Patents by Inventor Ju Hyeon Song

Ju Hyeon Song 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).

  • Semiconductor memory having a negative voltage generator for an erasing operation
    Patent number: 6166968
    Abstract: A voltage supply generator for a semiconductor memory improves the reliability of the erasing operation. A Vcc voltage detecting unit detects an intensity of a Vcc voltage, which is an external power source, to provide first and second Vcc voltages. A charge pump circuit receives the Vcc voltage and provides a VNEG voltage. A clock circuit applies a clock pulse to the charge pump circuit. A voltage regulating circuit receives the first and second Vcc voltages to monitor and control the VNEG voltage and provides a constant VNEG voltage.
    Type: Grant
    Filed: March 29, 1999
    Date of Patent: December 26, 2000
    Assignee: Hyundai Electronics Industries Co., Ltd.
    Inventor: Ju Hyeon Song