Patents by Inventor Ryu Hasunuma

Ryu Hasunuma 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).

  • IMPEDANCE CALIBRATION CIRCUIT
    Publication number: 20040090239
    Abstract: An impedance calibration circuit for a serial ATA (SATA) transmitter has a resistor in series with each leg of the differential output of the transmitter. An array of selectable resistors is in parallel with each of the series resistors. Resistors in the array are selected to be in parallel with the series resistors. A calibration circuit utilizes a comparator to determine when the minimum error in the impedance calibration is reached. Offset errors in the comparator are compensated for by a circuit which determines the center of alternate ones and zeros generated by the comparator when the input signals are within the offset of the comparator, which should be the point of minimum error in the calibration.
    Type: Application
    Filed: November 12, 2002
    Publication date: May 13, 2004
    Inventors: Takayuki Ikeoku, Ryu Hasunuma, Kenji Namba
  • Impedance calibration circuit
    Patent number: 6734702
    Abstract: An impedance calibration circuit for a serial ATA (SATA) transmitter has a resistor in series with each leg of the differential output of the transmitter. An array of selectable resistors is in parallel with each of the series resistors. Resistors in the array are selected to be in parallel with the series resistors. A calibration circuit utilizes a comparator to determine when the minimum error in the impedance calibration is reached. Offset errors in the comparator are compensated for by a circuit which determines the center of alternate ones and zeros generated by the comparator when the input signals are within the offset of the comparator, which should be the point of minimum error in the calibration.
    Type: Grant
    Filed: November 12, 2002
    Date of Patent: May 11, 2004
    Assignee: Texas Instruments Incorporated
    Inventors: Takayuki Ikeoku, Ryu Hasunuma, Kenji Namba