Patents by Inventor Hamhee Jeon

Hamhee Jeon 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).

  • Publication number: 20180167032
    Abstract: An RF power amplifier includes a quadrature coupler, an in-phase amplifier, a quadrature amplifier, and a feed-forward signal path. The quadrature coupler includes an in-phase input node, a quadrature input node, an isolated node, and an RF signal output node. The in-phase amplifier includes an in-phase amplifier output node coupled to the in-phase input node. The quadrature amplifier includes a quadrature amplifier output node coupled to the quadrature input node. The feed-forward signal path is configured to couple and condition a signal from one of the in-phase amplifier and the quadrature amplifier in order to provide a feed-forward output signal that when provided at the feed-forward output node cancels one or more harmonic signals.
    Type: Application
    Filed: December 12, 2017
    Publication date: June 14, 2018
    Inventors: Hamhee Jeon, Kevin Wesley Kobayashi
  • Patent number: 9948243
    Abstract: A reconfigurable load modulation amplifier having a first power amplifier (PA) configured to be supplied by a first drain voltage and a second PA coupled in parallel with the first PA, wherein the second PA is configured to be supplied by a second drain voltage is disclosed. The reconfigurable load modulation amplifier includes a quadrature coupler configured to combine power from both the first PA and the second PA for output through an output port. Also included is control circuitry configured to set at least one of the first drain voltage and the second drain voltage such that the first drain voltage is different than the second drain voltage. In at least one embodiment, the control circuitry is further configured to dynamically adjust at least one of the first drain voltage and the second drain voltage such that the first drain voltage is different than the second drain voltage.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: April 17, 2018
    Assignee: Qorvo US, Inc.
    Inventors: Kevin Wesley Kobayashi, Hamhee Jeon
  • Patent number: 9887671
    Abstract: A reconfigurable load modulation amplifier having a carrier amplifier and a peak amplifier that are coupled in parallel is disclosed. The peak amplifier provides additional power amplification when the carrier amplifier is driven into saturation. A quadrature coupler coupled between the carrier amplifier and the peak amplifier is configured to combine power from both the carrier amplifier and the peak amplifier for output through an output load terminal. The reconfigurable load modulation amplifier further includes control circuitry coupled to an isolation port of the quadrature coupler and configured to provide adjustable impedance at the isolation port of the quadrature coupler. As such, impedance at the isolation port of the quadrature coupler is tunable such that at least a carrier or peak amplifier is presented with a quadrature coupler load impedance that ranges from around about half an output load termination impedance to around about twice the output load termination impedance.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: February 6, 2018
    Assignee: Qorvo US, Inc.
    Inventors: Kevin Wesley Kobayashi, Hamhee Jeon
  • Patent number: 9780733
    Abstract: Radio frequency (RF) amplification devices are disclosed that include Doherty amplification circuits and methods of operating the same. In one embodiment, a Doherty amplification circuit includes a main carrier RF amplifier, a peaking RF amplifier, and a periodic quadrature coupler. To provide Doherty amplification, the peaking RF amplifier is configured to be deactivated while an RF signal is below a threshold level and is configured to be activated while the RF signal is above the threshold level. The periodic quadrature coupler is configured to combine a first RF split signal from the main carrier RF amplifier and a second RF split signal from the peaking RF amplifier into the RF signal, such that the RF signal is output from an output port while the peaking RF amplifier is activated. The periodic quadrature coupler allows the Doherty amplification circuit to provide broadband amplification in various RF communication bands.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: October 3, 2017
    Assignee: Qorvo US, Inc.
    Inventors: Hamhee Jeon, Kevin Wesley Kobayashi
  • Publication number: 20170019072
    Abstract: A reconfigurable load modulation amplifier having a carrier amplifier and a peak amplifier that are coupled in parallel is disclosed. The peak amplifier provides additional power amplification when the carrier amplifier is driven into saturation. A quadrature coupler coupled between the carrier amplifier and the peak amplifier is configured to combine power from both the carrier amplifier and the peak amplifier for output through an output load terminal. The reconfigurable load modulation amplifier further includes control circuitry coupled to an isolation port of the quadrature coupler and configured to provide adjustable impedance at the isolation port of the quadrature coupler. As such, impedance at the isolation port of the quadrature coupler is tunable such that at least a carrier or peak amplifier is presented with a quadrature coupler load impedance that ranges from around about half an output load termination impedance to around about twice the output load termination impedance.
    Type: Application
    Filed: September 28, 2016
    Publication date: January 19, 2017
    Inventors: Kevin Wesley Kobayashi, Hamhee Jeon
  • Publication number: 20170019071
    Abstract: A reconfigurable load modulation amplifier having a first power amplifier (PA) configured to be supplied by a first drain voltage and a second PA coupled in parallel with the first PA, wherein the second PA is configured to be supplied by a second drain voltage is disclosed. The reconfigurable load modulation amplifier includes a quadrature coupler configured to combine power from both the first PA and the second PA for output through an output port. Also included is control circuitry configured to set at least one of the first drain voltage and the second drain voltage such that the first drain voltage is different than the second drain voltage. In at least one embodiment, the control circuitry is further configured to dynamically adjust at least one of the first drain voltage and the second drain voltage such that the first drain voltage is different than the second drain voltage.
    Type: Application
    Filed: September 28, 2016
    Publication date: January 19, 2017
    Inventors: Kevin Wesley Kobayashi, Hamhee Jeon
  • Patent number: 9484865
    Abstract: A reconfigurable load modulation amplifier having a carrier amplifier and a peak amplifier that are coupled in parallel is disclosed. The peak amplifier provides additional power amplification when the carrier amplifier is driven into saturation. A quadrature coupler coupled between the carrier amplifier and the peak amplifier is configured to combine power from both the carrier amplifier and the peak amplifier for output through an output load terminal. The reconfigurable load modulation amplifier further includes control circuitry coupled to an isolation port of the quadrature coupler and configured to provide adjustable impedance at the isolation port of the quadrature coupler. As such, impedance at the isolation port of the quadrature coupler is tunable such that at least a carrier or peak amplifier is presented with a quadrature coupler load impedance that ranges from around about half an output load termination impedance to around about twice the output load termination impedance.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: November 1, 2016
    Assignee: Qorvo US, Inc.
    Inventors: Kevin Wesley Kobayashi, Hamhee Jeon
  • Patent number: 9431969
    Abstract: Radio frequency (RF) amplification devices are disclosed that include Doherty amplification circuits and control circuits along with methods of operating the same. In one embodiment, the Doherty amplification circuit includes a quadrature coupler having an isolation port and a tunable impedance load coupled to the isolation port and configured to provide a tunable impedance. The control circuit is configured to tune the tunable impedance of the tunable impedance load at the isolation port dynamically as a function of the RF power of the Doherty amplification circuit. In this manner, the control circuit can provide dynamic load modulation, thereby increasing the power efficiency of the Doherty amplification circuit, particularly at backed-off power levels. The load modulation provided by the control circuit also allows the Doherty amplification circuit to provide broadband amplification in various RF communication bands.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: August 30, 2016
    Assignee: RF Micro Devices, Inc.
    Inventors: Hamhee Jeon, Kevin Wesley Kobayashi
  • Patent number: 9397617
    Abstract: Radio frequency (RF) amplification devices are disclosed that include Doherty amplification circuits and methods of operating the same. In one embodiment, a Doherty amplification circuit includes a main carrier RF amplifier, a peaking RF amplifier, and a periodic quadrature coupler. To provide Doherty amplification, the peaking RF amplifier is configured to be deactivated while an RF signal is below a threshold level and is configured to be activated while the RF signal is above the threshold level. The periodic quadrature coupler is configured to combine a first RF split signal from the main carrier RF amplifier and a second RF split signal from the peaking RF amplifier into the RF signal, such that the RF signal is output from an output port while the peaking RF amplifier is activated. The periodic quadrature coupler allows the Doherty amplification circuit to provide broadband amplification in various RF communication bands.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: July 19, 2016
    Assignee: RF Micro Devices, Inc.
    Inventors: Hamhee Jeon, Kevin Wesley Kobayashi
  • Patent number: 9391564
    Abstract: Radio frequency (RF) amplification devices are disclosed that include Doherty amplification circuits and control circuits along with methods of operating the same. In one embodiment, the Doherty amplification circuit includes a quadrature coupler having an isolation port and a tunable impedance load coupled to the isolation port and configured to provide a tunable impedance. The control circuit is configured to tune the tunable impedance of the tunable impedance load at the isolation port dynamically as a function of the RF power of the Doherty amplification circuit. In this manner, the control circuit can provide dynamic load modulation, thereby increasing the power efficiency of the Doherty amplification circuit, particularly at backed-off power levels. The load modulation provided by the control circuit also allows the Doherty amplification circuit to provide broadband amplification in various RF communication bands.
    Type: Grant
    Filed: December 11, 2013
    Date of Patent: July 12, 2016
    Assignee: RF Micro Devices, Inc.
    Inventors: Hamhee Jeon, Kevin Wesley Kobayashi
  • Publication number: 20160142023
    Abstract: Radio frequency (RF) amplification devices are disclosed that include Doherty amplification circuits and methods of operating the same. In one embodiment, a Doherty amplification circuit includes a main carrier RF amplifier, a peaking RF amplifier, and a periodic quadrature coupler. To provide Doherty amplification, the peaking RF amplifier is configured to be deactivated while an RF signal is below a threshold level and is configured to be activated while the RF signal is above the threshold level. The periodic quadrature coupler is configured to combine a first RF split signal from the main carrier RF amplifier and a second RF split signal from the peaking RF amplifier into the RF signal, such that the RF signal is output from an output port while the peaking RF amplifier is activated. The periodic quadrature coupler allows the Doherty amplification circuit to provide broadband amplification in various RF communication bands.
    Type: Application
    Filed: January 26, 2016
    Publication date: May 19, 2016
    Inventors: Hamhee Jeon, Kevin Wesley Kobayashi
  • Publication number: 20150091653
    Abstract: A reconfigurable load modulation amplifier having a carrier amplifier and a peak amplifier that are coupled in parallel is disclosed. The peak amplifier provides additional power amplification when the carrier amplifier is driven into saturation. A quadrature coupler coupled between the carrier amplifier and the peak amplifier is configured to combine power from both the carrier amplifier and the peak amplifier for output through an output load terminal. The reconfigurable load modulation amplifier further includes control circuitry coupled to an isolation port of the quadrature coupler and configured to provide adjustable impedance at the isolation port of the quadrature coupler. As such, impedance at the isolation port of the quadrature coupler is tunable such that at least a carrier or peak amplifier is presented with a quadrature coupler load impedance that ranges from around about half an output load termination impedance to around about twice the output load termination impedance.
    Type: Application
    Filed: September 30, 2014
    Publication date: April 2, 2015
    Inventors: Kevin Wesley Kobayashi, Hamhee Jeon
  • Publication number: 20140375389
    Abstract: Radio frequency (RF) amplification devices are disclosed that include Doherty amplification circuits and methods of operating the same. In one embodiment, a Doherty amplification circuit includes a main carrier RF amplifier, a peaking RF amplifier, and a periodic quadrature coupler. To provide Doherty amplification, the peaking RF amplifier is configured to be deactivated while an RF signal is below a threshold level and is configured to be activated while the RF signal is above the threshold level. The periodic quadrature coupler is configured to combine a first RF split signal from the main carrier RF amplifier and a second RF split signal from the peaking RF amplifier into the RF signal, such that the RF signal is output from an output port while the peaking RF amplifier is activated. The periodic quadrature coupler allows the Doherty amplification circuit to provide broadband amplification in various RF communication bands.
    Type: Application
    Filed: June 25, 2014
    Publication date: December 25, 2014
    Inventors: Hamhee Jeon, Kevin Wesley Kobayashi
  • Publication number: 20140159818
    Abstract: Radio frequency (RF) amplification devices are disclosed that include Doherty amplification circuits and control circuits along with methods of operating the same. In one embodiment, the Doherty amplification circuit includes a quadrature coupler having an isolation port and a tunable impedance load coupled to the isolation port and configured to provide a tunable impedance. The control circuit is configured to tune the tunable impedance of the tunable impedance load at the isolation port dynamically as a function of the RF power of the Doherty amplification circuit. In this manner, the control circuit can provide dynamic load modulation, thereby increasing the power efficiency of the Doherty amplification circuit, particularly at backed-off power levels. The load modulation provided by the control circuit also allows the Doherty amplification circuit to provide broadband amplification in various RF communication bands.
    Type: Application
    Filed: December 11, 2013
    Publication date: June 12, 2014
    Applicant: RF Micro Devices, Inc.
    Inventors: Hamhee Jeon, Kevin Wesley Kobayashi
  • Patent number: 7944311
    Abstract: A system for a power transmitter may be provided. The system may include a first amplifier stage having at least a first transistor and a second transistor that are connected in a first cascode configuration; a second amplifier stage having at least a third transistor and a fourth transistor that are connected in a second cascode configuration, where the first transistor receives a system input of the power transmitter, where the second transistor is connected to the third transistor, and where the fourth transistor provides a system output of the power transmitter; and a feedback network that connects a first gate or base of the fourth transistor with a second gate or base of the second transistor.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: May 17, 2011
    Assignees: Samsung Electro-Mechanics Company, Ltd., Georgia Tech Research Corporation
    Inventors: Hamhee Jeon, Chang-Ho Lee, Joy Laskar