Company Filing History:
Years Active: 1988-1999
Title: Shigeru Kagawa: Innovator in Amplifier and Demodulator Technologies
Introduction
Shigeru Kagawa is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the fields of electronics and signal processing. With a total of 4 patents to his name, Kagawa continues to push the boundaries of innovation in his industry.
Latest Patents
Kagawa's latest patents include a gain-variable amplifier with a wide control range. This invention features a dual differential amplifier circuit that amplifies an input voltage to generate an output voltage, with a gain that corresponds to first and second control voltages. The control voltage generating circuit ensures that the polarity of the difference between the first and second control voltages remains unchanged when the gain control voltage is within a specified control range.
Another notable patent is a quadrature demodulator that incorporates active filters formed with emitters. This invention effectively removes unnecessary higher harmonic signals from the demodulation output without increasing the number of externally connected parts or current consumption. The quadrature demodulator includes a first double differential circuit for inputting a modulated signal and a first local signal, along with a second double differential circuit for a phase-shifted local signal. The design also features emitter follower circuits for impedance conversion and a CR circuit that forms an active filter.
Career Highlights
Shigeru Kagawa is currently employed at NEC Corporation, where he applies his expertise in electronics and signal processing. His work has led to advancements in various technologies that enhance the performance and efficiency of electronic devices.
Collaborations
Kagawa collaborates with fellow inventor Kazuo Tokuda, contributing to innovative projects and research within their field.
Conclusion
Shigeru Kagawa is a distinguished inventor whose work in amplifier and demodulator technologies has made a significant impact on the electronics industry. His innovative patents reflect his commitment to advancing technology and improving electronic systems.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.