Shunsaku Ueda

Title: Innovations of Shunsaku Ueda

Introduction

Shunsaku Ueda is a notable inventor based in Carlsbad, California. He has made significant contributions to the field of technology, particularly in the area of frequency synthesizers and high-speed comparators. With a total of six patents to his name, Ueda's work showcases his innovative spirit and technical expertise.

Latest Patents

One of Ueda's latest patents is titled "Time Based Data Separator Zone Change Sequence." This invention provides a method and apparatus for controlling initial transients in a frequency synthesizer by managing the start-up sequence of the device. The start-up sequence includes several steps, such as resetting the voltage-controlled oscillator(s) (VCO) to ensure they are in a known state during start-up. The charge pump and phase detector of the phase-locked loop (PLL) are disabled, and new data values are loaded into the counters and registers that control the frequency of the VCOs. A fixed delay is provided for the digital-to-analog converter (DAC) to settle, ensuring that the VCO is already settled when changing frequencies.

Another significant patent is the "High Speed Threshold Crossing Detector with Reset." This invention features a high-speed, all CMOS comparator that utilizes positive feedback and DC voltage clamping. The circuit comprises two source-coupled PMOS transistors, with a third PMOS transistor providing positive feedback. As the negative input voltage drops below the positive input voltage, the circuit's design enhances the drive characteristics, making it highly efficient.

Career Highlights

Shunsaku Ueda has been instrumental in advancing technology through his innovative designs and patents. His work at Siliconsystems, Inc. has allowed him to collaborate with other talented engineers and contribute to cutting-edge projects.

Collaborations

Ueda has worked alongside notable colleagues such as Kwai-Kwong Lam and Craig Robertson. Their combined expertise has fostered an environment of innovation and creativity within their projects.

Conclusion

Shunsaku Ueda's contributions to technology through his patents and collaborations highlight his role as a leading inventor in the field. His innovative solutions continue to influence advancements in frequency synthesis and high-speed circuitry.