Patents by Inventor Tim-Wah Luk

Tim-Wah Luk 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).

  • TTL tristate device with reduced output capacitance
    Patent number: 4581550
    Abstract: An improved TTL tristate device with reduced output capacitance incorporates an active discharge sequence of three elements including first and second active transistor elements (Q8, Q7) in an inversion coupling and a third passive element comprising a passive diode cluster (D3, D4, D5) coupled between the base of the second transistor element (Q7) and the enable gate. The passive diode cluster is operatively arranged for delivering base drive current to the base of the second transistor (Q7) when the enable gate (A) is at high potential for operation of the output device in the bistate mode. The passive diode cluster also operatively diverts base drive current away from the base of the second transistor (Q7) when the enable gate (A) is at low potential for operation of the output device in the high impedance third state with reduced output capacitance.
    Type: Grant
    Filed: March 6, 1984
    Date of Patent: April 8, 1986
    Assignee: Fairchild Camera & Instrument Corporation
    Inventors: David A. Ferris, Benny Chang, Tim-Wah Luk