Wing Cheong Mak

Title: Wing Cheong Mak: Innovator in Electro-Magnetic Interference Reduction

Introduction

Wing Cheong Mak 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 focuses on enhancing noise immunity and process tolerance through advanced circuitry.

Latest Patents

Wing Cheong Mak holds a patent for a groundbreaking invention titled "Programmable electro-magnetic-interference (EMI) reduction with enhanced noise immunity and process tolerance." This patent describes 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 derived from the reduced sawtooth wave, allowing the 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, which reduces the sensitivity of dithering to errors in the DAC, enabling the use of a less precise and more cost-effective DAC.

Career Highlights

Wing Cheong Mak is associated with the Hong Kong Applied Science and Technology Research Institute. His work at this esteemed institution has allowed him to focus on innovative solutions that address real-world challenges in EMI reduction.

Collaborations

He has collaborated with notable colleagues, including Chi Tak (Gerry) Leung and Chik Wai (David) Ng. Their teamwork has contributed to advancements in their respective fields and has fostered a collaborative environment for innovation.

Conclusion

Wing Cheong Mak's contributions to the field of electro-magnetic interference reduction exemplify the spirit of innovation. His patent reflects a deep understanding of electronic systems and a commitment to enhancing technology.