Liusheng Liu

Title: Innovations of Liusheng Liu in Signal Processing

Introduction

Liusheng Liu is a notable inventor based in Singapore, recognized for his contributions to the field of signal processing. He holds 2 patents that showcase his innovative approach to integrating and modulating signals. His work is particularly relevant in applications requiring low noise and high precision.

Latest Patents

One of Liu's latest patents is titled "Differential integrator having offset and gain compensation." This invention describes a fully differential switched-capacitor integrator that can accept a single-ended or unbalanced input signal. It compensates for the offset and finite gain of the operational amplifier without needing an extra converter circuit. The circuit employs a unique input structure that incorporates special capacitors to store the offset and low-frequency noise of the operational amplifier. A preferred embodiment of this invention utilizes transmission gates made from CMOS transistors, effectively preventing clock feedthrough by implementing two non-overlapping clock phases with a delayed clock. This innovation serves as an excellent alternative for applications such as low noise filters and sigma delta modulators.

Another significant patent by Liu is the "Sigma delta modulator with automatic saturation detection and recovery." This invention describes a forward feed sigma delta modulator of higher order that features automatic saturation detection and recovery. The modulator is divided into two parts that connect when there is no saturation and disconnect when saturation is detected. The first part includes an integrator and input-output circuitry to ensure continuous operation, while the second part contains additional integrators for higher order modulation and a saturation detector. This modulator can be constructed using single-ended or differential switched capacitor technology, along with a digital saturation detection scheme.

Career Highlights

Liusheng Liu is currently employed at Tritech Microelectronics, Ltd., where he continues to develop innovative solutions in the field of electronics. His work has significantly impacted the design and functionality of signal processing devices.

Collaborations

Liu has collaborated with notable colleagues such as David Ho Poh and Lee Tay Chew, contributing to various projects that enhance the capabilities of their technologies.

Conclusion

Liusheng Liu's innovative patents and contributions to signal processing demonstrate his expertise and commitment to advancing technology in this field. His work continues to influence the development of efficient and effective electronic systems.