David K Cheung

Title: The Innovations of David K. Cheung

Introduction

David K. Cheung is a notable inventor based in Milpitas, California. He has made significant contributions to the field of automatic test equipment systems, holding three patents to his name. His work focuses on enhancing the efficiency and effectiveness of testing devices in various applications.

Latest Patents

One of Cheung's latest patents is an "Automatic test equipment system using pin slice architecture." This invention features a plurality of 'pin slice' circuits, each associated with a separate pin of the device under test (DUT). Each pin slice circuit contains its own memory, registers, and circuitry for generating the necessary test signals. Test data is loaded into the individual pin slice circuits in a vertical word fashion, allowing the characteristics of an individual pin test sequence to be varied independently of the other pins. A participate memory is utilized to select different groupings of the pin slice circuits that are programmed in parallel when a group of pins receives the same test signals. Additionally, separate enable signals to various stages of the pin slice circuits allow different aspects of the test pattern to be varied independently.

Another significant patent is for "Driver circuits for IC tester." This invention provides driver circuits that also serve as termination and clamp in an IC tester. When driving a port of a DUT between two predetermined voltage levels, the driver's I/O terminal is switched between these levels with an output impedance that matches the transmission line between the driver circuit and the DUT. The driver circuit can be programmed to provide one of two types of termination based on the DUT's capabilities.

Career Highlights

David K. Cheung is currently employed at Schlumberger Technologies, Inc., where he continues to innovate and develop advanced testing solutions. His work has had a profound impact on the efficiency of testing processes in the industry.

Collaborations

Throughout his career, Cheung has collaborated with notable colleagues, including Egbert Graeve and Richard F. Herlein. These collaborations have contributed to the advancement of technology in the field of automatic testing.

Conclusion

David K. Cheung's contributions to the field of automatic test equipment systems demonstrate his innovative spirit and technical expertise. His patents reflect a commitment to improving testing methodologies, making him a significant figure in the industry.