Patents by Inventor Jae-Ah CHA

Jae-Ah CHA 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).

  • ESD protection circuit for I/O buffer
    Patent number: 11431165
    Abstract: An ESD protection circuit for an input/output buffer in which when an ESD pulse or event occurs, an ESD surge on a pad is discharged to a diode and a transistor channel, thereby enhancing the efficiency of the ESD protection circuit. The ESD protection circuit includes a floating N-well bias circuit connected to a pad at an output of driver circuit and outputting a bias voltage based on or in response to a supply voltage; a switch circuit connected to a logic circuit and the driver circuit, and configured to connect and disconnect the logic circuit and the driver circuit based on or in response to the supply voltage; and a pull-down circuit connected to the driver circuit, configured to output a voltage to the driver circuit based on or in response to the supply voltage.
    Type: Grant
    Filed: August 21, 2020
    Date of Patent: August 30, 2022
    Assignee: DB HiTek, Co., Ltd.
    Inventors: Sang-Mok Lee, Joon-Tae Jang, Seung-Hoo Kim, Jae-Ah Cha
  • ESD PROTECTION CIRCUIT FOR I/O BUFFER
    Publication number: 20210281066
    Abstract: An ESD protection circuit for an input/output buffer in which when an ESD pulse or event occurs, an ESD surge on a pad is discharged to a diode and a transistor channel, thereby enhancing the efficiency of the ESD protection circuit. The ESD protection circuit includes a floating N-well bias circuit connected to a pad at an output of driver circuit and outputting a bias voltage based on or in response to a supply voltage; a switch circuit connected to a logic circuit and the driver circuit, and configured to connect and disconnect the logic circuit and the driver circuit based on or in response to the supply voltage; and a pull-down circuit connected to the driver circuit, configured to output a voltage to the driver circuit based on or in response to the supply voltage.
    Type: Application
    Filed: August 21, 2020
    Publication date: September 9, 2021
    Inventors: Sang-Mok LEE, Joon-Tae JANG, Seung-Hoo KIM, Jae-Ah CHA