Patents by Inventor Tie Jun Dai

Tie Jun Dai 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).

  • Missing code redistribution in pipeline analog to digital converter
    Patent number: 8648913
    Abstract: A stage of pipeline analog to digital converter (ADC) includes a multiplying digital to analog converter (MDAC) and a sub-analog to digital converter (sub-ADC). The sub-ADC includes a comparator and a random offset controller. The comparator is coupled to compare a first analog signal received by the stage with a reference signal. The random offset controller is coupled to the comparator to apply a random offset to an input of the comparator to randomly distribute errors by the sub-ADC in a digital output of the pipeline ADC.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: February 11, 2014
    Assignee: OmniVision Technologies, Inc.
    Inventors: Liping Deng, Tie Jun Dai, Bi Yuan, Chien-Chen Chen
  • MISSING CODE REDISTRIBUTION IN PIPELINE ANALOG TO DIGITAL CONVERTER
    Publication number: 20120262614
    Abstract: A stage of pipeline analog to digital converter (ADC) includes a multiplying digital to analog converter (MDAC) and a sub-analog to digital converter (sub-ADC). The sub-ADC includes a comparator and a random offset controller. The comparator is coupled to compare a first analog signal received by the stage with a reference signal. The random offset controller is coupled to the comparator to apply a random offset to an input of the comparator to randomly distribute errors by the sub-ADC in a digital output of the pipeline ADC.
    Type: Application
    Filed: April 15, 2011
    Publication date: October 18, 2012
    Applicant: OMNIVISION TECHNOLOGIES, INC.
    Inventors: Liping Deng, Tie Jun Dai, Bi Yuan, Chien-Chen Chen
  • Zero DC current readout circuit for CMOS image sensor using a discharge capacitor
    Patent number: 6864476
    Abstract: A method of reading out a light signal from a pixel is disclosed. The method comprises first charging a capacitor to a predetermined voltage during a precharge stage. Next, during a readout stage, discharging the capacitor for a predetermined length of time through a pixel output transistor. The pixel output transistor is modulated by the light signal by applying the light signal to the gate of the pixel output transistor. Finally, the output signal is determined to be the voltage held by the capacitor.
    Type: Grant
    Filed: January 30, 2004
    Date of Patent: March 8, 2005
    Assignee: OmniVision Technologies, Inc.
    Inventor: Tie Jun Dai
  • Zero DC current readout circuit for CMOS image sensor using a precharge capacitor
    Publication number: 20040182990
    Abstract: A method of reading out a light signal from a pixel is disclosed. The method comprises first charging a capacitor to a predetermined voltage during a precharge stage. Next, during a readout stage, discharging the capacitor for a predetermined length of time through a pixel output transistor. The pixel output transistor is modulated by the light signal by applying the light signal to the gate of the pixel output transistor. Finally, the output signal is determined to be the voltage held by the capacitor.
    Type: Application
    Filed: January 30, 2004
    Publication date: September 23, 2004
    Inventor: Tie Jun Dai