Yasuaki Sumi

Title: Yasuaki Sumi: Innovator in Phase Locked Loop Circuits

Introduction

Yasuaki Sumi is a notable inventor based in Tottori, Japan. He has made significant contributions to the field of electronics, particularly in the development of phase locked loop (PLL) circuits. With a total of 11 patents to his name, Sumi's work has had a lasting impact on the industry.

Latest Patents

One of Sumi's latest patents is a phase locked loop circuit with selectable variable frequency dividers. This innovative PLL circuit includes a reference signal generating unit that produces reference signals of different phases. It also features variable frequency dividers that divide the frequency of the output signal from a voltage-controlled oscillator (VCO), thereby generating feedback signals. A phase comparator is employed to compare the phase of each feedback signal with the corresponding reference signal, outputting phase comparison signals. When the output signal is synchronized with a preset frequency signal, at least one variable frequency divider is activated while the others are halted.

Another significant patent by Sumi is a phase locked loop circuit that incorporates main and auxiliary frequency dividers along with multiple phase comparisons. This PLL circuit generates several reference signals with differing phases and includes a main frequency divider that divides the output signal of a VCO by a specific frequency-division ratio. An auxiliary frequency divider further divides the output of the main frequency divider, distributing the output as multiple feedback signals. Phase comparators then compare the reference signals with the feedback signals to produce error signals. Each frequency divider is designed as a variable frequency divider or a counter.

Career Highlights

Throughout his career, Yasuaki Sumi has worked with prominent companies such as Tottori Sanyo Electric Co., Ltd. and Sanyo Electric Co., Ltd. His experience in these organizations has allowed him to refine his skills and contribute to various innovative projects.

Collaborations

Sumi has collaborated with several professionals in his field, including Norio Morimoto. Their joint efforts have led to advancements in electronic circuit design and technology.

Conclusion

Yasuaki Sumi's contributions to the field of electronics, particularly in phase locked loop circuits, demonstrate his innovative spirit and technical expertise. His patents reflect a deep understanding of complex electronic systems, making him a significant figure in the industry.