Patents by Inventor Kevin Tunghai Chan

Kevin Tunghai Chan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8867352
    Abstract: Systems and methods are used to adjust, e.g., reduce, current driving a transmitter, i.e., to reduce transmitter power consumption, based on an actual value of a received signal from received along a cable. For example, this is very beneficial to an Ethernet system where the received signal is attenuated by the lossy cable. In this case, the transmitter power consumption can be lowered during a normal application where data is transmitted and received through the cable.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: October 21, 2014
    Assignee: Broadcom Corporation
    Inventors: Derek Tam, Kevin Tunghai Chan
  • Patent number: 8165133
    Abstract: Switching between communication ports of a notebook is typically accomplished using an off-chip local area network (LAN) switch or an off-chip high speed analog multiplexer. This off-chip component is disadvantageous for several reasons, including: added cost of an additional component; increased overall power consumption because transmit amplitude loss; and reduced cable reach and link performance due to hybrid mismatch and signal distortions. To reduce cost and preserve electrical and networking performance, an integrated switch is provided to multiplex signals of a networking communication chip to multiple network paths.
    Type: Grant
    Filed: April 19, 2007
    Date of Patent: April 24, 2012
    Assignee: Broadcom Corporation
    Inventor: Kevin Tunghai Chan
  • Publication number: 20110158137
    Abstract: Systems and methods are used to adjust, e.g., reduce, current driving a transmitter, i.e., to reduce transmitter power consumption, based on an actual value of a received signal from received along a cable. For example, this is very beneficial to an Ethernet system where the received signal is attenuated by the lossy cable. In this case, the transmitter power consumption can be lowered during a normal application where data is transmitted and received through the cable.
    Type: Application
    Filed: April 29, 2010
    Publication date: June 30, 2011
    Applicant: Broadcom Corporation
    Inventors: Derek TAM, Kevin Tunghai Chan
  • Patent number: 7884639
    Abstract: An apparatus and system are provided to adjust an output voltage of an integrated circuit (IC) die. For instance, the apparatus can include an on-chip source termination and a bias generator. The bias generator can be configured to provide a source current to the on-chip source termination to adjust the output voltage. In particular, when adjusting the output voltage of the IC die, the bias generator can adjust the source current using a first current with a first adjustable current gain and a second current source with a second adjustable current gain.
    Type: Grant
    Filed: July 10, 2009
    Date of Patent: February 8, 2011
    Assignee: Broadcom Corporation
    Inventor: Kevin Tunghai Chan
  • Patent number: 7576587
    Abstract: A communication system includes an integrated circuit (IC) die having an on-chip source termination. The on-chip source termination can be a non-precision resistor, such as an unsilicided poly resistor, or any other suitable termination. As compared to an off-chip source termination, the on-chip source termination can reduce voltage peaking and/or voltage overshoot in the IC die and/or at a load that is connected to the IC die. The IC die can further include a line driver to provide a source current. A bias generator can be included to provide a bias current to the line driver. The bias generator can include a first current source coupled to an off-chip resistor and a second current source coupled to an on-chip resistor. An output voltage of the IC die can be adjusted by manipulating a trim control of the off-chip resistor and/or a trim control of the on-chip resistor.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: August 18, 2009
    Assignee: Broadcom Corporation
    Inventor: Kevin Tunghai Chan
  • Publication number: 20080151930
    Abstract: Switching between communication ports of a notebook is typically accomplished using an off-chip local area network (LAN) switch or an off-chip high speed analog multiplexer. This off-chip component is disadvantageous for several reasons, including: added cost of an additional component; increased overall power consumption because transmit amplitude loss; and reduced cable reach and link performance due to hybrid mismatch and signal distortions. To reduce cost and preserve electrical and networking performance, an integrated switch is provided to multiplex signals of a networking communication chip to multiple network paths.
    Type: Application
    Filed: April 19, 2007
    Publication date: June 26, 2008
    Applicant: Broadcom Corporation
    Inventor: Kevin Tunghai Chan