Hitoshi Yamada

Title: Hitoshi Yamada: Semiconductor Power and Cleaning Innovations.

Introduction

Hitoshi Yamada is an inventor based in Tokyo, Japan. His listed portfolio includes 3 patents, with recent work addressing power regulation and cleaning processes for semiconductor-manufacturing equipment.

Latest Patents

Yamada’s “Step-down power supply” invention is designed to provide a load with a reduced voltage derived from an external power supply. It uses a reference voltage and a control signal indicating whether the load is active. The design helps keep the output voltage stable during transitions between active and inactive states by adjusting an internal control node. Described approaches include pulling that node up or down, leaking current from the output to ground, temporarily changing the reference voltage, or coupling the reference-voltage and control-signal lines with a capacitor.

His “Cleaning fluid and cleaning method for component of semiconductor-treating apparatus” invention concerns removing byproducts formed from decomposed process gases containing carbon and fluorine. The specified cleaning solution contains 75 wt% N-methyl-2-pyrrolidone, 15 wt% ethylene glycol monobutyl ether, 0.5 wt% surfactant, and 9.5 wt% water. Its alkali-metal content is kept below 10 ppb.

Career Highlights

The available information identifies Yamada’s location and patent count but does not specify his employer or provide further career details. His described inventions focus on practical challenges in semiconductor-related technology, including stable power delivery and equipment cleaning.

Collaborations

Nobuyuki Nagayama and Eiji Yamaguchi are listed as Yamada’s coworkers. The available information does not specify their roles in the patents.

Conclusion

Hitoshi Yamada’s listed inventions address voltage stability and cleaning requirements in semiconductor applications, reflecting a portfolio focused on technical needs in electronic systems and manufacturing.