Hong Chang Yeoh

Title: **Innovations by Hong Chang Yeoh: A Glimpse into His Patent Contributions**

Introduction

Hong Chang Yeoh, an accomplished inventor based in Seoul, South Korea, has made significant contributions to the field of digital signal processing. With a total of three patents to his name, his innovations stand out for their technical sophistication and practical application in the realm of frequency synthesizers and digital-to-analog converters.

Latest Patents

One of Yeoh's notable inventions is the **Direct Digital Frequency Synthesizer Using Hybrid Digital to Analog Converter and Synthesizing Method Thereof**. This patent presents a direct digital frequency synthesizer that utilizes a hybrid digital-to-analog converter (DAC). The innovation cleverly matches the output data from a phase accumulator to a sine wave amplitude using a combination of a non-linear DAC and a linear DAC. In this architecture, the non-linear DAC outputs a direct base point current based on certain bits from the phase accumulator, while the linear DAC generates a gradient current derived from other bits. The synthesis of these currents leads to an effective analog output.

Another significant patent by Yeoh is the **Return to Zero Digital to Analog Converter and Converting Method Thereof**. This invention improves wideband characteristics by allowing a return-to-zero output without needing a separate clock and controller. The design incorporates a switch that generates a zero point signal and utilizes a differential pipeline to supply differential signals. This innovative approach provides impressive dynamic performance and enables the converter to output RZ signals efficiently.

Career Highlights

Throughout his career, Yeoh has worked with various reputable organizations, including the Chung-Ang University Industry-Academy Cooperation Foundation and Zaram Technology Co., Ltd. These positions have allowed him to refine his technical skills and contribute to advancements in electronic circuits.

Collaborations

During his innovative journey, Hong Chang Yeoh has collaborated with esteemed colleagues, including Kwang-Hyun Baek and Jae-Hun Jung. Their partnerships have been instrumental in furthering research and development in high-performance digital signal processing technologies.

Conclusion

Hong Chang Yeoh's contributions to innovation through his patents reflect a deep understanding of digital technologies and the engineering behind them. As the industry continues to evolve, the significance of his inventions will likely inspire future advancements in digital-to-analog conversion and frequency synthesis. His dedication to research and collaboration highlights the vital role inventors play in shaping technological landscapes.