Patents by Inventor Roberto Allni

Roberto Allni 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).

  • Read head preamplifier with thermal asperity transient control
    Patent number: 7274523
    Abstract: A preamplifier for correcting for thermal asperity transients in disk drives using magneto resistive read heads. The preamplifier has an input gain stage receiving a signal from the read head and an output buffer outputting a reader output to a read channel that is filtered of thermal asperity transients by a high pass filter positioned between the input gain stage and the output buffer. The high pass filter is voltage controlled based on an input control signal from a filter controller. The filter controller uses a low pass filter functioning as a peak detector to detect peaks in either the input or output voltage of the high pass filter. The low pass filter output is applied to a non-linear function generator generating the control signal for the high pass filter based on an increasing function of the absolute value of the low pass filter output.
    Type: Grant
    Filed: March 31, 2004
    Date of Patent: September 25, 2007
    Assignee: STMicroelectronics, Inc.
    Inventors: Kemal Ozanoglu, Baris Posat, Roberto Allni
  • Read head preamplifier with thermal asperity transient control
    Publication number: 20050219725
    Abstract: A preamplifier for correcting for thermal asperity transients in disk drives using magneto resistive read heads. The preamplifier has an input gain stage receiving a signal from the read head and an output buffer outputting a reader output to a read channel that is filtered of thermal asperity transients by a high pass filter positioned between the input gain stage and the output buffer. The high pass filter is voltage controlled based on an input control signal from a filter controller. The filter controller uses a low pass filter functioning as a peak detector to detect peaks in either the input or output voltage of the high pass filter. The low pass filter output is applied to a non-linear function generator generating the control signal for the high pass filter based on an increasing function of the absolute value of the low pass filter output.
    Type: Application
    Filed: March 31, 2004
    Publication date: October 6, 2005
    Inventors: Kemal Ozanoglu, Baris Posat, Roberto Allni