Jiann-Chyi Sam Shieh

Title: Jiann-Chyi Sam Shieh: Innovator in Laser Diode Technology

Introduction

Jiann-Chyi Sam Shieh is a prominent inventor based in San Jose, California. He has made significant contributions to the field of electronics, particularly in laser diode technology. With a total of 4 patents to his name, Shieh has demonstrated his expertise and innovative spirit in various applications.

Latest Patents

One of his latest patents is focused on the driving circuit of a laser diode and the associated driving method. This method involves setting a bias current, a modulation current, a first target corresponding to a predetermined average power, and a second target corresponding to a predetermined average modulation power. The process includes executing a first adjusting current step group, generating a temporary modulation current based on the modulation current, and executing a second adjusting current step group. The method is designed to enhance the performance and efficiency of laser diodes.

Another notable patent by Shieh is the dual-loop phase lock loop. This invention comprises a phase frequency detector, a first charge pump, a second charge pump, a first capacitor, a filter, a first adder, a voltage-controlled delay line, and a frequency divider. The phase frequency detector outputs a switch signal based on a reference clock and a divided feedback clock. The first charge pump and capacitor generate a coarse control voltage, while the second charge pump, filter, and adder create a fine control voltage. This innovative design improves the stability and accuracy of phase-locked loops.

Career Highlights

Throughout his career, Jiann-Chyi Sam Shieh has worked with several notable companies, including Broadcom Corporation and Etron Technology, Inc. His experience in these organizations has allowed him to refine his skills and contribute to cutting-edge technologies in the electronics industry.

Collaborations

Shieh has collaborated with talented individuals such as Ning Li and Wei-Chuan Cheng. These partnerships have fostered innovation and have led to advancements in their respective fields.

Conclusion

Jiann-Chyi Sam Shieh is a distinguished inventor whose work in laser diode technology and phase-locked loops has made a significant impact in the electronics sector. His patents reflect his commitment to innovation and excellence in engineering.