Patents by Inventor Debra E. Poppas

Debra E. Poppas 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).

  • Temperature compensated voltage reference circuit
    Patent number: 4990846
    Abstract: A reference voltage developing circuit that develops a multiple slope reference voltage that is a function of temperature. The circuit has a plurality of base-emitter multipliers each of which includes a transistor and each of which develops an output voltage that is a function of the base-emitter voltage of the transistor of the multiplier. Since the base-emitter voltage varies with changes in temperature, each multiplier circuit develops a voltage that varies with changes in temperature. The multiplier circuits have different multiplier magnitudes to thereby provide temperature dependent output voltages that have different slopes. A voltage selector circuit is connected to the multiplier circuits and it provides an output voltage that corresponds to the higher of the output voltages developed by the multiplier circuits.
    Type: Grant
    Filed: March 26, 1990
    Date of Patent: February 5, 1991
    Assignee: Delco Electronics Corporation
    Inventors: Paul E. Buck, Robert J. Campbell, Debra E. Poppas, John R. Shreve, Richard J. Voss