Patents by Inventor Zonggi Hu

Zonggi Hu 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).

  • SET-POINT RESOLUTION IMPROVEMENT FOR SWITCH MODE POWER SUPPLIES
    Publication number: 20120223849
    Abstract: A Digital-to-Analog Converter (DAC) produces an analog reference value from a first reference input. The analog reference value and an output value are used to produce an analog error signal. An Analog-to-Digital Converter (ADC) converts the analog error signal to a digital value. The ADC has higher level of resolution than the DAC. An error encoder adjusts the digital value to produce a digital error value using a second reference input.
    Type: Application
    Filed: March 3, 2011
    Publication date: September 6, 2012
    Applicant: EXAR CORPORATION
    Inventors: Lawrence BROWN, JASON WEINSTEIN, ZHENYU ZHAO, ZONGGI HU
  • Gray code current mode analog-to-digital converter
    Patent number: 7911366
    Abstract: One embodiment of the present invention is a Gray code current-mode analog to digital (ADC) converter using a Gray code current-mode ADC building block. The Gray code current-mode ADC building block can produce a Gray code bit and a current output that is sent to a next Gray code ADC building block. In one embodiment, the Gray code current-mode ADC building block does not use a voltage comparator in a signal path of the current output. In one embodiment, an 8 bit analog-to-digital converter can have a 65 ns conversion time and consume only 10 mW of power with a single +5.0V supply.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: March 22, 2011
    Assignee: Exar Corporation
    Inventors: Richard W. Randlett, Zonggi Hu