Kazuhiko Kasai

Title: Kazuhiko Kasai: Innovator in Frequency Multiplication and DAC Technology

Introduction

Kazuhiko Kasai is a prominent inventor based in Yokohama, Japan. He has made significant contributions to the field of electronics, particularly in the development of frequency multiplier circuits and differential current source circuits in digital-to-analog converters (DACs). With a total of 11 patents to his name, his work continues to influence modern electronic design.

Latest Patents

One of Kazuhiko Kasai's latest patents is a frequency multiplier circuit. This invention features an input buffer circuit that supplies multiple signals in response to an input signal. The circuit includes a delay line made up of several delay cells connected in series, which delays the signals from the input buffer. A phase-locked loop (PLL) circuit is connected to the delay line and includes a level converter that outputs a control signal to manage the delay time. The output signal generation circuit produces a signal with a multiplied frequency, ensuring that the waveform of the output signal matches that of the delay cells, resulting in a fixed duty ratio.

Another notable patent is the differential current source circuit in a current driving type DAC. This circuit comprises three P-channel MOSFETs and two N-channel MOSFETs. The configuration allows for efficient current management, with a bias voltage applied to the gates of the MOSFETs. The design optimizes the current paths and enhances the performance of the DAC, making it suitable for various applications in electronic devices.

Career Highlights

Kazuhiko Kasai is currently employed at Kabushiki Kaisha Toshiba, a leading company in the electronics industry. His work at Toshiba has allowed him to collaborate with other talented engineers and contribute to innovative projects that push the boundaries of technology. His expertise in circuit design and implementation has made him a valuable asset to the company.

Collaborations

Throughout his career, Kazuhiko has worked alongside notable colleagues such as Kenji Matsuo and Shinji Fujii. These collaborations have fostered an environment of creativity and innovation, leading to the development of groundbreaking technologies in the field of electronics.

Conclusion

Kazuhiko Kasai's contributions to frequency multiplication and DAC technology highlight his role as a leading inventor in the electronics industry. His patents reflect a commitment to innovation and excellence, making a lasting impact on the field.