Patents by Inventor Efthimios Davrazos

Efthimios Davrazos 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).

  • Driver for DDR2/3 memory interfaces
    Patent number: 9299401
    Abstract: An apparatus is described that includes a combined drive and termination circuit programmable to interface to DDR2 and DDR3 memory modules. In an exemplary embodiment the apparatus includes a combined output/termination driver, an input driver and a calibration subsystem. The combined output/termination driver includes a number of pull-up circuits and a number of pull-down circuits. One of the pull-up circuits presents a fixed output impedance. The rest of the pull-up circuits have an impedance programmable between two desired impedance values. One of the pull-down circuits presents a fixed output impedance. The rest of the pull-down circuits have an impedance programmable between two desired impedance values. The necessary number of pull-up circuits and pull-down circuits is activated in order to provide a desired driving and termination circuit such as to interface to specific impedance values as defined by the DDR2 and DDR3 interface protocol.
    Type: Grant
    Filed: January 27, 2011
    Date of Patent: March 29, 2016
    Assignee: ANALOGIES SA
    Inventors: Fotis Plessas, Efthimios Davrazos, Michael Birbas, John Kikidis
  • DRIVER FOR DDR2/3 MEMORY INTERFACES
    Publication number: 20130103898
    Abstract: An apparatus is described that includes a combined drive and termination circuit programmable to interface to DDR2 and DDR3 memory modules. In an exemplary embodiment the apparatus includes a combined output/termination driver, an input driver and a calibration subsystem. The combined output/termination driver includes a number of pull-up circuits and a number of pull-down circuits. One of the pull-up circuits presents a fixed output impedance. The rest of the pull-up circuits have an impedance programmable between two desired impedance values. One of the pull-down circuits presents a fixed output impedance. The rest of the pull-down circuits have an impedance programmable between two desired impedance values. The necessary number of pull-up circuits and pull-down circuits is activated in order to provide a desired driving and termination circuit such as to interface to specific impedance values as defined by the DDR2 and DDR3 interface protocol.
    Type: Application
    Filed: January 27, 2011
    Publication date: April 25, 2013
    Applicant: ANALOGIES, S.A.
    Inventors: Fotis Plessas, Efthimios Davrazos, Michael Birbas, John Kikidis