Young-Joung Hong

Title: Young-Joung Hong: Innovator in Frequency Synthesis

Introduction

Young-Joung Hong is a prominent inventor based in Seoul, South Korea. He has made significant contributions to the field of frequency synthesis, holding 2 patents that showcase his innovative approach to technology.

Latest Patents

One of his latest patents is a frequency synthesizer using a voltage-controlled oscillator (VCO) core of a wideband synthesizer with an integrated VCO. This frequency synthesizer employs a combination of a low divide ratio divider phase-locked loop (PLL) and a wide band, on-chip VCO. To reduce phase noise, low divide ratio phase detection is utilized. By using an off-chip PLL with a bank of on-chip VCOs, the frequency synthesizer achieves enhanced frequency stability while avoiding the need for an acquisition circuit. The separation between the PLL and VCO reduces integer boundary spurs (IBS), thereby eliminating or minimizing the need for a filter bank and switches, which simplifies the overall design of the frequency synthesizer.

Another notable patent is the dual-structure acquisition circuit for frequency synthesis. This wide band frequency synthesizer includes a primary PLL that receives a signal containing both a local signal and a VCO signal mixed together. It generates the tuning voltage based on a phase comparison of the local signal and the VCO signal. The local signal is obtained from a reference signal through frequency multiplication. If the primary PLL fails to lock onto an output frequency, a secondary PLL (acquisition circuit) can be activated to perform a phase comparison between the reference signal and the VCO signal, generating the necessary tuning voltage.

Career Highlights

Young-Joung Hong is currently employed at Viavi Solutions Inc., where he continues to develop innovative technologies in frequency synthesis. His work has significantly impacted the field, enhancing the performance and reliability of frequency synthesizers.

Collaborations

He has collaborated with notable colleagues, including Byung-Kuk An and Hyoung-Kyoun Park, contributing to various projects that push the boundaries of technology.

Conclusion

Young-Joung Hong is a distinguished inventor whose work in frequency synthesis has led to advancements that improve technology's efficiency and effectiveness. His patents reflect a deep understanding of complex systems and a commitment to innovation.