGO-Like Easy-Stacking Step-Up SC Converter with Ultra-High and Wide VCR Using All Input-Stress-Only Devices," 2025 IEEE Custom Integrated Circuits Conference (CICC), Boston, MA, USA, 2025, pp. 1-3, doi: 10.1109/CICC63670.2025.10983382.
3. Fei Song*, Shousheng Han*, Rui P. Martins, Yan Lu, An 85-230V AC to 3.3-4.6V DC 1.52W Capacitor-Drop Sigma-Floating-SC AC-DC Converter with 81.3% Peak Efficiency, 2025 IEEE International Solid-State Circuits Conference (ISSCC), San Francisco, CA, USA, 2025, pp. 1-3, doi: 10.1109/ISSCC49661.2025.10904504.
4. Fei Song*, Ying Zhang, and Jing Zhang, Optimization of CNN-based Garbage Classification Model, CSAE 2020, New York, USA, Article 107, 1–5. https://doi.org/10.1145/3424978.3425089.

Project

1. A segment-quantity-match minimized-ripple SITO converter

   May 2025 - July 2025
   • Wait for the next 180nm BCD MPW.
2. A non-cross-regulation fast-transient SIMO design

   Oct. 2024 - Now
   • This work is fabricated in a 180nmBCD process and under measurement now.
3. A slope-fitting SITO converter for AMOLED displays

   Oct. 2024 - Now
   • This work is fabricated in a 180nmBCD process and under measurement now.
4. An 85-230VAC input and 3.3-4.6VDC output AC-DC converter

   Oct. 2023 - Oct. 2024
   • A Sigma-Floating-SC topology is proposed to achieve 81.3% peak efficiency and 1.52W maximum output power.
   • Up to 10% increased efficiency over a large load current range, compared with prior works.
   • The design is fabricated in a 180nmBCD process and the manuscript has been accepted by ISSCC 2025.
5. Ultra-Light-Weight Multi-Chip Easy-Stacking Step-Up SC DC-DC Converter with Ultra-High and Wide VCR

   Oct. 2023 - Oct. 2024
   • The design is proposed to convert 5V voltage to 30V, 70V, and 150V to drive electrostatic and piezoelectric (PZT) actuators.
   • The proposed topology combines local drivers and level-shifters together without bootstrap capacitors to reduce the driver loss.
   • The design is fabricated in a 180nmBCD process and the manuscript has been accepted by CICC 2025.
6. A fast-transient response single-input-multiple-output DC-DC converter

   Sep. 2022 - Oct. 2023
   • The design utilize an auxiliary capacitor stacked with the input power source to increase the inductor charging speed and thereby improve the transient response.
   • Collaborated with 3Peak INCORPORATED.
7. Low-power, high transient response LDO design without off-chip capacitors

   Nov. 2020 - Aug. 2021
   • Developed a bandgap with 1.2V voltage reference and 50nA current reference, whose power consumption was less than 200nW, in the temperature variation range of -40 to 125 degrees celsius.
   • Developed a circuit of super positive feedback and self-bias amplifier, with static power consumption of 3-7uA and high bandwidth of 80M-160MHz.
   • Won the first prize of the National University Student Integrated Circuit Innovation and Entrepreneurship Competition in Southwest Devision (2021).
8. Smartphone-based Analysis of Non-destructive Apple Brix Measurement

   Apr. 2021 - Aug. 2021
   • Designed an optical system using Zemax OpticStudio to achieve Czerny-Turner Spectroscope structure using a positive (converging) lens, two spherical mirrors, a blazed grating and a linear CCD.
   • Designed a CCD driver board including a Xilinx FPGA, a Toshiba linear CCD, a high-speed and high-precision ADC and so on to capture light spectra and transmit digital spectra data to smart phones.
   • Programmed verilog HDL codes on Xilinx FPGA to drive CCD and ADC, besides communicating with smart phones by USB protocol.
   • Won the second prize of the National University Student’s Opt-Sci-Tech Competition (2021).
9. Intelligent Biological Microscope

   Apr. 2020 - July. 2020
   • Designed a multi-method of resizing and merging limited images under microscopes to make up a full cell image.
   • Migrated the M2Det algorithm to suit the blood cell recognition, segmentation, and counting.
   • Developed a dataset of blood cells with five classifications including neutrophils, lymphocytes, monocytes, eosinophils and basophils.
   • Won the first prize of the 8th National University Student’s Opt-Sci-Tech Competition (2020) and the first prize of China-U.S. Young Maker Competition in Chengdu Division (2020).
10. Intelligent Device to Protect Children left in Cars

    Apr. 2019 - July. 2019
    • Designed a multi-model network merged by AgeNet and Yolo-v2 to detect children left in cars.
    • Used sensors such as temperature and humidity sensor, Oxygen sensor and AIoT to send data to private servers.
    • Programmed a mobile app to receive warnings sent by servers to remind children’s guardians of the states in cars about their children.
    • Won the third prize of the National University Student’s Opt-Sci-Tech Competition (2019).

Honors & Awards

1. First Prize of the National University Student Integrated Circuit Innovation and Entrepreneurship Competition in Southwest Devision, 2021.
2. Second Prize of the National University Student’s Opt-Sci-Tech Competition, 2021.
3. First Prize of the National University Student’s Opt-Sci-Tech Competition, 2020.
4. First Prize of China-U.S. Young Maker Competition in Chengdu Division, 2020.
5. Third Prize of the National University Student’s Opt-Sci-Tech Competition, 2019.
6. Third Prize of the National Undergraduate Engineering Training Integration Ability Competition in Sichuan Province Division, 2019.

Leadership Experience

• Excellent President of Application Electronics Association

  Sep. 2019 – Sep. 2021
  Organized lectures and competitions about electronic design and program.
• Member of UESTC Linux User Group

  July 2020 – July 2021