Company Filing History:
Years Active: 2011-2014
Title: Gang Qian: Innovator in Amplifier Technology
Introduction
Gang Qian is a notable inventor based in Hong Kong, China. He has made significant contributions to the field of electronics, particularly in amplifier technology. With a total of 4 patents to his name, Qian's work showcases his innovative approach to solving complex engineering challenges.
Latest Patents
One of Gang Qian's latest patents is focused on DC offset cancellation for a multi-stage amplifier. This invention provides a multi-stage amplifier that incorporates DC offset cancellation. The amplifier consists of a series of gain stages, each featuring a differential amplifier unit that generates differential outputs from differential inputs. Notably, a trailing stage includes a digital DC offset cancellation module designed to compensate for the DC offset of the trailing stage's differential amplifier unit. This module utilizes a comparator that receives the differential outputs as inputs, ensuring that the inherent DC offset is minimal. Additionally, a non-trailing stage of the amplifier is equipped with an analog DC offset cancellation module for further compensation.
Another significant patent by Qian is a Gm-C filter tuning circuit based on a relaxation oscillator. This oscillator generates first and second oscillation signals and includes a reference-voltage providing circuit that supplies high and low reference voltages. The design features switches that direct these voltages to a transconductance amplifier and a comparator. The transconductance amplifier produces an output current determined by its transconductance value, controlled by an input tuning voltage. The comparator generates digital control signals that correspond to the oscillation signals, achieving accurate frequency tuning independent of the reference voltages.
Career Highlights
Gang Qian is currently associated with the Hong Kong Applied Science and Technology Research Institute Company Limited. His work at this institution has allowed him to explore and develop innovative technologies that contribute to advancements in the field of electronics.
Collaborations
Some of his notable coworkers include Shuzuo Lou and Wai Po Wong. Their collaborative efforts have likely contributed to the success of various projects and innovations within their research environment.
Conclusion
Gang Qian's contributions to amplifier technology and his innovative patents reflect his expertise and dedication to advancing electronic engineering. His work continues to influence the field and inspire future innovations.