Patents by Inventor Hin F. Chau

Hin F. Chau 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).

  • Method of making collector-up bipolar transistor having improved emitter injection efficiency
    Patent number: 5512496
    Abstract: A collector-up bipolar transistor having an undercut region (522) beneath extrinsic regions of a base layer (510) and an emitter layer (508). The extrinsic emitter region is depleted of charge carriers and provides passivation for the extrinsic portion of the base layer (508). Contact to the emitter layer may be made by forming contacts on the top surface of the substrate (500) or in a recess in the backside of the substrate.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: April 30, 1996
    Assignee: Texas Instruments Incorporated
    Inventors: Hin F. Chau, Hua Q. Tserng
  • Depleted extrinsic emitter of collector-up heterojunction bipolar transistor
    Patent number: 5485025
    Abstract: A collector-up bipolar transistor having an undercut region (522) beneath extrinsic regions of a base layer (510) and an emitter layer (508). The extrinsic emitter region is depleted of charge carriers and provides passivation for the extrinsic portion of the base layer (508). Contact to the emitter layer may be made by forming contacts on the top surface of the substrate (500) or in a recess in the backside of the substrate.
    Type: Grant
    Filed: December 2, 1994
    Date of Patent: January 16, 1996
    Assignee: Texas Instruments Incorporated
    Inventors: Hin F. Chau, Hua Q. Tserng