Xiao-Hong Du

Title: Innovations by Inventor Xiao-Hong Du

Introduction

Xiao-Hong Du is a notable inventor based in Colorado Springs, CO (US). He has made significant contributions to the field of ferroelectric memory and non-volatile counting systems. With a total of 4 patents to his name, his work has advanced the technology used in memory circuits and counting mechanisms.

Latest Patents

One of his latest patents is titled "Circuit for generating a centered reference voltage for a 1T/1C ferroelectric memory." This innovative circuit generates a reference voltage that is proportional to (P+U)/2, ensuring it is automatically centered between the bit line voltages corresponding to the P term and the U term across a wide range of temperatures and voltages. To prevent fatigue in the reference ferroelectric capacitors, the reference voltage is refreshed every millisecond. Additionally, to mitigate variations in the reference voltage due to leakage in the ferroelectric capacitors, the voltage is digitized during the refresh period. This digital value is then converted to an analog signal, which is utilized by sense amplifiers to resolve data states. The design maximizes the signal margin by ensuring the reference voltage is centrally located between the switching (P) and non-switching (U) signals.

Another significant patent is the "Counting scheme with automatic point-of-reference generation." This counting scheme for a non-volatile counter incorporates automatic point-of-reference generation through a state machine. It utilizes two state variables to track the rotation history of a magnet. One variable records the previous position of the magnet, while the other captures the net angle traveled from the reference point. The first pulse location after a counter reset is automatically designated as the reference point until the next reset occurs. As the non-volatile counter counts up or down, the second state variable resets to zero, and the first state variable is updated to the reference point, marking the beginning of a new revolution.

Career Highlights

Xiao-Hong Du is currently employed at Ramtron International Corporation, where he continues to innovate and develop advanced technologies. His work has been instrumental in enhancing the performance and reliability of memory circuits and counting systems.

Collaborations

Xiao-Hong has collaborated with notable colleagues, including Craig V. Taylor and Shan Sun, who contribute to the innovative environment at Ramtron International Corporation.

Conclusion