D.c. Coupling Patents (Class 330/159)
  • Patent number: 6559719
    Abstract: An amplifier includes differential input transistors, first switches arranged between each gates and source of the differential input transistors, a second switch arranged to turn on/off a current source that gives the bias of the differential input transistors, and a drive circuit arranged to turn off the second switch and turns on the first switches when the current of the current source is not supplied to the differential input transistors.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: May 6, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takamasa Sakuragi