Patents by Inventor Jae-Sub Lee

Jae-Sub Lee 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).

  • Power amplification apparatus for envelope modulation of high frequency signal and method for controlling the same
    Patent number: 8233860
    Abstract: A power amplification apparatus and method provide for controlling envelope modulation of a Radio Frequency (RF) signal. The power amplification apparatus includes a linear amplifier configured to receive an input signal to be amplified, and generate a linear output signal for compensating for a current ripple of an amplified signal and a switch control signal having a current obtained by dividing the linear output signal by a predetermined ratio. The power amplification apparatus also includes a switching amplifier configured to receive the switch control signal through a multi-mode resistor having a variable resistance, and generate the amplified signal. The variable resistance of the multi-mode resistor determines a switching frequency representing an operating speed of the switching amplifier, and is adjusted according to a communication mode of the input signal.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: July 31, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jae-Sub Lee
  • Power amplification apparatus for envelope modulation of high frequency signal and method for controlling the same
    Publication number: 20110109387
    Abstract: A power amplification apparatus and method provide for controlling envelope modulation of a Radio Frequency (RF) signal. The power amplification apparatus includes a linear amplifier configured to receive an input signal to be amplified, and generate a linear output signal for compensating for a current ripple of an amplified signal and a switch control signal having a current obtained by dividing the linear output signal by a predetermined ratio. The power amplification apparatus also includes a switching amplifier configured to receive the switch control signal through a multi-mode resistor having a variable resistance, and generate the amplified signal. The variable resistance of the multi-mode resistor determines a switching frequency representing an operating speed of the switching amplifier, and is adjusted according to a communication mode of the input signal.
    Type: Application
    Filed: November 10, 2010
    Publication date: May 12, 2011
    Applicant: Samsung Electronics Co., Ltd.
    Inventor: Jae-Sub Lee