Kazuhisa Hirai

Title: Kazuhisa Hirai: Successive-Approximation ADC Innovation

Introduction

Kazuhisa Hirai is an inventor associated with Megachips Corporation in Osaka, Japan. His patent work includes a successive-approximation analog-to-digital converter designed to improve conversion speed while limiting circuit growth.

Latest Patents

Hirai’s listed patent, “Successive-approximation analog-to-digital converter,” describes an ADC with a capacitor digital-to-analog converter (CDAC), a comparator, and logic that produces a digital output from an analog input. The CDAC combines a main capacitor bank with an auxiliary bank that supplies corrected capacitance values. A correction-designation circuit selects among pre-correction values based on comparator bit signals and calculates updated correction values. The invention aims to accelerate operation without substantially increasing circuit size. Hirai is associated with 1 patent.

Career Highlights

Hirai’s disclosed invention addresses circuit design and conversion performance in analog-to-digital systems. His work is associated with Megachips Corporation, a company involved in semiconductor technology.

Collaborations

Shingo Adachi is identified as Hirai’s coworker. The available information does not specify their particular collaboration on the patent.

Conclusion

Kazuhisa Hirai’s patent describes a correction-capacitance approach for improving successive-approximation ADC speed while controlling circuit size, reflecting his contribution to semiconductor innovation.