Patents by Inventor James John MCCULLAGH

James John MCCULLAGH 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).

  • Full-wave charge pump with low-voltage startup
    Patent number: 10250235
    Abstract: A charge pump with low-voltage startup is presented. The charge pump circuit is comprised of transistor pairs arranged in stages, where the charge pump circuit is configured to receive an input voltage and generate an output voltage whose magnitude is larger than magnitude of the input voltage. An energy storage device is configured to receive and store voltage from the charge pump circuit. A switching circuit is interfaced with the control terminals of the transistors in the charge pump circuit. In response to leakage current through the transistors in the charge pump circuit, the switching circuit switches on select transistors in the charge pump circuit while voltage stored by the energy storage device is below threshold voltage of the transistors in the charge pump circuit.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: April 2, 2019
    Assignee: The Regents of The University of Michigan
    Inventors: Khalil Najafi, Rebecca L. Peterson, James John McCullagh
  • Full-Wave Charge Pump With Low-Voltage Startup
    Publication number: 20170155379
    Abstract: A charge pump with low-voltage startup is presented. The charge pump circuit is comprised of transistor pairs arranged in stages, where the charge pump circuit is configured to receive an input voltage and generate an output voltage whose magnitude is larger than magnitude of the input voltage. An energy storage device is configured to receive and store voltage from the charge pump circuit. A switching circuit is interfaced with the control terminals of the transistors in the charge pump circuit. In response to leakage current through the transistors in the charge pump circuit, the switching circuit switches on select transistors in the charge pump circuit while voltage stored by the energy storage device is below threshold voltage of the transistors in the charge pump circuit.
    Type: Application
    Filed: November 30, 2016
    Publication date: June 1, 2017
    Inventors: Khalil NAJAFI, Rebecca L. PETERSON, James John MCCULLAGH