Company Filing History:
Years Active: 2022-2024
Title: The Innovations of Ruifeng Liu
Introduction
Ruifeng Liu is an accomplished inventor based in Irvine, CA. He has made significant contributions to the field of radio frequency technology, holding a total of 3 patents. His work focuses on enhancing power amplifier efficiency and performance, which is crucial in various electronic applications.
Latest Patents
One of Liu's latest patents is a Radio Frequency Power Amplifier. This class-D RF power amplifier architecture features duty cycle control, which improves power efficiency while suppressing even-order harmonics. The design includes an integrated inductor and capacitor low pass filter, which further suppresses harmonics and provides impedance transformation between the amplifier and load. This innovation simplifies the design process for customers and reduces their bill of materials costs. Additionally, the low pass filter can match the power amplifier to the load impedance, enhancing overall efficiency. The harmonic levels can be controlled by adjusting the duty cycle of the amplifier's output.
Another notable patent is the Digitally Modulated Polar Power Amplifier. This device utilizes a thin-oxide amplifying transistor with a protection diode. The polar power amplifier includes a driver amplifier that receives a phase-modulated signal with a constant envelope, amplifying it for the output stage. This design, which employs only a single thin-oxide transistor, leads to improved efficiency compared to systems requiring a thick-oxide transistor. The protection diode limits the output to the sum of the supply voltage and the forward voltage of the diode. Amplitude modulation is achieved by dynamically turning the digital power amplifier on and off via an amplitude control word input signal.
Career Highlights
Ruifeng Liu is currently employed at Inplay, Inc., where he continues to innovate in the field of power amplification. His work has garnered attention for its practical applications and efficiency improvements.
Collaborations
Liu collaborates with Russell Mohn, a fellow professional in the industry. Their combined expertise contributes to the advancement of technology in their field.
Conclusion
Ruifeng Liu's contributions to radio frequency technology through his innovative patents demonstrate his commitment to enhancing efficiency in power amplification. His work continues to impact the industry positively.