Toyonobu Yamada

Title: The Innovative Contributions of Toyonobu Yamada

Introduction

Toyonobu Yamada is a prominent inventor based in Kawasaki, Japan. He has made significant contributions to the field of semiconductor technology, holding a total of five patents. His work has been instrumental in advancing methods for testing semiconductor wafers, which are crucial components in modern electronics.

Latest Patents

One of Yamada's latest patents is a semiconductor wafer testing method with probe pin contact. This method includes a pre-test step for forming a temporary test film on the surface of a semiconductor wafer. The test step involves testing the semiconductor wafer by applying a probe to the temporary test film. Finally, a post-test step is included for exfoliating the temporary test film from the surface of the semiconductor wafer. The temporary test film consists of test electrode groups, each equipped with multiple regularly arranged test electrodes and wiring patterns that connect the test electrodes with corresponding semiconductor unit electrodes on the wafer.

Another notable patent is a reference voltage generating circuit that includes a step-down circuit outputting a reference voltage from a step-up voltage. This semiconductor integrated circuit device features a step-up circuit that steps up the reference voltage within a range lower than an external power supply voltage. It also includes a step-down circuit that steps down the external power supply voltage to output a step-down voltage equal to the reference voltage, which is then used as the power supply voltage for the internal circuit.

Career Highlights

Throughout his career, Toyonobu Yamada has worked with leading companies in the technology sector, including Fujitsu Corporation and Fujitsu VLSI Limited. His experience in these organizations has allowed him to develop and refine his innovative ideas in semiconductor technology.

Collaborations

Yamada has collaborated with notable individuals in the field, including Masataka Mizukoshi and Hidehiko Akasaki. These collaborations have contributed to the advancement of semiconductor technologies and have fostered a spirit of innovation within the industry.

Conclusion

Toyonobu Yamada's contributions to semiconductor technology through his patents and collaborations highlight his role as a significant inventor in the field. His innovative methods for testing semiconductor wafers and developing reference voltage generating circuits continue to influence the industry.