Academic Profile : Faculty

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Dr Ji-Jon Sit
Senior Lecturer, School of Electrical & Electronic Engineering
 
Ji-Jon (JJ) SIT has always been fascinated by feedback control and analog electronics. His liberal arts university education at Yale could be credited for enabling his return to analog electronics for graduate studies, despite doing his FYP on an 8-issue microprocessor.

At MIT he joined the Analog VLSI and Biological Systems Group under Rahul Sarpeshkar, and wrote his PhD dissertation on an analog architecture for neural stimulation of the cochlea, to aid in music perception for the deaf.

This led to employment at Advanced Bionics in California as a Sr. RF and Systems engineer, where he worked from 2007-2015 on RFIC design, stimulation architecture, and telemetry systems in their latest cochlear implant.

From 2015-2017 he joined Nalu Medical Inc. based in Carlsbad CA, which has recently released a minimally invasive platform technology for neuromodulation, and capable of implantation across multiple sites in the body.
My current research interest is in near-field RF systems and design, for wireless power delivery and telemetry.

In particular, I want to employ analog feedback control to optimize the efficiency of the wireless link, and am developing a closed-loop system in discrete electronics. The final solution however would be miniaturized into an RFIC.

Recently, I am also involved in machine learning for forest recovery management and solving individual tree crown segmentation and classification problems from 2D and 3D point cloud datasets.
 
  • Closed-Loop Desensitization And Optimization Of Strongly-Coupled Magnetic Resonance Links For Wireless Power Transfer
US 2021/0119488 A1: Transmitter Device, Wireless Power Transfer System, And Methods Of Forming The Same (2022)
Abstract: Various embodiments may provide a transmitter device. The transmitter device may include an oscillator configured to operate at a variable oscillation frequency to generate an oscillator signal. The transmitter device may also include a transmitter antenna configured to transmit power to a receiver device via magnetic coupling based on the oscillator signal. The transmitter device may further include a feedback arrangement configured to generate a feedback to the oscillator based on a resonant frequency of the magnetic coupling between the transmitter antenna and a receiver antenna of the receiver device such that the variable oscillation frequency of the oscillator is adjusted towards the resonant frequency.