Patents by Inventor Yunfu Yang

Yunfu Yang 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).

  • LOW-LOSS IMPEDANCE-MATCHED SOURCE-FOLLOWER FOR REPEATING OR SWITCHING SIGNALS ON A HIGH SPEED LINK
    Publication number: 20100066410
    Abstract: Switching and repeating applications using an impedance matched source follower improve performance of high speed links such as PCI Express, HDMI, DisplayPort and DVI by reducing attenuation and other degradation of high speed signals, including those with transmit pre-emphasis, by avoiding impedance discontinuities over process, voltage and temperature variations and by driving a broader range of loads, e.g., heavily capacitive loads. A circuit for switching or repeating signals on a single-ended or differential high speed link may comprise a source follower with input and output impedances matched to input and output transmission lines on the high speed link. The source follower is biased by a constant transconductance circuit, an external calibration circuit or other circuit to provide an essentially constant output impedance over process, voltage and temperature variations.
    Type: Application
    Filed: September 15, 2008
    Publication date: March 18, 2010
    Inventors: Yunfu Yang, Shengyuan Zhang, Yu Min Zhang, Shoujun Wang
  • Low-loss impedance-matched source-follower for repeating or switching signals on a high speed link
    Patent number: 7679395
    Abstract: Switching and repeating applications using an impedance matched source follower improve performance of high speed links such as PCI Express, HDMI, DisplayPort and DVI by reducing attenuation and other degradation of high speed signals, including those with transmit pre-emphasis, by avoiding impedance discontinuities over process, voltage and temperature variations and by driving a broader range of loads, e.g., heavily capacitive loads. A circuit for switching or repeating signals on a single-ended or differential high speed link may comprise a source follower with input and output impedances matched to input and output transmission lines on the high speed link. The source follower is biased by a constant transconductance circuit, an external calibration circuit or other circuit to provide an essentially constant output impedance over process, voltage and temperature variations.
    Type: Grant
    Filed: September 15, 2008
    Date of Patent: March 16, 2010
    Assignee: Integrated Device Technology, Inc.
    Inventors: Yunfu Yang, Shengyuan Zhang, Yu Min Zhang, Shoujun Wang