Patents by Inventor Ignacio Herrera Alzu

Ignacio Herrera Alzu 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).

  • Integrated oscillator circuit with a memory based frequency control circuit and associated methods
    Patent number: 6271733
    Abstract: An integrated circuit includes an oscillator circuit for generating an output signal having a desired frequency. The oscillator circuit includes a capacitive device having a controllable capacitance value responsive to a control signal. A control circuit is connected to the oscillator circuit for controlling the capacitance value so that the oscillator circuit generates the output signal at the desired frequency. The control circuit includes a memory for storing a digital control word and a control signal generating circuit for converting the digital control word into the control signal for the capacitive device. Setting the desired frequency of the output signal is performed internal to the integrated circuit without requiring complex control circuitry for switching among various capacitors.
    Type: Grant
    Filed: December 13, 1999
    Date of Patent: August 7, 2001
    Assignee: Agere Systems Guardian Corp.
    Inventors: Ignacio Herrera Alzu, Rogelio Peon, Maarten Visee, Robert William Walden