Patents by Inventor Yun H. Choi

Yun H. Choi 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).

  • Level shifter for an input/output bus in a CMOS dynamic ram
    Patent number: 4860257
    Abstract: A level shifter for an input/output bus in a CMOS dynamic RAM employs a first and second PMOS transistor. The first and second PMOS transistors are connected to and cut off a current flow between a pair of input/output lines and a pair of input/output sense amplifier input lines which are connected to input/output sense amplifiers. First and second inverters are included for each of the first and second PMOS transistors, each inverter has an input for receiving a signal for a selection of the input/output line pair and has a respective output which is connected to a corresponding gate and drain of the first and second PMOS transistors.
    Type: Grant
    Filed: November 25, 1987
    Date of Patent: August 22, 1989
    Assignee: Samsung Semiconductor and Telecommunications Co., Ltd.
    Inventor: Yun H. Choi