Vincent Sin-Luen Cheung

Title: Innovations of Vincent Sin-Luen Cheung

Introduction

Vincent Sin-Luen Cheung is a notable inventor based in Hong Kong, CN. He has made significant contributions to the field of electronics, particularly in the development of charge pump technology. His innovative approach has led to the creation of a patent that enhances the performance of phase-locked loops (PLLs).

Latest Patents

Vincent Cheung holds a patent titled "Calibration of up and down charge-pump currents using a sample-and-hold circuit during idle times." This invention focuses on a charge pump for a phase-locked loop (PLL) that ensures accurate matching of charge and discharge currents applied to the PLL's loop filter. The technology involves a variable current-sink transistor whose gate-to-source voltage is adjusted to match a source current from a fixed current source. An intermediate node between series transistors is sampled by a sampling transistor connected to a sampling capacitor. The voltage on the sampling capacitor represents the gate-to-source voltage of the variable current-sink transistor. During calibration periods, the variable current-sink transistor's gate and drain are coupled together through the sampling transistor. This process ensures that when the source current matches the sink current, the gate-to-source voltage stored on the sampling capacitor reaches a steady state, balancing the up and down currents in the driver transistors.

Career Highlights

Vincent Cheung is currently employed at Pericom Technology Inc., where he continues to innovate and develop advanced electronic solutions. His work has been instrumental in improving the efficiency and accuracy of electronic circuits.

Collaborations

Vincent collaborates with Gary Wing-Kei Wong, a fellow innovator in the field. Their partnership has fostered a creative environment that encourages the development of cutting-edge technologies.

Conclusion

Vincent Sin-Luen Cheung's contributions to the field of electronics through his innovative patent demonstrate his expertise and commitment to advancing technology. His work at Pericom Technology Inc. continues to influence the industry positively.