Patents by Inventor Youngoo Yang

Youngoo Yang 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).

  • Patent number: 10153741
    Abstract: An average power tracking mode power amplifier is disclosed herein. The average power tracking mode power amplifier includes a Power Amplifier (PA), a first Direct Current (DC)-DC voltage converter, and a second DC-DC voltage converter. The PA includes a driver stage configured to be driven by first drive voltage and a main amplification stage configured to be driven by second drive voltage. The first DC-DC voltage converter generates the first drive voltage from power voltage so that the first drive voltage is equal to or higher than the power voltage, and applies the generated first drive voltage to the driver stage. The second DC-DC voltage converter generates the second drive voltage from the power voltage so that the second drive voltage is higher than the first drive voltage, and applies the generated second drive voltage to the main amplification stage.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: December 11, 2018
    Assignee: Research & Business Foundation Sungkyunkwan University
    Inventors: Youngoo Yang, Won Seob Lim
  • Publication number: 20180294777
    Abstract: A compact load network for a Doherty power amplifier includes a first inductor, a second inductor, a series capacitor, and a filter unit. The first inductor is configured such that one terminal thereof is connected to a drain voltage terminal and a remaining terminal thereof is connected in parallel to an output terminal of a first transistor. The second inductor is configured such that one terminal thereof is connected to a drain voltage terminal and a remaining terminal thereof is connected in parallel to an output terminal of a second transistor. The series capacitor is connected in series between the output terminal of the first transistor and the output terminal of the second transistor. The filter unit is connected between the output terminal of the second transistor and a signal output terminal.
    Type: Application
    Filed: December 13, 2017
    Publication date: October 11, 2018
    Applicant: RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY
    Inventors: Youngoo YANG, Hwiseob LEE, Wonseob LIM
  • Patent number: 9876440
    Abstract: Disclosed herein is an active rectifier. The rectifier includes a rectifier unit, a driver unit, and a switching device control circuit unit. The rectifier unit includes first and fourth transistors configured to become conductive when the voltage of an alternating current (AC) input is negative and apply the current of the AC input to a rectifier capacitor, and second and third transistors configured to become conductive when the voltage of the AC input is positive and apply the current of the AC input to the rectifier capacitor. The driver unit outputs first to fourth drive control signals, and drives the first to fourth transistors. The switching device control circuit unit compares the first drive control signal and the second drive control signal with the AC input, and outputs switching device control signals to delay the first to fourth drive control signals based on the extents to delay.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: January 23, 2018
    Assignee: Research & Business Foundation Sungkyunkwan University
    Inventors: Kang Yoon Lee, Seong Jin Oh, Youngoo Yang, Keum Cheol Hwang, Young Jun Park, Sang Yun Kim, Byeong Gi Jang, Jung Yeon Kim
  • Patent number: 9735627
    Abstract: An input driver includes a power converting unit and a level adjusting unit. The power converting unit is configured to generate a first power and a second power having an anti-phase relationship based on input power, and process the first power and the second power as differential inputs to output a third power. The level adjusting unit is configured to adjust a voltage level of the third power and output the adjusted power as an input to a power amplifier.
    Type: Grant
    Filed: January 20, 2016
    Date of Patent: August 15, 2017
    Assignees: Samsung Electro-Mechanics Co., Ltd., RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY
    Inventors: Si Hyung Kim, Woo Seok Lee, Youngoo Yang, Hwi Seob Lee, Chul Gyun Park, Sung Uk Lee
  • Patent number: 9667204
    Abstract: A power amplification apparatus includes a multiple output bias voltage generation unit, a dynamic bias modulator, and a power amplifier. The multiple output bias voltage generation unit generates first and second bias voltages using an inductor coupled between an input voltage and a plurality of capacitors. The capacitors are connected to the inductor in a non-overlapping manner. The dynamic bias modulator outputs the first bias voltage or the second bias voltage as a variable bias voltage based on results of comparing voltage of an envelope signal of a radio frequency (RF) signal to an envelope reference voltage. The power amplifier is biased in response to the variable bias voltage, amplifies power of the RF signal, and outputs the amplified RF signal to an antenna.
    Type: Grant
    Filed: May 3, 2016
    Date of Patent: May 30, 2017
    Assignee: Research & Business Foundation Sungkyunkwan University
    Inventors: Youngoo Yang, Jong Seok Bae, Sung Jae Oh, Soo Ho Cho
  • Publication number: 20170040955
    Abstract: A power amplification apparatus includes a multiple output bias voltage generation unit, a dynamic bias modulator, and a power amplifier. The multiple output bias voltage generation unit generates first and second bias voltages using an inductor coupled between an input voltage and a plurality of capacitors. The capacitors are connected to the inductor in a non-overlapping manner. The dynamic bias modulator outputs the first bias voltage or the second bias voltage as a variable bias voltage based on results of comparing voltage of an envelope signal of a radio frequency (RF) signal to an envelope reference voltage. The power amplifier is biased in response to the variable bias voltage, amplifies power of the RF signal, and outputs the amplified RF signal to an antenna.
    Type: Application
    Filed: May 3, 2016
    Publication date: February 9, 2017
    Applicant: RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY
    Inventors: Youngoo YANG, Jong Seok BAE, Sung Jae OH, Soo Ho CHO
  • Patent number: 9559637
    Abstract: An envelope tracking power amplifier is disclosed herein. The envelope tracking power amplifier includes a multi-mode bias modulator and a power amplifier. The multi-mode bias modulator generates an envelope-modulated bias voltage from the envelope signal of an radio frequency (RF) signal whose power is to be amplified by using a linear amplifier and a switching amplifier each having varying current driving capability in response to an operation mode control signal that determines any one of low-level mode and high-level mode. The power amplifier is biased in response to the envelope-modulated bias voltage, amplifies the RF signal, and outputs the amplified RF signal to an antenna.
    Type: Grant
    Filed: February 13, 2015
    Date of Patent: January 31, 2017
    Assignee: RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY
    Inventors: Youngoo Yang, Junghyun Ham
  • Publication number: 20170005629
    Abstract: An average power tracking mode power amplifier is disclosed herein. The average power tracking mode power amplifier includes a Power Amplifier (PA), a first Direct Current (DC)-DC voltage converter, and a second DC-DC voltage converter. The PA includes a driver stage configured to be driven by first drive voltage and a main amplification stage configured to be driven by second drive voltage. The first DC-DC voltage converter generates the first drive voltage from power voltage so that the first drive voltage is equal to or higher than the power voltage, and applies the generated first drive voltage to the driver stage. The second DC-DC voltage converter generates the second drive voltage from the power voltage so that the second drive voltage is higher than the first drive voltage, and applies the generated second drive voltage to the main amplification stage.
    Type: Application
    Filed: June 7, 2016
    Publication date: January 5, 2017
    Applicant: RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY
    Inventors: Youngoo YANG, Won Seob LIM
  • Patent number: 9425744
    Abstract: A multi-mode bias modulator operating in envelope tracking mode or average power tracking mode and an envelope tracking power amplifier using the same are disclosed. The envelope tracking power amplifier includes a multi-mode bias modulator and a power amplifier. The multi-mode bias modulator generates a variable bias voltage using a linear amplifier and a switching amplifier operating in envelope tracking mode or average power tracking mode in accordance with an operation mode control signal that determines any one of envelope tracking mode and average power tracking mode. The power amplifier is biased in response to the variable bias voltage, power-amplifies a radio frequency (RF) signal, and outputs the amplified RF signal to an antenna.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: August 23, 2016
    Assignee: Research & Business Foundation Sungkyunkwan University
    Inventors: Youngoo Yang, Junghyun Ham, Hearyun Jung
  • Publication number: 20160241198
    Abstract: An input driver includes a power converting unit and a level adjusting unit. The power converting unit is configured to generate a first power and a second power having an anti-phase relationship based on input power, and process the first power and the second power as differential inputs to output a third power. The level adjusting unit is configured to adjust a voltage level of the third power and output the adjusted power as an input to a power amplifier.
    Type: Application
    Filed: January 20, 2016
    Publication date: August 18, 2016
    Applicants: Samsung Electro-Mechanics Co., Ltd., RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY
    Inventors: Si Hyung KIM, Woo Seok LEE, Youngoo YANG, Hwi Seob LEE, Chul Gyun PARK, Sung Uk LEE
  • Patent number: 9130515
    Abstract: An apparatus and a method for balanced power amplification are provided. An amplifier includes a splitter configured to split an input signal into a first input signal and a second input signal that include a 90° phase difference. The amplifier further includes a first power amplifier (PA) configured to amplify the first input signal to generate a first output signal. The amplifier further includes a second PA configured to amplify the second input signal to generate a second output signal. The amplifier further includes a combiner configured to combine the first output signal and the second output signal that include the 90° phase difference to generate an output signal.
    Type: Grant
    Filed: April 16, 2013
    Date of Patent: September 8, 2015
    Assignees: Samsung Electronics Co., Ltd., SUNGKYUNKWAN UNIVERSITY Foundation for Corporate Collaboration
    Inventors: Jin Sung Choi, Sang Wook Kwon, Ki Young Kim, Nam Yun Kim, Dong Zo Kim, Yun Kwon Park, Eun Seok Park, Keum Su Song, Young Ho Ryu, Chang Wook Yoon, Youngoo Yang
  • Publication number: 20150236652
    Abstract: A multi-mode bias modulator operating in envelope tracking mode or average power tracking mode and an envelope tracking power amplifier using the same are disclosed. The envelope tracking power amplifier includes a multi-mode bias modulator and a power amplifier. The multi-mode bias modulator generates a variable bias voltage using a linear amplifier and a switching amplifier operating in envelope tracking mode or average power tracking mode in accordance with an operation mode control signal that determines any one of envelope tracking mode and average power tracking mode. The power amplifier is biased in response to the variable bias voltage, power-amplifies a radio frequency (RF) signal, and outputs the amplified RF signal to an antenna.
    Type: Application
    Filed: February 19, 2015
    Publication date: August 20, 2015
    Applicant: Research & Business Foundation SUNGKYUNKWAN UNIVERSITY
    Inventors: Youngoo YANG, Junghyun HAM, Hearyun JUNG
  • Publication number: 20150236651
    Abstract: An envelope tracking power amplifier is disclosed herein. The envelope tracking power amplifier includes a multi-mode bias modulator and a power amplifier. The multi-mode bias modulator generates an envelope-modulated bias voltage from the envelope signal of an radio frequency (RF) signal whose power is to be amplified by using a linear amplifier and a switching amplifier each having varying current driving capability in response to an operation mode control signal that determines any one of low-level mode and high-level mode. The power amplifier is biased in response to the envelope-modulated bias voltage, amplifies the RF signal, and outputs the amplified RF signal to an antenna.
    Type: Application
    Filed: February 13, 2015
    Publication date: August 20, 2015
    Applicant: RESEARCH & BUSINESS FOUNDATION SUNGKYUNKWAN UNIVERSITY
    Inventors: Youngoo YANG, Junghyun HAM
  • Patent number: 8955757
    Abstract: An apparatus for collecting wireless is provided. The apparatus includes an antenna and a collection circuit. The antenna generates an alternating current (AC) voltage from a radio wave. The collection circuit generates a direct current (DC) voltage corresponding to the AC voltage, determines whether the DC voltage is lower than a preset value, and changes an internal impedance of the collection circuit if it is determined that the DC voltage is lower than the preset voltage.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: February 17, 2015
    Assignee: Intellectual Discovery Co., Ltd.
    Inventors: Sung-chan Jung, Min-geun Song, Hyung-chul Kim, Youngoo Yang
  • Publication number: 20130271222
    Abstract: An apparatus and a method for balanced power amplification are provided. An amplifier includes a splitter configured to split an input signal into a first input signal and a second input signal that include a 90° phase difference. The amplifier further includes a first power amplifier (PA) configured to amplify the first input signal to generate a first output signal. The amplifier further includes a second PA configured to amplify the second input signal to generate a second output signal. The amplifier further includes a combiner configured to combine the first output signal and the second output signal that include the 90° phase difference to generate an output signal.
    Type: Application
    Filed: April 16, 2013
    Publication date: October 17, 2013
    Applicants: SUNGKYUNKWAN UNIVERSITY Foundation for corporate Collaboration, SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Jin Sung CHOI, Sang Wook KWON, Ki Young KIM, Nam Yun KIM, Dong Zo KIM, Yun Kwon PARK, Eun Seok PARK, Keum Su SONG, Young Ho RYU, Chang Wook YOON, Youngoo YANG
  • Patent number: 8463201
    Abstract: An apparatus and method for removing a transmission leakage signal from a radio frequency identification (RFID) reader are provided. The apparatus includes a removing unit having a device of a large impedance and a phase shifter capable of a wide range phase change with respect to a leakage signal, thereby optimally removing the transmission leakage signal irrespective of a change in the frequency characteristics and a change in the length of a cable.
    Type: Grant
    Filed: June 2, 2011
    Date of Patent: June 11, 2013
    Assignees: Samsung Techwin Co., Ltd., Sungkyunkwan University Foundation for Corporate
    Inventors: Sung-chan Jung, Youngoo Yang, Min-su Kim
  • Publication number: 20120163049
    Abstract: An apparatus for collecting wireless is provided. The apparatus includes an antenna and a collection circuit. The antenna generates an alternating current (AC) voltage from a radio wave. The collection circuit generates a direct current (DC) voltage corresponding to the AC voltage, determines whether the DC voltage is lower than a preset value, and changes an internal impedance of the collection circuit if it is determined that the DC voltage is lower than the preset voltage.
    Type: Application
    Filed: December 22, 2011
    Publication date: June 28, 2012
    Applicants: SUNGKYUNKWAN UNIVERSITY FOUNDATION FOR CORPORATE COLLABORATION, Samsung Techwin Co., Ltd.
    Inventors: Sung-chan JUNG, Min-geun SONG, Hyung-chul KIM, Youngoo YANG
  • Publication number: 20120139796
    Abstract: A multi-layer multi band antenna is provided. Because the antenna carrier has a structure stacked in a plurality of layers having different dielectric constants, the antenna maintains a small size yet has an improved radiation performance in a desired bandwidth.
    Type: Application
    Filed: December 6, 2011
    Publication date: June 7, 2012
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Chul Woo PARK, Yong Sup Kim, Youngoo Yang
  • Publication number: 20110300817
    Abstract: An apparatus and method for removing a transmission leakage signal from a radio frequency identification (RFID) reader are provided. The apparatus includes a removing unit having a device of a large impedance and a phase shifter capable of a wide range phase change with respect to a leakage signal, thereby optimally removing the transmission leakage signal irrespective of a change in the frequency characteristics and a change in the length of a cable.
    Type: Application
    Filed: June 2, 2011
    Publication date: December 8, 2011
    Applicants: SUNGKYUNKWAN UNIVERSITY FOUNDATION FOR CORPORATE COLLABORATION, SAMSUNG TECHWIN CO., LTD.
    Inventors: Sung-chan JUNG, Youngoo YANG, Min-su KIM
  • Publication number: 20110273274
    Abstract: A transceiver is provided. The transceiver includes a transmission portion which generates a transmission signal; an antenna which transmits the transmission signal and receives a reception signal; a signal division element which receives the transmission signal from the transmission portion and inputs the received transmission signal to the antenna for transmission, and receives the reception signal received by the antenna; an extraction signal adjusting portion which extracts the transmission signal from the signal division element, and adjusts a phase of the extracted signal to generate an output signal; and a receiving portion which receives the reception signal from the signal division element, and applies the output signal from the extraction signal adjusting portion to the reception signal.
    Type: Application
    Filed: May 6, 2011
    Publication date: November 10, 2011
    Applicants: SUNGKYUNKWAN UNIVERSITY FOUNDATION FOR CORPORATE COLLABORATION, SAMSUNG TECHWIN CO., LTD.
    Inventors: Sung-chan JUNG, Su-kyum KIM, Youngoo YANG