Location History:
- Yokosuka, JP (2002 - 2003)
- Kanagawa, JP (2004)
Company Filing History:
Years Active: 2002-2004
Title: Ryoichi Yamada: Innovator in Frequency Synthesis Technology
Introduction
Ryoichi Yamada is a notable inventor based in Yokosuka, Japan. He has made significant contributions to the field of frequency synthesis technology, holding a total of 3 patents. His work has been instrumental in advancing wireless communication systems.
Latest Patents
Yamada's latest patents include a "Fractional-N frequency synthesizer with multiple clocks having different timings." This invention features a frequency synthesizer device that comprises a PLL circuit and a frequency-division ratio control circuit. The PLL circuit includes a phase comparator, a low-pass filter, a voltage-controlled oscillator, and a variable frequency divider. The frequency-division ratio control circuit adjusts the variable frequency divider to change its frequency division ratio over time, ensuring that the average value remains below a decimal point. This innovation reduces variations in substrate potential and power supply voltage, thereby suppressing degradation in the frequency synthesizer's C/N ratio.
Another significant patent is the "Method and apparatus for synthesizing high-frequency signals for wireless communications." This frequency synthesizer is equipped with a prescaler and a counter that output a signal generated by frequency-dividing the output of a VCO. The device includes a reference frequency divider and a frequency adjusting mechanism that detects frequency errors and adjusts the resonant circuit of the VCO accordingly. This allows for phase-locking at desirable frequencies while enabling cost-effective manufacturing of compact VCOs in IC form.
Career Highlights
Ryoichi Yamada is currently employed at Matsushita Electric Industrial Co., Ltd., where he continues to innovate in the field of frequency synthesis. His work has garnered attention for its practical applications in wireless communication technologies.
Collaborations
Yamada has collaborated with notable coworkers such as Shunsuke Hirano and Yasunori Miyahara. Their combined expertise has contributed to the successful development of advanced frequency synthesizer technologies.
Conclusion
Ryoichi Yamada's contributions to frequency synthesis technology have made a significant impact on the field of wireless communications. His innovative patents reflect his dedication to advancing technology and improving communication systems.