Patents by Inventor Keith M. A. Selbo

Keith M. A. Selbo 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).

  • Patent number: 4421994
    Abstract: An FET driver circuit is disclosed which provides short circuit protection at the output node without reducing its performance. Grounded short circuit protection is achieved by sharing a load resistance at the output node in two parallel components, a low resistance active FET load and a high resistance active FET load. A delay element is inserted between the data input node and the gate for the low resistance active FET load. When the data input is low, both of the active FET load devices are off and the active logical FET device is on causing a low output value for the circuit. When the data input for the circuit goes high, the output capacitance is initially charged by the high resistance FET load device and is followed after a short delay, by charging through the low resistance FET load device. The low resistance FET load device cuts off current flow automatically after a predetermined period of time transpires.
    Type: Grant
    Filed: November 2, 1981
    Date of Patent: December 20, 1983
    Assignee: IBM Corporation
    Inventors: Yogi K. Puri, Keith M. A. Selbo