Patents by Inventor Carl Chai

Carl Chai 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).

  • Class AB amplifier with programmable quiescent current
    Patent number: 9407208
    Abstract: A Class AB amplifier has a control stage and a push-pull stage. The control stage has a programmable resistor that allows a floating constant voltage to applied to the push-pull stage such that the quiescent current of the amplifier is relatively low. The configuration enables the amplifier to operate properly at relatively low power-supply voltage levels. The amplifier can be configured as the output driver for an operational amplifier (op-amp) with a Miller compensation configuration that replaces the conventional Miller compensation resistor with a transistor that is part of the op-amp.
    Type: Grant
    Filed: November 7, 2014
    Date of Patent: August 2, 2016
    Assignee: LATTICE SEMICONDUCTOR CORPORATION
    Inventors: Vinh Ho, Carl Chai, Allan Lin
  • Class AB Amplifier With Programmable Quiescent Current
    Publication number: 20160134238
    Abstract: A Class AB amplifier has a control stage and a push-pull stage. The control stage has a programmable resistor that allows a floating constant voltage to applied to the push-pull stage such that the quiescent current of the amplifier is relatively low. The configuration enables the amplifier to operate properly at relatively low power-supply voltage levels. The amplifier can be configured as the output driver for an operational amplifier (op-amp) with a Miller compensation configuration that replaces the conventional Miller compensation resistor with a transistor that is part of the op-amp.
    Type: Application
    Filed: November 7, 2014
    Publication date: May 12, 2016
    Inventors: Vinh Ho, Carl Chai, Allan Lin