Patents by Inventor Takeko Yumoto

Takeko Yumoto 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).

  • Method and apparatus for calibrating an analog-to-digital conversion apparatus
    Patent number: 4736189
    Abstract: The phase relation of clock signals to be applied to an interleave type analog-to-digital conversion apparatus having N analog-to-digital converters is calibrated by applying a repetitive reference signal to the N analog-to-digital converters. The digital values from the N analog-to-digital converters are selected at corresponding sampling points of successive cycles of the reference signal. The clock phase relation is adjusted such that the selected digital values are made substantially equal to each other.
    Type: Grant
    Filed: October 8, 1986
    Date of Patent: April 5, 1988
    Assignee: Sony/Tektronix Corporation
    Inventors: Hiromi Katsumata, Rikichi Murooka, Takeko Yumoto