Zhengzheng Wu

Title: Innovations of Zhengzheng Wu

Introduction

Zhengzheng Wu is a prominent inventor based in Santa Clara, CA (US). He has made significant contributions to the field of digital electronics, holding a total of 9 patents. His work primarily focuses on enhancing the efficiency and stability of digital-to-time converters and phase-frequency detectors.

Latest Patents

One of his latest patents is titled "Power and area efficient digital-to-time converter with improved stability." This invention involves a digital-to-time converter (DTC) that converts a digital code into a time delay using a capacitor digital-to-analog converter (CDAC) that functions as a charging capacitor. The DTC includes a switched capacitor voltage-to-current converter that forms a charging current for the charging capacitor, responding to a triggering clock edge that initiates the time delay. A comparator is utilized to compare the voltage on the charging capacitor to a threshold voltage, determining the end of the time delay.

Another notable patent is the "Digital phase-frequency detector with split control loops for low jitter and fast locking." This invention characterizes the delay between two input clock signals using a ring oscillator. The cycle count of a ring oscillator signal circulating through a loop during the delay provides a coarse measurement, while the phase of the ring oscillator signal at the end of the delay offers a fine measurement. A digital phase-locked loop controls the oscillation frequency of a digitally-controlled oscillator based on the fine measurement and manages a division within a clock divider based on the coarse measurement.

Career Highlights

Zhengzheng Wu is currently employed at Qualcomm Incorporated, a leading company in the telecommunications and semiconductor industry. His innovative work has contributed to advancements in digital signal processing and timing solutions.

Collaborations

He has collaborated with notable coworkers such as Chao Song and Karthik Nagarajan, further enhancing the impact of his inventions in the field.

Conclusion

Zhengzheng Wu's contributions to digital electronics through his patents demonstrate his expertise and innovative spirit. His work continues to influence advancements in technology, making significant strides in the efficiency and stability of electronic systems.