Patents by Inventor Chester Leung

Chester Leung 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: 6801416
    Abstract: Electrostatic discharge (ESD) protection for circuits which utilize multiple power supply rails, both positive (Vdd) and negative (Vss). Vdd busses remain completely isolated, while Vss busses are joined by pairs of complementary polarity diodes (made typically with P+/N-well diodes in an N/P-substrate process) thus keeping Vss busses isolated from each other. The I/O diodes of high frequency I/O pads are arranged in a square layout to achieve the best current/capacitance ratio. Each pair of power rails is provided with its own power shunt circuit, placing each shunt in physical proximity to the I/O pad it must protect. Shunts are designed to clamp at a very low voltage during an ESD event using mostly PMOS transistors. The protection circuit is laid out such that the worst case ESD event will flow at most between two I/O pads and one power shunt.
    Type: Grant
    Filed: August 23, 2001
    Date of Patent: October 5, 2004
    Assignee: Institute of Microelectronics
    Inventors: Mark Hatzilambrou, Chester Leung, Rajan Walia, Lien Wee Liang, Subhash C. Rustagi, M K Radhakrishnan
  • Patent number: 6534374
    Abstract: A method of integrated circuit component integration in copper interconnects, including the following steps of the first embodiment. A wafer is provided having an exposed top-most planar copper interconnect. The wafer being divided into one or more areas selected from the group consisting of: a spiral inductor area having an exposed planar copper interconnect bottom half of a stacked spiral inductor; a MIM capacitor area having an exposed planar copper interconnect bottom plate and an exposed planar copper interconnect contact point of a MIM capacitor; and a precision resistor area having a two exposed planar copper interconnect routing points of a precision resistor. A spiral inductor is formed within the spiral inductor area; a MIM capacitor is formed within the MIM capacitor area; and a precision resistor is formed within the precision resistor area.
    Type: Grant
    Filed: June 7, 2001
    Date of Patent: March 18, 2003
    Assignee: Institute of Microelectronics
    Inventors: Eric Johnson, Chester Leung, Bo Yu, Yin Qian, Mark Hatzilambrou, My The Doan
  • Publication number: 20030039084
    Abstract: Electrostatic discharge (ESD) protection for circuits which utilize multiple power supply rails, both positive (Vdd) and negative (Vss). Vdd busses remain completely isolated, while Vss busses are joined by pairs of complementary polarity diodes (made typically with P+/N-well diodes in an N/P-substrate process) thus keeping Vss busses isolated from each other. The I/O diodes of high frequency I/O pads are arranged in a square layout to achieve the best current/capacitance ratio. Each pair of power rails is provided with its own power shunt circuit, placing each shunt in physical proximity to the I/O pad it must protect. Shunts are designed to clamp at a very low voltage during an ESD event using mostly PMOS transistors. The protection circuit is laid out such that the worst case ESD event will flow at most between two I/O pads and one power shunt.
    Type: Application
    Filed: August 23, 2001
    Publication date: February 27, 2003
    Applicant: Institute of Microelectronics
    Inventors: Mark Hatzilambrou, Chester Leung, Rajan Walia, Lien Wee Liang, Subhash C. Rustagi, MK Radhakrishnan
  • Publication number: 20020197844
    Abstract: A method of integrated circuit component integration in copper interconnects, including the following steps of the first embodiment. A wafer is provided having an exposed top-most planar copper interconnect. The wafer being divided into one or more areas selected from the group consisting of: a spiral inductor area having an exposed planar copper interconnect bottom half of a stacked spiral inductor; a MIM capacitor area having an exposed planar copper interconnect bottom plate and an exposed planar copper interconnect contact point of a MIM capacitor; and a precision resistor area having a two exposed planar copper interconnect routing points of a precision resistor. A spiral inductor is formed within the spiral inductor area; a MIM capacitor is formed within the MIM capacitor area; and a precision resistor is formed within the precision resistor area.
    Type: Application
    Filed: June 7, 2001
    Publication date: December 26, 2002
    Applicant: Institute of Microelectronics
    Inventors: Eric Johnson, Chester Leung, Bo Yu, Yin Qian, Mark Hatzilambrou, My The Doan