Patents by Inventor Kwang-Chun Lee

Kwang-Chun 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).

  • Patent number: 11205998
    Abstract: An amplifier may comprise first and second matching networks; first and second transistors; and a transformer including first to third inductors. Also, a gate and a source of the first transistor are connected to the first matching network, one end of the first inductor is connected to a drain of the first transistor, the other end of the first inductor is connected to a source of the second transistor, one end of the second inductor is connected to a gate of the second transistor, the other end of the second inductor is grounded, one end of the third inductor is connected to a drain of the second transistor, and the other end of the third inductor is connected to the second matching network.
    Type: Grant
    Filed: February 11, 2020
    Date of Patent: December 21, 2021
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Sun Woo Kong, Kwang Seon Kim, Jee Hoon Park, Kwang Chun Lee, Hui Dong Lee, Seung Hyun Jang
  • Publication number: 20210036613
    Abstract: A boost direct current-to-direct current (DC-DC) converter using a delta-sigma modulator (DSM), the boost DC-DC converter may comprise a boost driving circuit outputting an output voltage to output terminals by boosting an input voltage, a resistance distribution circuit outputting a feedback voltage by distributing the output voltage of the boost driving circuit, a compensator outputting a compensated feedback voltage by compensating for the feedback voltage outputted by the resistance distribution circuit based on a reference voltage, a delta-sigma modulator outputting a digital signal by modulating the compensated feedback voltage and a duty controller outputting a duty control signal for controlling a switching duty of the boost driving circuit by receiving the output of the delta-sigma modulator.
    Type: Application
    Filed: July 27, 2020
    Publication date: February 4, 2021
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Young Kyun CHO, Tae Joong KIM, Kwang Chun LEE, Jung Nam LEE, Jae Ho JUNG
  • Publication number: 20200266775
    Abstract: An amplifier may comprise first and second matching networks; first and second transistors; and a transformer including first to third inductors. Also, a gate and a source of the first transistor are connected to the first matching network, one end of the first inductor is connected to a drain of the first transistor, the other end of the first inductor is connected to a source of the second transistor, one end of the second inductor is connected to a gate of the second transistor, the other end of the second inductor is grounded, one end of the third inductor is connected to a drain of the second transistor, and the other end of the third inductor is connected to the second matching network.
    Type: Application
    Filed: February 11, 2020
    Publication date: August 20, 2020
    Inventors: Sun Woo KONG, Kwang Seon KIM, Jee Hoon PARK, Kwang Chun LEE, Hui Dong LEE, Seung Hyun JANG
  • Patent number: 9806406
    Abstract: Provided is a plasma antenna. The plasma antenna includes a radiation portion formed by stacking a plurality of radiation disks generating plasma based on provided energy and radiating a signal using the generated plasma, an energy generation portion configured to provide the energy to at least one of the plurality of radiation disks, and a signal transmission portion configured to provide the signal to the at least one radiation disk provided with the energy. Therefore, it is possible to support multiple frequency bands.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: October 31, 2017
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Kwang Chun Lee, Cheol Ho Kim, Gweon Do Jo
  • Patent number: 9577337
    Abstract: Disclosed is a dual polarization-based small antenna for a mobile communication base station. The dual-polarized antenna includes a substrate, a first feed attached to one surface of the substrate, a second feed spaced apart from the first feed and attached to the one surface of the substrate, a radiator located above the first feed and the second feed, and a spiral resonator located between the first feed and the second feed. The dual-polarized antenna effectively provides a broad bandwidth and a high isolation characteristic while having a reduced size, and the spiral resonator allows the isolation characteristic at a certain narrow band range to be effectively enhanced by adjusting of the position, size, and shape of the spiral resonator without affecting the operating frequency of the dual-polarized antenna.
    Type: Grant
    Filed: November 11, 2014
    Date of Patent: February 21, 2017
    Inventors: Jae Ho Jung, Jung Nam Lee, Kwang Chun Lee
  • Patent number: 9231639
    Abstract: There is provided a high frequency transceiver appropriate for ultra low power and high frequency characteristics. The high frequency transmitting device includes a voltage controlled oscillator configured to provide an oscillation signal; and a power amplifier configured to multiply the oscillation signal by an integer to generate a carrier signal, mix the carrier signal and a baseband signal to generate a mixed signal, and amplify power of the mixed signal.
    Type: Grant
    Filed: February 11, 2015
    Date of Patent: January 5, 2016
    Assignee: Electronics & Telecommunications Research Insitute
    Inventors: Bong Hyuk Park, Moon Sik Lee, Kwang Chun Lee
  • Patent number: 9210005
    Abstract: Disclosed is a technique for a transmission apparatus. A method of generating a differential signal includes adding a predetermined offset to an envelope signal to generate a first signal having the same magnitude as the envelope signal with respect to 0, scaling the first signal at a predetermined rate to generate a second signal, changing a sign of the second signal to generate a third signal that is an inverted signal of the second signal, and forming a differential signal using the second signal and the third signal.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: December 8, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Young Kyun Cho, Sung Jun Lee, Seung Hyun Jang, Bong Hyuk Park, Jae Ho Jung, Kwang Chun Lee
  • Publication number: 20150228807
    Abstract: Disclosed is a vertical positive-intrinsic-negative (PIN) diode. The vertical PIN diode includes an intrinsic layer, an N-type layer located on a first surface of the intrinsic layer, a P-type layer located on a second surface of the intrinsic layer, wherein the second surface is opposite to the first surface, a connection layer formed to extend to the first surface from the P-type layer, a first electrode located on the N-type layer, and a second electrode located in the connection area formed on the first surface. Thus, plasma can be easily generated.
    Type: Application
    Filed: February 11, 2015
    Publication date: August 13, 2015
    Applicant: Electronics & Telecommunications Research Institute
    Inventors: Cheol Ho KIM, Kwang Chun LEE
  • Publication number: 20150229495
    Abstract: Disclosed is a technique for a transmission apparatus. A method of generating a differential signal includes adding a predetermined offset to an envelope signal to generate a first signal having the same magnitude as the envelope signal with respect to 0, scaling the first signal at a predetermined rate to generate a second signal, changing a sign of the second signal to generate a third signal that is an inverted signal of the second signal, and forming a differential signal using the second signal and the third signal.
    Type: Application
    Filed: February 6, 2015
    Publication date: August 13, 2015
    Applicant: Electronics & Telecommunications Research Institute
    Inventors: Young Kyun CHO, Sung Jun LEE, Seung Hyun JANG, Bong Hyuk PARK, Jae Ho JUNG, Kwang Chun LEE
  • Publication number: 20150229344
    Abstract: There is provided a high frequency transceiver appropriate for ultra low power and high frequency characteristics. The high frequency transmitting device includes a voltage controlled oscillator configured to provide an oscillation signal; and a power amplifier configured to multiply the oscillation signal by an integer to generate a carrier signal, mix the carrier signal and a baseband signal to generate a mixed signal, and amplify power of the mixed signal.
    Type: Application
    Filed: February 11, 2015
    Publication date: August 13, 2015
    Applicant: Electronics & Telecommunications Research Institute
    Inventors: Bong Hyuk PARK, Moon Sik LEE, Kwang Chun LEE
  • Publication number: 20150214621
    Abstract: Disclosed is a multi-band plasma loop antenna that may reduce radio interference and provide multiple bands. First, the multi-band plasma loop antenna includes an antenna element including a plurality of plasma loop patterns; a plasma activation controller configured to activate a specific plasma loop pattern among the plurality of plasma loop patterns based on an input signal; and at least one RF feed configured to apply an RF signal to the antenna element. Accordingly, a selective multi-frequency band antenna may be easily implemented, and interference between loops may be minimized. In addition, antenna radiation efficiency may be increased by taking a stacked structure.
    Type: Application
    Filed: January 23, 2015
    Publication date: July 30, 2015
    Applicant: Electronics & Telecommunications Research Institute
    Inventors: Cheol Ho KIM, Kwang Chun LEE
  • Publication number: 20150214610
    Abstract: Disclosed is a solid-state plasma antenna that has an adjustable azimuth angle and declination angle and is applied even to a solid-state plasma antenna, which includes an electrode interconnection layer having a curve shape and an electronic path formed therein; a solid-state plasma cell array positioned at an inner side of the curve shape; a plasma activation controller electrically connected with the solid-state plasma cell array through the electrode interconnection layer and configured to activate at least one solid-state plasma cell in the solid plasma cell array based on an input signal; and an RF feed installed a predetermined distance from the inner side of the curve shape and configured to emit an RF signal to the solid-state plasma cell array.
    Type: Application
    Filed: January 23, 2015
    Publication date: July 30, 2015
    Applicant: ELECTRONICS & TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Cheol Ho KIM, Gweon Do JO, Kwang Chun LEE
  • Publication number: 20150214608
    Abstract: Provided is a plasma antenna. The plasma antenna includes a radiation portion formed by stacking a plurality of radiation disks generating plasma based on provided energy and radiating a signal using the generated plasma, an energy generation portion configured to provide the energy to at least one of the plurality of radiation disks, and a signal transmission portion configured to provide the signal to the at least one radiation disk provided with the energy. Therefore, it is possible to support multiple frequency bands.
    Type: Application
    Filed: January 23, 2015
    Publication date: July 30, 2015
    Applicant: Electronics & Telecommunications Research Institute
    Inventors: Kwang Chun LEE, Cheol Ho KIM, Gweon Do JO
  • Patent number: 9083360
    Abstract: A lock detector and a clock generator including the same are disclosed. A lock detector includes a counter unit which counts a non-matching section of a first signal and a second signal to provide a count value, the first signal and the second signal being comparison result signals obtained by comparing a phase of a reference signal with a phase of a comparison signal, and a lock detection unit which outputs a lock detection signal based on a result of comparing the count value with the reference value. Accordingly, a lock state of the phase-locked loop can be detected rapidly and exactly.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: July 14, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hui Dong Lee, Kwang Chun Lee, Jae Ho Jung
  • Publication number: 20150130682
    Abstract: Disclosed is a dual polarization-based small antenna for a mobile communication base station. The dual-polarized antenna includes a substrate, a first feed attached to one surface of the substrate, a second feed spaced apart from the first feed and attached to the one surface of the substrate, a radiator located above the first feed and the second feed, and a spiral resonator located between the first feed and the second feed. The dual-polarized antenna effectively provides a broad bandwidth and a high isolation characteristic while having a reduced size, and the spiral resonator allows the isolation characteristic at a certain narrow band range to be effectively enhanced by adjusting of the position, size, and shape of the spiral resonator without affecting the operating frequency of the dual-polarized antenna.
    Type: Application
    Filed: November 11, 2014
    Publication date: May 14, 2015
    Inventors: Jae Ho JUNG, Jung Nam LEE, Kwang Chun LEE
  • Patent number: 9014281
    Abstract: A delta-sigma modulator and a transmitter apparatus including the same are disclosed. The delta-sigma modulator includes a first integrator, a second integrator, a first comparator configured to compare an output signal of the second integrator and a reference signal, and output a first comparison signal, a second comparator configured to compare the output signal of the second integrator and the reference signal, and output a second comparison signal, a first DAC configured to output the first signal corresponding to the first comparison signal and the second comparison signal, a second DAC configured to output the second signal corresponding to the first comparison signal and the second comparison signal, a delayer configured to generate a delayed signal that delays the first comparison signal and the second comparison signal by a predetermined time, and an output DAC configured to generate an output signal having a multi-level corresponding to the delayed signal.
    Type: Grant
    Filed: August 27, 2013
    Date of Patent: April 21, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Young Kyun Cho, Sung Jun Lee, Seung Hyun Jang, Bong Hyuk Park, Jae Ho Jung, Kwang Chun Lee
  • Patent number: 8841951
    Abstract: Disclosed is an apparatus for controlling a duty ratio of a signal that includes a clock control unit configured to generate a plurality of control signals based on an input signal, a half-cycle generation unit configured to generate a multiplied signal by use of the input signal and a delay signal that is obtained by delaying the input signal based on a delay control voltage, and divide the multiplied signal to generate a first division signal and a second division signal that are in inverse relation to each other, a comparator unit configured to compare a pulse width of the first division signal with a pulse width of the second division signal based on the control signal provided by the clock control unit, and output a delay control signal corresponding to a result of the comparison, and a control voltage generation unit configured to output a delay control voltage.
    Type: Grant
    Filed: October 30, 2013
    Date of Patent: September 23, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hui Dong Lee, Jae Ho Jung, Kwang Chun Lee
  • Patent number: 8791685
    Abstract: Disclosed is a bandgap reference voltage generator insensitive to changes of process, voltage, and temperature. A bandgap reference voltage generator may detect current having characteristic of CTAT and current having characteristic of PTAT which flow in a current compensation part included in an amplification part, and provide body voltage to one of two input transistors included in the amplification part in response to ratio of the two currents when the ratio is different from the preconfigured reference value. Thus, characteristics according to changes of parameters of elements and change of offset of the amplification part due to changes of PVT may be enhanced, and a characteristic of power supply rejection ratio (PSRR) may be enhanced.
    Type: Grant
    Filed: December 6, 2013
    Date of Patent: July 29, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Young Kyun Cho, Jae Ho Jung, Kwang Chun Lee
  • Patent number: 8792395
    Abstract: The present invention relates to a wireless transceiver system for supporting a dual mode that simultaneously supports the Frequency Division Duplex (FDD) method and the Time Division Duplex (TDD) method in a certain frequency band. The present system supports the FDD system conducting transmission and reception simultaneously by using different frequency bands for transmission and reception as well as the TDD system temporally alternating transmission and reception by using the common frequency band among an upper frequency band and a lower frequency band used in the FDD system as well as another frequency band adjacent thereto, thereby selectively supporting both of the two communication systems in a wireless transceiver system.
    Type: Grant
    Filed: May 3, 2007
    Date of Patent: July 29, 2014
    Assignees: Electronics and Telecommunications Research Institute, Samsung Electronics Co., Ltd.
    Inventors: Heon-Kook Kwon, Joon-Hyung Kim, Seong-Min Kim, Yun-Soo Ko, Jae-Ho Jung, Kwang-Chun Lee
  • Patent number: 8767853
    Abstract: Disclosed are a signal distortion component adjusting apparatus and method capable of adjusting error vector magnitude of subcarriers of a predetermined position by adjusting a signal distortion component occurring while decreasing a peak to average power ratio (PAPR) in a communication system of an orthogonal frequency division multiplexing (OFDM) technology or an orthogonal frequency division multiple access (OFDMA) scheme, and a system using the same. The present invention includes a signal distortion component adjusting unit to add an additional signal distortion component Pe((n+N/2) % N) to a signal distortion component e(n) that is obtained by subtracting a threshold Th value, set to decrease peak power, from an absolute value of a time domain signal x(n) of an input signal, and to thereby adjust the signal distortion component. The present invention may transmit a highly reliable signal by adjusting error vector magnitude of subcarrier of a frequency domain.
    Type: Grant
    Filed: August 16, 2012
    Date of Patent: July 1, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Chang Wahn Yu, Gweon Do Jo, Jung Hoon Oh, Kwang Chun Lee, Jae Ho Jung