Location History:
- Yokohama, JP (1984)
- Tokyo, JP (1985 - 1986)
Company Filing History:
Years Active: 1984-1986
Title: Masafumi Kazumi: Innovator in D/A Converters and Transversal Filters
Introduction
Masafumi Kazumi is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of electronics, particularly in the development of digital-to-analog converters and transversal filters. With a total of 6 patents to his name, Kazumi's work has had a lasting impact on technology.
Latest Patents
Kazumi's latest patents include a sophisticated D/A converter. This converter comprises one or both of a first D/A converter and a second D/A converter. In the first D/A converter, multiple semiconductor devices are connected in parallel between a power supply and a load resistor. The gates of a group of these devices are connected to a common gate bias potential source. The devices that correspond to the high order bits of the input digital data are activated to supply current to the load resistor, with the voltage drop across the load resistor outputted as an analog quantity representing these high order bits. The second D/A converter utilizes a gate voltage determined by the low order bits of the input digital data to control a remaining semiconductor device, which also supplies current to the load resistor, outputting the corresponding low order bits as an analog quantity.
Another notable patent is a transversal filter that incorporates MOS-transistor amplifiers. This filter is designed for use in ghost cancellers of television receivers. The amplifiers utilize MOS transistors, each loaded by a complementary connection of a P-MOS transistor and an N-MOS transistor, forming a C-MOS transistor pair.
Career Highlights
Kazumi is currently employed at Hitachi, Ltd., where he continues to innovate and develop cutting-edge technologies. His work has been instrumental in advancing the capabilities of electronic devices, particularly in the realm of signal processing.
Collaborations
Throughout his career, Kazumi has collaborated with notable colleagues, including Toshinori Murata and Yuji Ito. These partnerships have fostered a creative environment that has led to the successful development of various technologies.
Conclusion
Masafumi Kazumi is a distinguished inventor whose contributions to the field of electronics have significantly advanced technology. His innovative patents in D/A converters and transversal filters demonstrate his expertise and commitment to excellence in engineering.
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