Masakatsu Yokota

Title: **Masakatsu Yokota: A Pioneer in Semiconductor Innovations**

Introduction

Masakatsu Yokota, an esteemed inventor based in Takasaki, Japan, has contributed significantly to the field of semiconductor technology. With a total of three patents to his name, he has made strides in integrated circuit design, particularly in implementing innovative features that enhance performance and efficiency.

Latest Patents

Among Yokota’s notable inventions is a **semiconductor integrated circuit having a built-in PLL circuit**. This patent describes a semiconductor integrated circuit equipped with a built-in Phase-Locked Loop (PLL) circuit. The circuit features two charge pump circuits designed to charge and discharge capacitive elements of a loop filter in response to signals generated by a phase comparator circuit. One of the charge pump circuits incorporates current sources that produce smaller current values compared to those from the other charge pump circuit. The loop filter consists of a first capacitive element connected to a charge/discharge node and a second capacitive element connected through a resistive element. This design allows the first capacitive element to be charged and discharged by one charge pump circuit while the second capacitive element operates through the other charge pump circuit. Notably, the charging current source of the one charge pump circuit operates simultaneously with the discharging current source of the other, enabling the charge pump circuits to function in opposite phases.

Career Highlights

Masakatsu Yokota has held pivotal roles in reputable companies that include Renesas Technology Corporation and Epoch Microelectronics, Inc. His expertise in semiconductor technology has been instrumental in driving innovation in those organizations.

Collaborations

Throughout his career, Yokota has collaborated with esteemed colleagues, including Yasuyuki Kimura and Satoshi Shimizu. These partnerships have facilitated the exchange of ideas and furthered advancements in semiconductor research and development.

Conclusion

Masakatsu Yokota's contributions to semiconductor technology underscore his status as an influential inventor in the industry. His innovative work, particularly on integrated circuits and PLL circuits, has paved the way for advancements that drive modern electronic devices. Through his patents and collaborations, he continues to inspire future generations of inventors and engineers in the field.