Patents by Inventor Russ Apfel

Russ Apfel 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: 5136183
    Abstract: There is disclosed a three-state buffer including a comparator circuit which comprises a plurality of bipolar transistors and which generates first and second control voltages which are dependent upon the forward biased base to emitter voltage drops of the transistors. The comparator circuit also includes a threshold circuit establishing a threshold voltage intermediate the first and second control voltages which is also dependent upon the forward biased base to emitter voltage drops of the transistors. As a result, the threshold voltage is always intermediate the first and second control voltages to assure reliable operation of the comparator circuit notwithstanding variations in integrated circuit processing parameters or integrated circuit operating temperatures.
    Type: Grant
    Filed: June 27, 1990
    Date of Patent: August 4, 1992
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Miki Moyal, Russ Apfel