Patents by Inventor Bang Li LIANG

Bang Li LIANG 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: 20210218433
    Abstract: Cascode power amplifier bias circuits suitable for operating across multiple power supply domains are provided. In certain embodiments, a power amplifier system includes a cascode power amplifier and a multi-domain bias circuit that generates at least a first cascode bias voltage for the cascode power amplifier. The multi-domain bias circuit includes a coarse regulator that generates a regulated voltage based on a power supply voltage that is operable with multiple voltage levels associated with different power supply domains, a bandgap reference circuit that is powered by the regulated voltage and outputs a bandgap reference voltage, a bias voltage generator that generates multiple selectable bias voltages based on the bandgap reference voltage, and a bias voltage selector that chooses the first cascode bias voltage from amongst the selectable bias voltages.
    Type: Application
    Filed: December 29, 2020
    Publication date: July 15, 2021
    Inventors: Bang Li Liang, Thomas Obkircher, Guillaume Alexandre Blin
  • Publication number: 20210132642
    Abstract: According to at least one aspect, a controller having a mode of operation including one of an on mode and an off mode is provided including a voltage supply node, a mode of operation signal node, a powered component, a switching device coupled in series between the voltage supply node and the powered component, a power supply detector coupled to the switching circuit, the voltage supply node, and the mode of operation signal node, the power supply detector being configured to receive a mode of operation signal indicative of the mode of operation of the controller from the mode of operation signal node, determine that the controller is in the off mode based on the mode of operation signal, and control the switching device to prevent a current from passing from the voltage supply node to the powered component responsive to determining that the controller is in the off mode.
    Type: Application
    Filed: October 28, 2020
    Publication date: May 6, 2021
    Inventors: Bang Li Liang, Tom Taoufik Bourdi
  • Publication number: 20210132646
    Abstract: Circuits and devices related to switch controller. In some embodiments, a radio-frequency module can include a packaging substrate configured to receive a plurality of components, and a switching circuit implemented on the packaging substrate. The radio-frequency module can further include a control circuit configured to control operation of the switching circuit. The control circuit can include a regulator configured to generate a plurality of reference voltage levels for the operation of the switching circuit, or to be in a sleep mode, based on a control signal received through a common input node. The control circuit can further include a mode detector in communication with the regulator and configured to provide a first form of the control signal to the common input node to allow the plurality of reference levels to be generated by the regulator, or a second form of the control signal to the common input node to put the regulator in the sleep mode.
    Type: Application
    Filed: November 17, 2020
    Publication date: May 6, 2021
    Inventors: Bang Li LIANG, Peter Harris Robert POPPLEWELL, Gregory Edward BABCOCK
  • Patent number: 10998862
    Abstract: Methods and systems are provided for generating an oscillating signal for use as a clock in digital logic timing. The oscillating signal is generated via a differential RC relaxation oscillator including an oscillator core and biasing circuitry. The oscillator core may be configured such that the oscillating signal it generates is substantially sinusoidal or pseudo-sinusoidal and contains less harmonic content relative to a square wave signal. The biasing circuitry may be configured to have a reduced dependence on temperature so that the biasing values it provides vary less with temperature.
    Type: Grant
    Filed: September 23, 2019
    Date of Patent: May 4, 2021
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventors: Bang Li Liang, Thomas Obkircher, Adrian John Bergsma, Peter Harris Robert Popplewell
  • Publication number: 20200401177
    Abstract: Circuits, systems, and methods to automatically switch modes to provide constant reference voltages are discussed herein. For example, a bandgap reference system may include a first bandgap reference circuit configured to provide a first bandgap reference voltage, a low dropout regulator coupled to the first bandgap reference circuit, a temperature circuit coupled to the low dropout regulator, and a second bandgap reference circuit coupled to the low dropout regulator and the temperature circuit. The second bandgap reference circuit may be configured to configure one or more impedance elements based at least in part on a temperature signal and provide a second bandgap reference voltage based on one or more currents that pass through the one or more impedance elements.
    Type: Application
    Filed: June 18, 2020
    Publication date: December 24, 2020
    Inventor: Bang Li LIANG
  • Patent number: 10838446
    Abstract: Low leakage current switch controller. In some embodiments, a controller for a radio-frequency switch can include a low-dropout regulator configured to generate a plurality of reference voltage levels for operation of a switch, or to be in a sleep mode to conserve power, based on a control signal received through a common input node. The controller can further include a mode detector in communication with the low-dropout regulator, and be configured to provide a first form of the control signal to the common input node to allow the plurality of reference levels to be generated by the low-dropout regulator, or a second form of the control signal to the common input node to put the low-dropout regulator in the sleep mode.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: November 17, 2020
    Assignee: Skyworks Solutions, Inc.
    Inventors: Bang Li Liang, Peter Harris Robert Popplewell, Gregory Edward Babcock
  • Publication number: 20200272182
    Abstract: A front-end module comprises a low-dropout (LDO) voltage regulator, a reference current generator, a power amplifier, and a voltage reference configured to provide a reference voltage to the LDO voltage regulator and the reference current generator. The LDO voltage regulator, reference current generator, power amplifier, and voltage reference are integrated on a first semiconductor die.
    Type: Application
    Filed: February 26, 2020
    Publication date: August 27, 2020
    Inventors: Bang Li Liang, Yasser Khairat Soliman, Adrian John Bergsma, Haoran Yu, Hassan Sarbishaei
  • Publication number: 20200272183
    Abstract: A front-end module comprises a bias network including a current mirror, a junction temperature sensor, an n-bit analog-to-digital converter, an n-bit current source bank configured to automatically set reference current levels for one or more operating temperature regions, and a power amplifier. The bias network, junction temperature sensor, n-bit analog-to-digital converter, n-bit current source bank, and power amplifier are integrated on a first semiconductor die.
    Type: Application
    Filed: February 26, 2020
    Publication date: August 27, 2020
    Inventor: Bang Li Liang
  • Patent number: 10554188
    Abstract: Systems and methods for suppressing transient outputs from an amplifier system are provided. An amplifier having a plurality of bias levels may be controlled to initiate a change in the level of a bias signal provided to the amplifier. The level of the bias signal is ramped from an initial bias level to a final bias level over numerous steps. The steps include at least one step in which the level of the bias signal is between the initial bias level and the final bias level. An amplifier system having multiple stages may be controlled to enable each stage and selectively couple each stage in a sequence that couples an output stage to an output terminal at the completion of the sequence.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: February 4, 2020
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventors: Adrian John Bergsma, Thomas Obkircher, Peihua Ye, Bang Li Liang, Peter Harris Robert Popplewell, William J. Domino
  • Publication number: 20200021249
    Abstract: Methods and systems are provided for generating an oscillating signal for use as a clock in digital logic timing. The oscillating signal is generated via a differential RC relaxation oscillator including an oscillator core and biasing circuitry. The oscillator core may be configured such that the oscillating signal it generates is substantially sinusoidal or pseudo-sinusoidal and contains less harmonic content relative to a square wave signal. The biasing circuitry may be configured to have a reduced dependence on temperature so that the biasing values it provides vary less with temperature.
    Type: Application
    Filed: September 23, 2019
    Publication date: January 16, 2020
    Inventors: Bang Li Liang, Thomas Obkircher, Adrian John Bergsma, Peter Harris Robert Popplewell
  • Patent number: 10461700
    Abstract: Methods and systems are provided for generating an oscillating signal for use as a clock in digital logic timing. The oscillating signal is generated via a differential RC relaxation oscillator including an oscillator core and biasing circuitry. The oscillator core may be configured such that the oscillating signal it generates is substantially sinusoidal or pseudo-sinusoidal and contains less harmonic content relative to a square wave signal. The biasing circuitry may be configured to have a reduced dependence on temperature so that the biasing values it provides vary less with temperature.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: October 29, 2019
    Assignee: SKYWORKS SOLUTIONS, INC.
    Inventors: Bang Li Liang, Thomas Obkircher, Adrian John Bergsma, Peter Harris Robert Popplewell
  • Publication number: 20180138877
    Abstract: Systems and methods for suppressing transient outputs from an amplifier system are provided. An amplifier having a plurality of bias levels may be controlled to initiate a change in the level of a bias signal provided to the amplifier. The level of the bias signal is ramped from an initial bias level to a final bias level over numerous steps. The steps include at least one step in which the level of the bias signal is between the initial bias level and the final bias level. An amplifier system having multiple stages may be controlled to enable each stage and selectively couple each stage in a sequence that couples an output stage to an output terminal at the completion of the sequence.
    Type: Application
    Filed: November 9, 2017
    Publication date: May 17, 2018
    Inventors: Adrian John Bergsma, Thomas Obkircher, Peihua Ye, Bang Li Liang, Peter Harris Robert Popplewell, William J. Domino
  • Publication number: 20180138866
    Abstract: Methods and systems are provided for generating an oscillating signal for use as a clock in digital logic timing. The oscillating signal is generated via a differential RC relaxation oscillator including an oscillator core and biasing circuitry. The oscillator core may be configured such that the oscillating signal it generates is substantially sinusoidal or pseudo-sinusoidal and contains less harmonic content relative to a square wave signal. The biasing circuitry may be configured to have a reduced dependence on temperature so that the biasing values it provides vary less with temperature.
    Type: Application
    Filed: November 9, 2017
    Publication date: May 17, 2018
    Inventors: Bang Li Liang, Thomas Obkircher, Adrian John Bergsma, Peter Harris Robert Popplewell
  • Publication number: 20170300076
    Abstract: Low leakage current switch controller. In some embodiments, a controller for a radio-frequency switch can include a low-dropout regulator configured to generate a plurality of reference voltage levels for operation of a switch, or to be in a sleep mode to conserve power, based on a control signal received through a common input node. The controller can further include a mode detector in communication with the low-dropout regulator, and be configured to provide a first form of the control signal to the common input node to allow the plurality of reference levels to be generated by the low-dropout regulator, or a second form of the control signal to the common input node to put the low-dropout regulator in the sleep mode.
    Type: Application
    Filed: February 28, 2017
    Publication date: October 19, 2017
    Inventors: Bang Li LIANG, Peter Harris Robert POPPLEWELL, Gregory Edward BABCOCK