Patents by Inventor Robert L. Gruebel

Robert L. Gruebel 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).

  • ECL/TTL conversion circuit and translation programmable array logic
    Patent number: 5047672
    Abstract: A circuit (90) converts a true ECL signal to a true TTL signal. The circuit includes a differential circuit (180) that receives an ECL signal having high and low values. The differential circuit produces a differential signal therefrom that has a high value in response to one of the high and low values of the true ECL signal, and a low value in response to the other of the high and low values of the true ECL signal. A first translator circuit (36, 64) has an input (32) coupled to the differential circuit (180). The first translator circuit (36, 64) transmits a true low TTL output (56) signal having a voltage level referenced to the voltage level of a TTL low supply voltage in response to receiving a high value of the differential signal. A second translator circuit (46, 52) has an input (38) and is coupled to a TTL high supply voltage and the output (56).
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: September 10, 1991
    Assignee: Texas Instruments Incorporated
    Inventors: Rohit L. Bhuva, Walter C. Bonneau, Jr., Robert L. Gruebel, Robert A. Helmick, Allen Y. Chen