Patents by Inventor Kwok-F Chiu

Kwok-F Chiu 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).

  • Circuit for generating a process variation insensitive reference bias current
    Patent number: 5469111
    Abstract: In a comparator circuit, a reference bias current generation circuit uses an MOS transistor rather than a resistor to generate a current based on the difference between the base-emitter voltages of two bipolar transistors. In one embodiment, a second MOS transistor matched to the first MOS transistor is used to provide a current substantially independent of variations of the threshold voltage due to variations in the manufacturing process. A reference voltage source is provided to adjust the temperature coefficient of the reference bias current.
    Type: Grant
    Filed: August 24, 1994
    Date of Patent: November 21, 1995
    Assignee: National Semiconductor Corporation
    Inventor: Kwok-F Chiu