Patents by Inventor Stephen Chi-Wang Au

Stephen Chi-Wang Au 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: 8456226
    Abstract: Certain aspects of a method and system for a process sensor to compensate SoC parameters in the presence of IC process manufacturing variations are disclosed. Aspects of one method may include determining an amount of process variation associated with at least one transistor within a single integrated circuit. The determined amount of process variation may be compensated by utilizing a process dependent current, a bandgap current, and a current associated with a present temperature of the transistor. The process dependent current, the bandgap current and the current associated with the present temperature of the transistor may be combined to generate an output current. A voltage generated across a variable resistor may be determined based on the generated output current.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: June 4, 2013
    Assignee: Broadcom Corporation
    Inventors: Stephen Chi-Wang Au, Arya Behzad, Paul Chang
  • Publication number: 20120274397
    Abstract: Certain aspects of a method and system for a process sensor to compensate SoC parameters in the presence of IC process manufacturing variations are disclosed. Aspects of one method may include determining an amount of process variation associated with at least one transistor within a single integrated circuit. The determined amount of process variation may be compensated by utilizing a process dependent current, a bandgap current, and a current associated with a present temperature of the transistor. The process dependent current, the bandgap current and the current associated with the present temperature of the transistor may be combined to generate an output current. A voltage generated across a variable resistor may be determined based on the generated output current.
    Type: Application
    Filed: July 10, 2012
    Publication date: November 1, 2012
    Applicant: BROADCOM CORPORATION
    Inventors: Stephen Chi-Wang Au, Arya Behzad, Paul Chang
  • Patent number: 8237492
    Abstract: Certain aspects of a method and system for a process sensor to compensate SoC parameters in the presence of IC process manufacturing variations are disclosed. Aspects of one method may include determining an amount of process variation associated with at least one transistor within a single integrated circuit. The determined amount of process variation may be compensated by utilizing a process dependent current, a bandgap current, and a current associated with a present temperature of the transistor. The process dependent current, the bandgap current and the current associated with the present temperature of the transistor may be combined to generate an output current. A voltage generated across a variable resistor may be determined based on the generated output current.
    Type: Grant
    Filed: December 31, 2006
    Date of Patent: August 7, 2012
    Assignee: Broadcom Corporation
    Inventors: Stephen Chi-Wang Au, Arya Behzad, Paul Chang
  • Patent number: 8093952
    Abstract: Aspects of a method and system for precise current matching in deep sub-micron technology may include adjusting a current mirror to compensate for MOSFET gate leakage currents by using feedback circuits. The feedback circuits may be implemented from active components to create active feedback circuits. If the reference current to be mirrored is noisy, a smoothing effect may be achieved by introducing a low-pass filter coupled to the current mirror design. The active feedback may comprise amplifiers, which may comprise one or more amplifier stages. The amplifier may amplify either a bias voltage error or a bias current error. Furthermore, a transimpedance amplifier may be utilized in the feedback loop. The output bias current of the current mirror may be stabilized dynamically during adjusting. Multiple current sources may be utilized in the current mirrors.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: January 10, 2012
    Assignee: Broadcom Corporation
    Inventors: Arya Behzad, Stephen Chi-Wang Au, Dandan Li
  • Publication number: 20080157875
    Abstract: Aspects of a method and system for precise current matching in deep sub-micron technology may include adjusting a current mirror to compensate for MOSFET gate leakage currents by using feedback circuits. The feedback circuits may be implemented from active components to create active feedback circuits. If the reference current to be mirrored is noisy, a smoothing effect may be achieved by introducing a low-pass filter coupled to the current mirror design. The active feedback may comprise amplifiers, which may comprise one or more amplifier stages. The amplifier may amplify either a bias voltage error or a bias current error. Furthermore, a transimpedance amplifier may be utilized in the feedback loop. The output bias current of the current mirror may be stabilized dynamically during adjusting. Multiple current sources may be utilized in the current mirrors.
    Type: Application
    Filed: December 29, 2006
    Publication date: July 3, 2008
    Inventors: Arya Behzad, Stephen Chi-Wang Au, Dandan Li
  • Publication number: 20080136503
    Abstract: Certain aspects of a method and system for a process sensor to compensate SoC parameters in the presence of IC process manufacturing variations are disclosed. Aspects of one method may include determining an amount of process variation associated with at least one transistor within a single integrated circuit. The determined amount of process variation may be compensated by utilizing a process dependent current, a bandgap current, and a current associated with a present temperature of the transistor. The process dependent current, the bandgap current and the current associated with the present temperature of the transistor may be combined to generate an output current. A voltage generated across a variable resistor may be determined based on the generated output current.
    Type: Application
    Filed: December 31, 2006
    Publication date: June 12, 2008
    Inventors: Stephen Chi-Wang Au, Arya Behzad, Paul Chang