Patents by Inventor Chanku Hwang

Chanku Hwang 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).

  • Voltage to current converter with variation-free MOS resistor
    Patent number: 6388507
    Abstract: A voltage controlled current source circuit of the present invention includes first reference current coupled to a voltage control node. A current input of a voltage controlled impedance is reproduced at the voltage control node through a current mirror as a second reference current. The voltage resulting from the action of the first and second reference currents is coupled to a voltage control input of the voltage controlled impedance. In one embodiment, a control voltage is provided to the gate of a transistor. The source of the transistor is coupled to the current input of a second voltage controlled impedance circuit to produce an output current at the drain of the transistor. The second voltage controlled impedance circuit has a voltage control input coupled to the voltage control input of the first voltage controlled impedance and to the voltage control node.
    Type: Grant
    Filed: January 10, 2001
    Date of Patent: May 14, 2002
    Assignee: Hitachi America, Ltd.
    Inventors: Chanku Hwang, Hassan Osama Elwan