Yoshishige Nagata

Title: Innovations by Yoshishige Nagata

Introduction

Yoshishige Nagata is a notable inventor based in Hyogo, Japan. He has made significant contributions to the field of integrated circuits, particularly in the area of modulation and demodulation technologies. With a total of 2 patents, his work has had a considerable impact on the development of IC card technology.

Latest Patents

Nagata's latest patents focus on modulation, demodulation, and antenna coupling circuits used in IC cards. One of his innovations involves a modulator utilized in an IC card reader/writer. This modulator features a phase variation detector that identifies the varying point of the phase of a modulated signal. It also includes a signal processing circuit that modifies the modulated signal for a half period at the phase varying point, resulting in a frequency and amplitude that are twice those of the original modulated signal. Additionally, the design incorporates a first Miller integrator that integrates the modified signal to produce a triangular wave signal, followed by a second Miller integrator that converts the triangular wave into a sinusoidal wave signal with a continuous phase. The demodulator in the reader/writer is equipped with a sync control circuit that manages the generation of a carrier sync signal, adjusting its phase based on whether it is in lead-phase or lag-phase relative to the signal modulated using binary phase shift keying (BPSK). Furthermore, a control data signal and non-modulated carrier wave sent from the reader/writer to the IC card are converted into power for the IC card's use.

Career Highlights

Yoshishige Nagata is currently employed at Mitsubishi Electric Corporation, where he continues to innovate and develop new technologies. His expertise in integrated circuits has positioned him as a key figure in his field.

Collaborations

Nagata has collaborated with Kenichi Takahira, working together to advance their research and development efforts in the realm of IC technology.

Conclusion

Yoshishige Nagata's contributions to modulation and demodulation technologies have significantly influenced the development of IC cards. His innovative patents and ongoing work at Mitsubishi Electric Corporation highlight his importance in the field of integrated circuits.