• Health Sensing Team: system architecture and end-to-end system modeling of next-generation health sensing solutions for Apple Watch• Touch Sensing Team: design and system integration with cross-functional collaboration to deliver the next-generation touch sensing technologies across various product lines

• A tiny, wireless, injectable sensing device that uses ultrasound to monitor physiological signals, such as the body temperature, to provide distributed and localized sensing inside the body at the desired locations for both diagnostic and therapeutic procedures.- Included in two Wikipedia pages as a scientific breakthrough and cited as "the world’s smallest single-chip system" with a size comparable to that of a dust mite- Interviewed by VICE News (link shown below)- Produced a granted patent and several high-impact publications, including a Science Advances paper (Altmetric Attention Score of 920 currently, link shown below)- Reported by numerous media outlets from different countries across the globe in multiple languages (https://scienceadvances.altmetric.com/details/105479205/news)- Twittered over 1000 times covering over 1.5M followers• A two-dimensional (4 mm x 5 mm) ultrasound phased-array transceiver in TSMC 180nm technology with a 26×26 array of integrated piezoelectric transducers for emerging applications such as ultrasound neuromodulation and ultrasonic powering of implantable devices. With novel and customized integration and packaging approaches, this device is several orders of magnitude smaller than commercially available ultrasound imaging probes.• An inductively powered CMOS transceiver with integrated RF receiver coils for simultaneous two-way, near-field data telemetry and power transmission for implantable systems. The design features customized fabrication approaches making the chip thin and flexible with a tissue-like form factor that has not been achieved before.

• Investigated the sources of temperature variations in resistor-capacitor (RC) oscillator• Developed a low-power RC oscillator for medical devices with a local supply that tracked inverter delays and a temperature-stable resistor to compensate for temperature variations as well as digital trimming using low-resistance switches to compensate for process variations

• Investigated the minimum achievable phase noise / jitter of resistor-capacitor (RC) oscillators• Designed from scratch a complete low-jitter and low-power relaxation oscillator featuring comparator offset cancellation and adaptive biasing for medical implants and wearable devices

• Developed the matching networks for Near Field Communication (NFC) boards, tuned the NFC antennas to the 13.56MHz operating frequency, and tested NFC chips in mobile testing platforms• Debugged the FM radio module in mobile testing platforms using spectral analyzer and simulated FM receiver circuits using ADS

• Developed a receiver board for wirelessly charging low-power devices• Optimized parameters, including Q and coupling coefficient, of the magnetically coupled resonators used in asymmetrical 4-element WPT applications in terms of either efficiency or range

• Built a whole body plethysmography device and created data acquisition and processing programs in LabVIEW and MATLAB to noninvasively monitor respiratory parameters of freely moving rats• Investigated the relationships between tolerance to morphine-induced analgesia and tolerance to morphine-induced respiratory depression on young rats using a plethysmography device

• Designed an augmented reality (AR) display system to inject virtual guiding information and biomedical imaging data to an eyepiece of a surgical microscope for image guided interventions• Developed an optical system that projects structured light to eye fundus for 3D reconstruction of the fundus surface for ocular surgery