Masaru Sawada

Title: **Masaru Sawada: Innovator in PLL and Transmitting/Receiving Circuit Technologies**

Introduction

Masaru Sawada, based in Kawasaki, Japan, is a prominent inventor with a remarkable portfolio of 23 patents. His innovative contributions primarily lie in the realms of phase-locked loops (PLLs) and transmitting and receiving circuit technologies, demonstrating a profound understanding of electronic engineering and design.

Latest Patents

Among his latest inventions, Sawada's PLL patent introduces a sophisticated charge-pump equalizer. This innovative component features multiple charge pumps that generate charge currents based on phase-difference signals. Each charge pump operates by delaying the phase-difference signal by varying times, augmenting the overall efficiency in generating and outputting charge currents. Furthermore, his PLL includes a replica circuit designed to emulate the ideal characteristics of a loop filter and a voltage-controlled oscillator, producing outputs based on digital values reflecting phase differences. The coefficient generating circuit enhances this process by smoothing correlation values of difference signals and feeding back charge pump coefficients, ensuring precise control over the charge currents generated.

In addition, Sawada's transmitting and receiving circuit patent delineates a comprehensive architecture. This circuit incorporates an amplifier for transmission signals and another for received signals, both linked to a common antenna. It features first and second matching circuits that optimize the connection between the antenna and the amplifiers. Additionally, both a first and second current source circuit regulate operating states, ensuring precise voltage settings at connection points, thereby improving functionality across communication systems.

Career Highlights

Masaru Sawada has made significant strides in his career, especially during his tenures at renowned companies such as Fujitsu Corporation and Fujitsu VLSI Limited. He has utilized his expertise in electronic systems to develop cutting-edge technologies that contribute to the evolution of communication methods in the digital age.

Collaborations

Throughout his career, Sawada has collaborated with esteemed colleagues like Takao Sugawara and Toshihiko Morita. These partnerships have likely fostered creativity and innovation, allowing for the development of advanced technologies that address the complex challenges of electronic communications.

Conclusion

Masaru Sawada stands out as a key figure in the realm of electronic innovations, particularly in PLL and circuit design. With 23 patents to his name, his contributions continue to influence the field significantly, making him a notable inventor in today's technological landscape. His work and collaborations exemplify how dedicated professionals can lead advancements that shape future innovations.