Junghyun Ham

Title: Junghyun Ham and His Power Amplifier Innovations.

Introduction

Junghyun Ham is an inventor associated with Suwon, South Korea. His work includes inventions in radio-frequency power amplification, particularly envelope tracking and bias modulation. He is listed as having 2 patents.

Latest Patents

Ham’s patent portfolio includes two inventions focused on adapting power amplifier bias voltages to operating conditions.

“Multi-mode bias modulator and envelope tracking power amplifier using the same” describes a system that generates an envelope-modulated bias voltage from an RF signal’s envelope. A linear amplifier and a switching amplifier adjust their current-driving capabilities according to a control signal selecting low-level or high-level operation. The resulting voltage biases the power amplifier, which amplifies the RF signal and sends it to an antenna.

“Multi mode bias modulator operating in envelope tracking mode or average power tracking mode and envelope tracking power amplifier using the same” describes a modulator that can operate in either envelope tracking mode or average power tracking mode. A control signal selects the mode, and the linear and switching amplifiers generate a variable bias voltage for the power amplifier. The amplifier then boosts the RF signal and outputs it to an antenna.

Career Highlights

Ham’s listed professional affiliations include Sungkyunkwan University and LG Display Co., Ltd. His patent work reflects an emphasis on power amplifier systems that vary bias voltage in response to signal envelopes or selected operating modes.

Collaborations

His listed collaborators include Youngoo Yang and Hearyun Jung.

Conclusion

Junghyun Ham’s inventions address adaptable bias modulation for RF power amplifiers, with designs supporting multiple operating modes and envelope-based control.