Patents by Inventor John Christopher Tucker

John Christopher Tucker 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: 7170338
    Abstract: An amplifier including a current source transistor for supplying a current to a node from a voltage rail and an input transistor switching the current at the node in response to an input signal chopped by a chopping signal. A cascode-chopping transistor operating both as a cascode transistor and a chopping transistor couples the node and an amplifier output in response to a bias voltage chopped by the chopping signal.
    Type: Grant
    Filed: March 24, 2005
    Date of Patent: January 30, 2007
    Assignee: Cirrus Logic, Inc.
    Inventor: John Christopher Tucker
  • Patent number: 6400297
    Abstract: A method and system are disclosed for operating two or more integrator amplifiers with different power supplies for a modulator of an analog-to-digital (“A/D”) converter. A first, upstream integrator is operated with one power supply, and the other downstream integrator(s) is/are operated with at least another power supply. The modulator has amplifiers with coefficient gains having values that are determined and set so that voltage levels for the at least another integrator are maintained within operating and output limits. An integrating coefficient gain k1 for the first integrator is set to have a sufficiently large value so that an integrating capacitor can be made small for the one integrator. Another integrating coefficient gain k2 for a second integrator is set to have a sufficiently small value so that an output voltage from the first integrator is sufficiently attenuated to a voltage value within an operating range of the second integrator.
    Type: Grant
    Filed: April 26, 2001
    Date of Patent: June 4, 2002
    Assignee: Cirrus Logic, Inc.
    Inventor: John Christopher Tucker
  • Patent number: 6369733
    Abstract: A method and system of operating dynamic element matching (“DEM”) components of a DEM system with two or more power supplies are disclosed. A connection system of the DEM system is driven with one power supply operating at one voltage. Connection system couples to components that are to be matched and equalized in usage by ordering outputs to components and activating the components according to ordered outputs. A connection calculator of the DEM system is driven with another power supply operating at another voltage different from the one voltage. Connection calculator is coupled to the connection system, and connection calculator calculates an order of usage of components. A level shifter system level shifts voltage levels of signals from connection system to connection calculator, and another level shifter system level shifts voltage levels of signals from connection calculator to connection system.
    Type: Grant
    Filed: April 26, 2001
    Date of Patent: April 9, 2002
    Assignee: Cirrus Logic, Inc.
    Inventors: John Christopher Tucker, Amiya Anand Chokhawala, Yuqing Yang, John Laurence Melanson