Takao Matsui

Title: Takao Matsui: Innovator in Optical Communication Technology

Introduction

Takao Matsui is a prominent inventor based in Kashihara, Japan. He has made significant contributions to the field of optical communication technology, holding a total of 3 patents. His work focuses on enhancing the efficiency and effectiveness of communication systems through innovative circuit designs.

Latest Patents

One of Matsui's latest patents is a receiving circuit for free-space optical communication. This invention features an amplifier circuit that amplifies the difference between an output voltage from a current voltage conversion circuit and a bias voltage. The current voltage conversion circuit is responsible for converting the photocurrent from a photodiode, which detects incoming light, into a voltage. A gm-amp charges or discharges a capacity based on the difference between the output voltage from the amplifier circuit and a reference voltage. Additionally, a field effect transistor supplies a drain current controlled by voltages at the respective terminals of the capacity to the photodiode, preventing variations in the output voltage of the amplifier circuit due to a DC photocurrent flowing in the photodiode.

Another notable patent is a comparator circuit that includes a differential amplifier with load resistors. This circuit amplifies the difference between two input voltages and features an emitter follower circuit that applies positive feedback to the differential amplifier. The grounded-base amplifier outputs both voltage and current, eliminating the need for a current switch circuit to obtain current output from the comparator circuit.

Career Highlights

Matsui is currently employed at Sharp Kabushiki Kaisha Corporation, where he continues to develop innovative technologies. His work has significantly impacted the field of optical communication, showcasing his expertise and dedication to advancing technology.

Collaborations

Throughout his career, Matsui has collaborated with notable colleagues, including Akio Nakajima and Kohichi Furuta. These collaborations have further enriched his work and contributed to the success of various projects.

Conclusion

Takao Matsui is a distinguished inventor whose contributions to optical communication technology are noteworthy. His innovative patents and collaborations reflect his commitment to advancing the field. His work continues to influence the development of efficient communication systems.