Patents by Inventor Eric William MacDonald

Eric William MacDonald 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: 6886106
    Abstract: A method and apparatus for providing a dynamically alterable output clock from an input clock based on the value of an integer, where the integer can be modified continuously. The invention also provides a sample cycle output which is an enable pulse, having the width of the input clock cycle, that is asserted one or two input clock cycles prior to the rising edge alignment of the input and output clocks, that acts as a rising edge alignment enable signal, maintaining a one-to-one correspondence between the sample cycle assertions and rising edge alignment events, regardless of the dynamic changes in the value of the integer.
    Type: Grant
    Filed: October 16, 2001
    Date of Patent: April 26, 2005
    Assignee: International Business Machines Corporation
    Inventors: Bishop Chapman Brock, Gary Dale Carpenter, Amanda Christine Caswell, Eric William MacDonald, Timothy Joe Rubidoux
  • Publication number: 20030074595
    Abstract: A method and apparatus for providing a dynamically alterable output clock from an input clock based on the value of an integer, where the integer can be modified continuously. The invention also provides a sample cycle output which is an enable pulse, having the width of the input clock cycle, that is asserted one or two input clock cycles prior to the rising edge alignment of the input and output clocks, that acts as a rising edge alignment enable signal, maintaining a one-to-one correspondence between the sample cycle assertions and rising edge alignment events, regardless of the dynamic changes in the value of the integer.
    Type: Application
    Filed: October 16, 2001
    Publication date: April 17, 2003
    Applicant: International Business Machines Corporation
    Inventors: Bishop Chapman Brock, Gary Dale Carpenter, Amanda Christine Caswell, Eric William MacDonald, Timothy Joe Rubidoux
  • Publication number: 20020075043
    Abstract: A circuit for use in generating a reference voltage. The circuit includes a first transistor having a first source, a first drain, a first gate, and a first body contact. The first body contact is connected to the first gate, and the first drain is connected to an upper voltage source. A second transistor having a second source, a second drain, a second gate, and a second body contact. The second body contact is connected to the second gate, and the second drain is connected to a lower voltage. The circuit also includes a first input connected to the first gate, and a second input connected to the second gate. An output connected to the first source and the second source.
    Type: Application
    Filed: December 14, 2000
    Publication date: June 20, 2002
    Applicant: IBM Corporation
    Inventors: Eric William MacDonald, Lynn Albert Warriner
  • Patent number: 6133799
    Abstract: A voltage controlled ring oscillator (VCRO) that can operate at low voltage and provide a variable periodic output. A plurality of transistors form a ring oscillator and a selected transistor in the ring oscillator has a body which can float with respect to ground potential. The selected transistor has a threshold voltage which is controllable by a voltage applied to the transistor body. A control input is coupled to the transistor body such that the body of the transistor can be charged by the control input. Charging the body alters the threshold voltage of the transistor and thereby controls the oscillation frequency of the oscillator.
    Type: Grant
    Filed: February 25, 1999
    Date of Patent: October 17, 2000
    Assignee: International Business Machines Corporation
    Inventors: Wesley Favors, Jr., Eric William MacDonald, Subir Mukherjee, Lynn Albert Warriner