Patents by Inventor Youhei Maruyama

Youhei Maruyama 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).

  • Signal hold circuit
    Patent number: 6542009
    Abstract: A peak hold circuit that can operate to follow changes in peak value even if the changes are abrupt. The peak hold circuit (1) of the present invention has current control circuit (31), auxiliary switch element (25), and auxiliary constant current circuit (26). Current control circuit (31) counts the number of reference clock pulses RCK after output signal Vout becomes higher than analog voltage DI. When the number of clock pulses counted reaches a prescribed number or larger, auxiliary switch element (25) is turned on to operate auxiliary constant current circuit (26) to increase the amount of drop of output signal Vout per unit time. Consequently, even if output signal Vout becomes higher than the peak value of analog voltage DI, it is possible, by increasing the amount of drop of output signal Vout to make output signal Vout lower than analog voltage DI in a shorter amount of time than in the case in the conventional technology.
    Type: Grant
    Filed: March 27, 2002
    Date of Patent: April 1, 2003
    Assignee: Texas Instruments Incorporated
    Inventor: Youhei Maruyama
  • Signal hold circuit
    Publication number: 20020153927
    Abstract: A peak hold circuit that can operate to follow changes in peak value even if the changes are abrupt. The peak hold circuit (1) of the present invention has current control circuit (31), auxiliary switch element (25), and auxiliary constant current circuit (26). Current control circuit (31) counts the number of reference clock pulses RCK after output signal Vout becomes higher than analog voltage DI. When the number of clock pulses counted reaches a prescribed number or larger, auxiliary switch element (25) is turned on to operate auxiliary constant current circuit (26) to increase the amount of drop of output signal Vout per unit time. Consequently, even if output signal Vout becomes higher than the peak value of analog voltage DI, it is possible, by increasing the amount of drop of output signal Vout to make output signal Vout lower than analog voltage DI in a shorter amount of time than in the case in the conventional technology.
    Type: Application
    Filed: March 27, 2002
    Publication date: October 24, 2002
    Inventor: Youhei Maruyama
  • DC offset removing circuit for magneto-optical recording medium
    Patent number: 6128266
    Abstract: The objective of the invention is to provide a type of offset elimination circuit that can reliably remove the ripple error.
    Type: Grant
    Filed: February 23, 1998
    Date of Patent: October 3, 2000
    Assignee: Texas Instruments Incorporated
    Inventor: Youhei Maruyama