Patents by Inventor William J. Mruk

William J. Mruk 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: 4591738
    Abstract: A substrate voltage generator is disclosed which provides over 1.5 times as much current for a given size circuit, as has been capable with prior art substrate voltage generators. This is achieved by means of a high capacitance per unit area charge pumping capacitor having a triple plate structure and further through the space saving technique of providing a dual use for the source diffusion of the current sinking device in the circuit so as to also serve as the guard ring around the charge pumping circuit of the substrate voltage generator. These and other features of the substrate voltage generator circuit enable relatively large quantities of current to be supplied for maintaining the substrate voltage in large dimension VLSI chips having significant diffusion leakage currents.
    Type: Grant
    Filed: October 27, 1983
    Date of Patent: May 27, 1986
    Assignee: International Business Machines Corporation
    Inventors: John S. Bialas, Jr., Richard J. Daniels, William J. Mruk
  • Patent number: 4547682
    Abstract: A precision regulation substrate voltage generator circuit is disclosed which employs frequency modulation to modify the oscillator frequency driving the substrate charge pump, in order to more precisely control the resultant substrate voltage in an integrated circuit.
    Type: Grant
    Filed: October 27, 1983
    Date of Patent: October 15, 1985
    Assignee: International Business Machines Corporation
    Inventors: John S. Bialas, Jr., Richard J. Daniels, William J. Mruk