Patents by Inventor Joao Nuno Ramalho

Joao Nuno Ramalho 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).

  • Amplifier for alternating signals superimposed on a continuous signal and method for amplifying such signals
    Patent number: 6876253
    Abstract: This amplifier is intended for amplifying variable signals superimposed on a continuous signal. This continuous signal serves in particular for biasing a component, a magnetoresistive resistor used as a hard disk reading head. To avoid the harmful effects of a sudden fluctuation in the continuous signal, this amplifier comprises a set of switchable reactive elements (70) for acting on said transfer function and a bias drift compensation circuit (80) for controlling the switching of said switchable elements with a view to anticipating the effects of said fluctuation.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: April 5, 2005
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Thierry Tellier, Lionel Guiraud, Joao Nuno Ramalho
  • Amplifier for alternating signals superimposed on a continuous signal and method for amplifying such signals
    Publication number: 20040150477
    Abstract: This amplifier is intended for amplifying variable signals superimposed on a continuous signal. This continuous signal serves in particular for biasing a component, a magnetoresistive resistor used as a hard disk reading head. To avoid the harmful effects of a sudden fluctuation in the continuous signal, this amplifier comprises a set of switchable reactive elements (70) for acting on said transfer function and a bias drift compensation circuit (80) for controlling the switching of said switchable elements with a view to anticipating the effects of said fluctuation.
    Type: Application
    Filed: September 25, 2002
    Publication date: August 5, 2004
    Inventors: Thierry Tellier, Lionel Guiraud, Joao Nuno Ramalho