Patents by Inventor Sabah Khesbak

Sabah Khesbak 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: 10651802
    Abstract: Envelope trackers providing compensation for power amplifier output load variation are provided herein. In certain configurations, a radio frequency (RF) system includes an antenna, a power amplifier that receives a radio frequency signal and outputs an amplified radio frequency signal to the antenna, a plurality of detectors coupled to the power amplifier and operable to generate a plurality of detection signals, and an envelope tracker that controls a supply voltage of the power amplifier based on an envelope of the radio frequency signal. The envelope tracker processes the plurality of detection signals to generate a load variation detection signal indicating a change in an output load of the power amplifier arising from a change in a voltage standing wave ratio (VSWR) of the antenna. Additionally, the envelope tracker adjusts a gain of the power amplifier based on the load variation detection signal.
    Type: Grant
    Filed: February 1, 2019
    Date of Patent: May 12, 2020
    Assignee: Skyworks Solutions, Inc.
    Inventors: Sabah Khesbak, Serge Francois Drogi
  • Publication number: 20200127619
    Abstract: A variable load power amplifier that improves the performance of a power amplifier that provides both envelope tracking (ET) and average power tracking (APT). The variable load power amplifier can include a plurality of amplifiers that are each selectively connectable into one of a plurality of parallel combinations, each of the plurality of parallel combinations characterized by a corresponding load line. The variable load power amplifier can also include a plurality of control elements arranged to selectively connect one or more of the plurality of amplifiers into one of the plurality of parallel combinations, each of the plurality of control elements having a respective input terminal provided to receive a respective control signal, each of the plurality of control elements responsive to the respective control signal.
    Type: Application
    Filed: April 30, 2019
    Publication date: April 23, 2020
    Inventors: Sabah KHESBAK, Florinel G. BALTEANU, Hardik Bhupendra MODI
  • Patent number: 10615757
    Abstract: High bandwidth envelope trackers are provided herein. In certain embodiments, an envelope tracking system for a power amplifier includes a switching regulator that operates in combination with a high bandwidth amplifier to generate a power amplifier supply voltage for the power amplifier based on an envelope of a radio frequency (RF) signal amplified by the power amplifier. The high bandwidth amplifier includes an output that generates an output current for adjusting the power amplifier supply voltage, a first input that receives a reference signal, and a second input that receives an envelope signal indicating the envelope of the RF signal. The second input has lower input impedance than the first input to provide a rapid transient response and high envelope tracking bandwidth.
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: April 7, 2020
    Assignee: Skyworks Solutions, Inc.
    Inventors: Florinel G. Balteanu, Serge Francois Drogi, Sabah Khesbak, Hardik Bhupendra Modi
  • Publication number: 20200099343
    Abstract: Apparatus and methods for envelope tracking systems with automatic mode selection are provided herein. In certain configurations, a power amplifier system includes a power amplifier configured to provide amplification to a radio frequency signal and to receive power from a power amplifier supply voltage, and an envelope tracker including a signal bandwidth detection circuit configured to generate a detected bandwidth signal based on processing an envelope signal corresponding to an envelope of the radio frequency signal. The envelope tracker further includes a switch bank configured to receive a plurality of regulated voltages, a filter configured to filter an output of the switch bank to generate the power amplifier supply voltage, and a mode control circuit configured to control a filtering characteristic of the filter based on the detected bandwidth signal.
    Type: Application
    Filed: September 10, 2019
    Publication date: March 26, 2020
    Inventors: Sabah Khesbak, Serge Francois Drogi, Florinel G. Balteanu
  • Publication number: 20200067406
    Abstract: Described herein are systems, architectures, circuits, devices, and methods for a DC-DC converter that dynamically adjusts a supply voltage to a power amplifier based on the number of resource blocks in a signal to be transmitted. The disclosed technologies estimate the number of resource blocks in a signal, generate a signal corresponding to the estimated number of resource blocks, and modify a supply voltage based on the generated signal. These technologies can be used to increase the efficiency of power amplifier systems for cellular signals being transmitted that have fewer resource blocks than is typically assumed (e.g., at least 100 resource blocks).
    Type: Application
    Filed: September 3, 2019
    Publication date: February 27, 2020
    Inventors: Sabah Khesbak, Florinel G. Balteanu, Roman Zbigniew Arkiszewski
  • Patent number: 10516368
    Abstract: Fast envelope tracking systems are provided herein. In certain embodiments, an envelope tracking system for a power amplifier includes a switching regulator and a differential error amplifier configured to operate in combination with one another to generate a power amplifier supply voltage for the power amplifier based on an envelope of a radio frequency (RF) signal amplified by the power amplifier. The envelope tracking system further includes a differential envelope amplifier configured to amplify a differential envelope signal to generate a single-ended envelope signal that changes in relation to the envelope of the RF signal. Additionally, the differential error amplifier generates an output current operable to adjust a voltage level of the power amplifier supply voltage based on comparing the single-ended envelope signal to a reference signal.
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: December 24, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Florinel G. Balteanu, Serge Francois Drogi, Sabah Khesbak, Hardik Bhupendra Modi
  • Publication number: 20190319720
    Abstract: Apparatus and methods of calibrating a power amplifier system to compensate for envelope amplitude misalignment are provided. In certain configurations, a method of calibrating a power amplifier system includes generating a supply voltage of a power amplifier using an envelope tracker based on shaping a scaled envelope signal using shaping data generated at a target gain compression, controlling a variable gain of a variable gain amplifier based on a gain control level signal, changing the variable gain by adjusting the gain control level signal using a calibration module, monitoring an output of the power amplifier to determine an amount of variable gain at which a detected gain compression of the power amplifier corresponds to the target gain compression of the shaping data, and calibrating the power amplifier system to compensate for envelope amplitude misalignment based on the determined amount of variable gain.
    Type: Application
    Filed: June 26, 2019
    Publication date: October 17, 2019
    Inventors: David Steven Ripley, Sabah Khesbak, Benjamin Bartram, Kevin Lee Cobley, Robert Astle Henshaw, Julian Hildersley, Robert John Thompson
  • Patent number: 10404166
    Abstract: Described herein are systems, architectures, circuits, devices, and methods for a DC-DC converter that dynamically adjusts a supply voltage to a power amplifier based on the number of resource blocks in a signal to be transmitted. The disclosed technologies estimate the number of resource blocks in a signal, generate a signal corresponding to the estimated number of resource blocks, and modify a supply voltage based on the generated signal. The disclosed DC-DC converters can be integrated into systems that employ power management strategies such as average power tracking (“APT”). In addition, the disclosed technologies can be used to improve existing APT-based systems.
    Type: Grant
    Filed: May 30, 2018
    Date of Patent: September 3, 2019
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventors: Sabah Khesbak, Florinel G. Balteanu, Roman Zbigniew Arkiszewski
  • Patent number: 10382147
    Abstract: Methods of calibrating a power amplifier system to compensate for envelope amplitude misalignment are provided. In certain configurations, a method of calibrating a power amplifier system includes amplifying a radio frequency signal from a transceiver using a power amplifier and generating a supply voltage of the power amplifier using an envelope tracker, including generating a scaled envelope signal based on a power control level signal and an envelope signal, and shaping the scaled envelope signal using a shaping table generated at a target gain compression. The method further includes changing a scaling of the scaled envelope signal using a calibration module, monitoring an output of the power amplifier to determine an amount of scaling of the scaled envelope signal at which a detected gain compression of the power amplifier corresponds to the target gain compression of the shaping table, and calibrating the power amplifier system based on the determination.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: August 13, 2019
    Assignees: Skyworks Solutions, Inc., SnapTrack, Inc.
    Inventors: David Steven Ripley, Sabah Khesbak, Benjamin Bartram, Kevin Lee Cobley, Robert Astle Henshaw, Julian Hildersley, Robert John Thompson
  • Patent number: 10333470
    Abstract: Apparatus and methods for envelope tracking systems are provided. In certain configurations, an envelope tracking system includes a digital filter that generates a filtered envelope signal based on a digital envelope signal representing an envelope of a radio frequency signal, a buck converter controllable by the filtered envelope signal and including an output electrically connected to a power amplifier supply voltage, a digital-to-analog converter module including an output electrically connected to the output of the buck converter and that provides an output current, and a digital shaping and delay circuit configured to generate a shaped envelope signal based on shaping the filtered envelope signal. The shaped envelope signal controls a magnitude of the output current, and the digital shaping and delay circuit controls a delay of the shaped envelope signal to align the output of the digital-to-analog converter module and the output of the buck converter.
    Type: Grant
    Filed: March 15, 2018
    Date of Patent: June 25, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Florinel G. Balteanu, Sabah Khesbak, Yevgeniy A. Tkachenko, David Steven Ripley, Robert John Thompson
  • Publication number: 20190165736
    Abstract: Envelope trackers providing compensation for power amplifier output load variation are provided herein. In certain configurations, a radio frequency (RF) system includes an antenna, a power amplifier that receives a radio frequency signal and outputs an amplified radio frequency signal to the antenna, a plurality of detectors coupled to the power amplifier and operable to generate a plurality of detection signals, and an envelope tracker that controls a supply voltage of the power amplifier based on an envelope of the radio frequency signal. The envelope tracker processes the plurality of detection signals to generate a load variation detection signal indicating a change in an output load of the power amplifier arising from a change in a voltage standing wave ratio (VSWR) of the antenna. Additionally, the envelope tracker adjusts a gain of the power amplifier based on the load variation detection signal.
    Type: Application
    Filed: February 1, 2019
    Publication date: May 30, 2019
    Inventors: Sabah Khesbak, Serge Francois Drogi
  • Patent number: 10277177
    Abstract: A variable load power amplifier that improves the performance of a power amplifier that provides both envelope tracking (ET) and average power tracking (APT). The variable load power amplifier can include a plurality of amplifiers that are each selectively connectable into one of a plurality of parallel combinations, each of the plurality of parallel combinations characterized by a corresponding load line. The variable load power amplifier can also include a plurality of control elements arranged to selectively connect one or more of the plurality of amplifiers into one of the plurality of parallel combinations, each of the plurality of control elements having a respective input terminal provided to receive a respective control signal, each of the plurality of control elements responsive to the respective control signal.
    Type: Grant
    Filed: June 5, 2018
    Date of Patent: April 30, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Sabah Khesbak, Florinel G. Balteanu, Hardik Bhupendra Modi
  • Patent number: 10236831
    Abstract: Envelope trackers providing compensation for power amplifier output load variation are provided herein. In certain configurations, a radio frequency (RF) system includes a power amplifier that amplifies an RF signal, an output detector coupled to an output of the power amplifier and that generates an output detection signal, an input detector coupled to an input of the power amplifier and that generates an input detection signal, and an envelope tracker that generates a power amplifier supply voltage for the power amplifier based on an envelope of the RF signal. The envelope tracker compensates the power amplifier for output load variation based on the output detection signal and the input detection signal.
    Type: Grant
    Filed: May 2, 2018
    Date of Patent: March 19, 2019
    Assignee: Skyworks Solutions, Inc.
    Inventors: Sabah Khesbak, Serge Francois Drogi
  • Publication number: 20190020315
    Abstract: Apparatus and methods for envelope tracking systems with automatic mode selection are provided herein. In certain configurations, a power amplifier system includes a power amplifier configured to provide amplification to a radio frequency signal and to receive power from a power amplifier supply voltage, and an envelope tracker including a signal bandwidth detection circuit configured to generate a detected bandwidth signal based on processing an envelope signal corresponding to an envelope of the radio frequency signal. The envelope tracker further includes a switch bank configured to receive a plurality of regulated voltages, a filter configured to filter an output of the switch bank to generate the power amplifier supply voltage, and a mode control circuit configured to control a filtering characteristic of the filter based on the detected bandwidth signal.
    Type: Application
    Filed: September 20, 2018
    Publication date: January 17, 2019
    Inventors: Sabah Khesbak, Serge Francois Drogi, Florinel G. Balteanu
  • Publication number: 20180375476
    Abstract: Fast envelope tracking systems are provided herein. In certain embodiments, an envelope tracking system for a power amplifier includes a switching regulator and a differential error amplifier configured to operate in combination with one another to generate a power amplifier supply voltage for the power amplifier based on an envelope of a radio frequency (RF) signal amplified by the power amplifier. The envelope tracking system further includes a differential envelope amplifier configured to amplify a differential envelope signal to generate a single-ended envelope signal that changes in relation to the envelope of the RF signal. Additionally, the differential error amplifier generates an output current operable to adjust a voltage level of the power amplifier supply voltage based on comparing the single-ended envelope signal to a reference signal.
    Type: Application
    Filed: June 19, 2018
    Publication date: December 27, 2018
    Inventors: Florinel G. Balteanu, Serge Francois Drogi, Sabah Khesbak, Hardik Bhupendra Modi
  • Publication number: 20180375483
    Abstract: High bandwidth envelope trackers are provided herein. In certain embodiments, an envelope tracking system for a power amplifier includes a switching regulator that operates in combination with a high bandwidth amplifier to generate a power amplifier supply voltage for the power amplifier based on an envelope of a radio frequency (RF) signal amplified by the power amplifier. The high bandwidth amplifier includes an output that generates an output current for adjusting the power amplifier supply voltage, a first input that receives a reference signal, and a second input that receives an envelope signal indicating the envelope of the RF signal. The second input has lower input impedance than the first input to provide a rapid transient response and high envelope tracking bandwidth.
    Type: Application
    Filed: June 19, 2018
    Publication date: December 27, 2018
    Inventors: Florinel G. Balteanu, Serge Francois Drogi, Sabah Khesbak, Hardik Bhupendra Modi
  • Publication number: 20180351454
    Abstract: Described herein are systems, architectures, circuits, devices, and methods for a DC-DC converter that dynamically adjusts a supply voltage to a power amplifier based on the number of resource blocks in a signal to be transmitted. The disclosed technologies estimate the number of resource blocks in a signal, generate a signal corresponding to the estimated number of resource blocks, and modify a supply voltage based on the generated signal. The disclosed DC-DC converters can be integrated into systems that employ power management strategies such as average power tracking (“APT”). In addition, the disclosed technologies can be used to improve existing APT-based systems.
    Type: Application
    Filed: May 30, 2018
    Publication date: December 6, 2018
    Inventors: Sabah Khesbak, Florinel G. Balteanu, Roman Zbigniew Arkiszewski
  • Publication number: 20180331659
    Abstract: Envelope trackers providing compensation for power amplifier output load variation are provided herein. In certain configurations, a radio frequency (RF) system includes a power amplifier that amplifies an RF signal, an output detector coupled to an output of the power amplifier and that generates an output detection signal, an input detector coupled to an input of the power amplifier and that generates an input detection signal, and an envelope tracker that generates a power amplifier supply voltage for the power amplifier based on an envelope of the RF signal. The envelope tracker compensates the power amplifier for output load variation based on the output detection signal and the input detection signal.
    Type: Application
    Filed: May 2, 2018
    Publication date: November 15, 2018
    Inventors: Sabah Khesbak, Serge Francois Drogi
  • Patent number: 10110169
    Abstract: Apparatus and methods for envelope tracking systems with automatic mode selection are provided herein. In certain configurations, a power amplifier system includes a power amplifier that amplifies a radio frequency signal and that receives power from a power amplifier supply voltage. The power amplifier system further includes an envelope tracker that generates the power amplifier supply voltage based on an envelope signal corresponding to an envelope of the radio frequency signal. The envelope tracker includes a signal bandwidth detection circuit that processes the envelope signal to generate a detected bandwidth signal, and a mode control circuit that controls a mode of the error amplifier based on the detected signal bandwidth.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: October 23, 2018
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventors: Sabah Khesbak, Serge Francois Drogi, Florinel G. Balteanu
  • Publication number: 20180302036
    Abstract: Apparatus and methods for envelope tracking systems are provided. In certain configurations, an envelope tracking system includes a digital filter that generates a filtered envelope signal based on a digital envelope signal representing an envelope of a radio frequency signal, a buck converter controllable by the filtered envelope signal and including an output electrically connected to a power amplifier supply voltage, a digital-to-analog converter module including an output electrically connected to the output of the buck converter and that provides an output current, and a digital shaping and delay circuit configured to generate a shaped envelope signal based on shaping the filtered envelope signal. The shaped envelope signal controls a magnitude of the output current, and the digital shaping and delay circuit controls a delay of the shaped envelope signal to align the output of the digital-to-analog converter module and the output of the buck converter.
    Type: Application
    Filed: March 15, 2018
    Publication date: October 18, 2018
    Inventors: Florinel G. Balteanu, Sabah Khesbak, Yevgeniy A. Tkachenko, David Steven Ripley, Robert John Thompson