Company Filing History:
Years Active: 1987-1991
Title: Innovations of Sun-Shiu D Chan
Introduction
Sun-Shiu D Chan is a notable inventor based in Kanata, Canada. He has made significant contributions to the field of digital technology, particularly in the development of innovative circuits and filters. With a total of 2 patents, Chan's work reflects a deep understanding of electronic systems and their applications.
Latest Patents
One of Chan's latest patents is a scaler for synchronous digital clocks. This scaler comprises a plurality of flip-flops that vary their frequency division to correct phase by 0.5 clock cycle. Each flip-flop is continuously and synchronously responsive to either a rising or a falling edge of the clock pulses. Normally, the scaler's state transits along one of two loops, generating output pulses with identical repetition rates. When a control signal is applied, the scaler's state transitions from one loop to the other, generating at least one output at an alternative repetition rate. This alternative repetition rate can be either lower or higher than the identical repetition rate by an integral number of half cycles of the input clock pulses. With two control signals, a lower or higher alternative repetition rate can be selected. The design ensures that there is no jitter, improving the scaler's robustness, and effectively halving the clock frequency.
Another significant patent by Chan is an analog circuit improvement in digital integrated circuit technology. This innovation features a CMOS integrated filter that includes a passive network of resistive and capacitive paired elements along with a first differential amplifier. This setup implements a second-order low pass filter function. A second amplifier is connected in a voltage-following configuration at the input of the first amplifier, providing a filter output from the second amplifier.
Career Highlights
Chan is currently employed at Northern Telecom Limited, where he continues to push the boundaries of technology through his innovative designs. His work has been instrumental in enhancing the performance and reliability of digital systems.
Collaborations
Throughout his career, Chan has collaborated with notable colleagues, including Thomas N Little and Lorenzo L Longo. These partnerships have contributed to the advancement of his projects and the successful implementation of his inventions.
Conclusion
Sun-Shiu D Chan's contributions to the field of digital technology through his patents demonstrate his expertise and innovative spirit. His work continues to influence the development of electronic systems, showcasing the importance of creativity in engineering.