Chi Tak (Gerry) Leung

Title: Innovations of Chi Tak (Gerry) Leung

Introduction

Chi Tak (Gerry) Leung is a notable inventor based in Hong Kong, CN. He has made significant contributions to the field of electro-magnetic interference (EMI) reduction. His innovative approach has led to the development of a unique patent that addresses critical issues in electronic design.

Latest Patents

Leung holds a patent for a "Programmable electro-magnetic-interference (EMI) reduction with enhanced noise immunity and process tolerance." This invention features a frequency dithering circuit that effectively reduces emissions causing EMI by spreading the spectrum of a clock. The clock sequences a counter that drives a digital count value to a digital-to-analog converter (DAC). The DAC outputs a sawtooth wave with a wide voltage swing. A subtractor scales down the voltage swing to produce a reduced-swing sawtooth wave, which is used as an upper limit voltage. Comparators trigger a set-reset latch to toggle the clock when current pumps charge and discharge a capacitor beyond voltage limits. The upper limit voltage is the reduced sawtooth wave from the subtractor, allowing the amount of time to charge the capacitor to vary, thus dithering the period of the clock. The degree of dithering can be adjusted by programming the feedback resistance in the subtractor. This design reduces the sensitivity of dithering to errors in the DAC, enabling the use of an inexpensive, less precise DAC.

Career Highlights

Leung is associated with the Hong Kong Applied Science and Technology Research Institute, where he continues to innovate and contribute to advancements in technology. His work focuses on enhancing electronic systems and improving their performance in various applications.

Collaborations

Leung collaborates with talented individuals such as Chik Wai (David) Ng and Hing Kit Kwan. Their combined expertise fosters a creative environment that drives innovation and technological progress.

Conclusion

Chi Tak (Gerry) Leung's contributions to EMI reduction technology exemplify the impact of innovative thinking in the field of electronics. His patent showcases a practical solution to a common problem, highlighting the importance of research and development in advancing technology.