Company Filing History:
Years Active: 2002-2005
Title: Huan-Chang Liu: Innovator in Variable Rate Modulation
Introduction
Huan-Chang Liu is a prominent inventor based in Irvine, California. He has made significant contributions to the field of variable rate modulation, holding three patents to his name. His work is characterized by innovative approaches to signal processing and modulation techniques.
Latest Patents
One of Huan-Chang Liu's latest patents involves a variable rate modulator. In this invention, clock signals and digital data signals at a variable frequency are introduced to the input of a FIFO (First In, First Out) buffer. These signals are then passed from the FIFO at a second frequency, which is controlled by a numerically controlled oscillator. To ensure the accuracy of the frequency, the phases of the clock signals are compared in a phase detector with the phases of the signals from the oscillator, generating an error signal. This error signal, along with fixed sampling frequency signals, regulates the frequency of the digital data signals from the FIFO. The digital data signals are converted into a pair of signals at the second frequency, which modulate a pair of trigonometrically related signals at the fixed sampling frequency. The combined signals are then sampled to produce corresponding analog values through a digital-to-analog converter.
Career Highlights
Huan-Chang Liu is currently employed at Broadcom Corporation, a leading technology company known for its innovations in semiconductors and telecommunications. His work at Broadcom has allowed him to further develop his expertise in signal processing and modulation technologies.
Collaborations
Throughout his career, Huan-Chang Liu has collaborated with notable colleagues, including Robert A. Hawley and Robindra B. Joshi. These collaborations have contributed to the advancement of technology in their respective fields.
Conclusion
Huan-Chang Liu's contributions to variable rate modulation and his innovative patents highlight his role as a significant inventor in the technology sector. His work continues to influence advancements in signal processing and modulation techniques.