Patents by Inventor Steven Douglas Roach

Steven Douglas Roach 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).

  • Precision current source
    Patent number: 7893756
    Abstract: A device for providing a precision current includes a first operational amplifier and multiple path transistors. The first operational amplifier outputs a gate voltage based on reference voltage and input voltages. The path transistors have corresponding gates for receiving the gate voltage from the first operational amplifier. Each path transistor is connected to a first enable transistor configured to selectively connect the path transistor to a reference path and a second enable transistor configured to selectively connect the path transistor to an output path. The first and second enable transistors are separately enabled by first and second enable signals, respectively. At least one path transistor is connected to the reference path through a corresponding first enable transistor to provide the reference current, and least one other path transistor is connected to the output path through a corresponding second enable transistor to provide the precision current based on the reference current.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: February 22, 2011
    Assignee: Agilent Technologies, Inc.
    Inventors: Jill Marie Pamperin, Steven Douglas Roach
  • PRECISION CURRENT SOURCE
    Publication number: 20100123516
    Abstract: A device for providing a precision current includes a first operational amplifier and multiple path transistors. The first operational amplifier outputs a gate voltage based on reference voltage and input voltages. The path transistors have corresponding gates for receiving the gate voltage from the first operational amplifier. Each path transistor is connected to a first enable transistor configured to selectively connect the path transistor to a reference path and a second enable transistor configured to selectively connect the path transistor to an output path. The first and second enable transistors are separately enabled by first and second enable signals, respectively. At least one path transistor is connected to the reference path through a corresponding first enable transistor to provide the reference current, and least one other path transistor is connected to the output path through a corresponding second enable transistor to provide the precision current based on the reference current.
    Type: Application
    Filed: November 14, 2008
    Publication date: May 20, 2010
    Applicant: AGILENT TECHNOLOGIES, INC.
    Inventors: Jill Marie PAMPERIN, Steven Douglas ROACH