Shih-Chung Fan

Title: Innovations of Shih-Chung Fan

Introduction

Shih-Chung Fan is a notable inventor based in Fremont, California. He has made significant contributions to the field of electronics, particularly in clock recovery circuits and digital jitter attenuation. With a total of three patents to his name, Fan continues to push the boundaries of innovation in his field.

Latest Patents

One of his latest patents is a clock recovery circuit. This circuit features a transition detector connected to an incoming data stream. The output of the transition detector is linked to a gate, such as a D flip-flop, which receives the recovered clock. The circuit generates a zero or one output based on whether the transition occurs before or after the rising edge of the recovered clock. An accumulator circuit counts each transition and provides results to a comparison circuit. This comparison circuit evaluates the accumulated count against maximum and minimum thresholds, issuing advance or retard outputs when those thresholds are surpassed. Additionally, a phase circuit adjusts the phase of the recovered clock by advancing or retarding it after detecting a sufficient number of transitions.

Another significant patent is a digital jitter attenuator that utilizes an accumulated count of phase differences. This phase detector identifies the phase difference between the input clock and the output clock. The detected phase difference is used to gate a high-frequency clock, which is then fed into the clock input of an up/down counter. The phase detector also indicates whether the phase difference is positive or negative. When the counter reaches a specified up or down count, an advance or retard signal is sent to a phase selector. The phase selector then chooses one of several clock phases for the output clock.

Career Highlights

Shih-Chung Fan is currently employed at Exar Corporation, where he continues to innovate and develop new technologies. His work has had a significant impact on the electronics industry, particularly in improving the performance of clock recovery and jitter attenuation systems.

Collaborations

Fan collaborates with Roubik Gregorian, a talented woman in the field, contributing to the advancement of their projects and innovations.

Conclusion

Shih-Chung Fan's contributions to the field of electronics through his patents and work at Exar Corporation highlight his role as a leading inventor. His innovative solutions in clock recovery and digital jitter attenuation continue to influence the industry.