Patents by Inventor Saihua Lin

Saihua Lin 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: 9871488
    Abstract: A method and apparatus for transmitting a communication signal through a dual-mode power amplifier may include amplifying a communication signal by a first amplifier and/or a second amplifier of the dual-mode power amplifier based on a desired transmit output power. The output of the first amplifier may be selectively coupled through a configurable inductive coupler to an antenna.
    Type: Grant
    Filed: January 28, 2015
    Date of Patent: January 16, 2018
    Assignee: QUALCOMM Incorporated
    Inventor: Saihua Lin
  • Patent number: 9823678
    Abstract: A voltage regulator includes: a difference amplifier with first input terminal connected to a reference voltage; a first transistor having a first terminal connected to a supply voltage, a control terminal connected to the output terminal of the difference amplifier, and a second terminal configured to supply a regulated voltage to a load; a feedback circuit connected to the second terminal of the first transistor and configured to supply a feedback voltage to a second input terminal of the difference amplifier; and a current compensator configured to draw a compensation current from the first transistor when a load current supplied by the first transistor to the load is less than a threshold current, thereby increasing the first current through the first transistor, and configured to draw substantially no compensation current from the first transistor when the load current is greater than or equal to the threshold current.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: November 21, 2017
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventor: Saihua Lin
  • Patent number: 9755595
    Abstract: A device includes: a transistor having an input terminal configured to receive an input signal and to amplify the input signal; a bias current source configured to set a bias current of the input terminal of the transistor, the bias current source having a control input for receiving a control signal for selecting the bias current to have one of a plurality of selectable bias current levels; a bias resistance connected between the bias current source and the input terminal of the transistor; a bypass switch for selectively bypassing a first part of the bias resistance; and a control circuit for controlling the bypass switch to bypass the part of the bias resistance for a predefined time period in response to a change in the bias current level, and for controlling the bypass switch to stop bypassing the first part of the bias resistance after the predefined time period expires.
    Type: Grant
    Filed: April 15, 2016
    Date of Patent: September 5, 2017
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventor: Saihua Lin
  • Patent number: 9692368
    Abstract: An apparatus includes amplification circuitry configured to amplify a radio frequency (RF) signal. The apparatus also includes differential inductors coupled to an output of the amplification circuitry. The differential inductors include a first inductor serially coupled to a second inductor, and the differential inductors are configured to filter the RF signal and to provide a differential output.
    Type: Grant
    Filed: September 9, 2014
    Date of Patent: June 27, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Saihua Lin, Anup Savla, Mounir Youssef Bohsali
  • Patent number: 9548774
    Abstract: A method and apparatus are disclosed for generating a quadrature signal that may be used to modulate and/or demodulate communication signals transmitted between communication devices. A quadrature signal generator may include a control block, a mixer, and a filter. The control block may generate a reference signal and a filter control signal based on an input clock signal. The mixer may generate a mixer output signal based on the input clock signal and the reference signal. The filter, controlled by the filter control signal, may filter the mixer output signal to suppress a band of frequencies within the mixer output signal.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: January 17, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Saihua Lin, Jianlei Shi
  • Patent number: 9543900
    Abstract: A transceiver configured to transmit data in a plurality of operating modes including a Wi-Fi mode and two or more different Bluetooth power modes, the transceiver comprising: a first power amplifier configured to amplify Bluetooth signals; a second power amplifier configured to amplify Wi-Fi signals; an antenna coupled to the second power amplifier; and a tunable load circuit, coupled between the first amplifier and the second amplifier, configured to provide a different load impedance for each of the plurality of operating modes, the tunable load circuit consisting of: two impedance paths coupled in parallel between output terminals of the first and second amplifiers; and a number of shunt paths coupled between the tunable load circuit and ground potential.
    Type: Grant
    Filed: June 19, 2015
    Date of Patent: January 10, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Saihua Lin, Jonghoon Choi
  • Publication number: 20160373064
    Abstract: A transceiver configured to transmit data in a plurality of operating modes including a Wi-Fi mode and two or more different Bluetooth power modes, the transceiver comprising: a first power amplifier configured to amplify Bluetooth signals; a second power amplifier configured to amplify Wi-Fi signals; an antenna coupled to the second power amplifier; and a tunable load circuit, coupled between the first amplifier and the second amplifier, configured to provide a different load impedance for each of the plurality of operating modes, the tunable load circuit consisting of: two impedance paths coupled in parallel between output terminals of the first and second amplifiers; and a number of shunt paths coupled between the tunable load circuit and ground potential.
    Type: Application
    Filed: June 19, 2015
    Publication date: December 22, 2016
    Inventors: Saihua Lin, Jonghoon Choi
  • Patent number: 9509256
    Abstract: An apparatus includes: a plurality of amplification stages, each stage comprising a cascode transistor; and a bridge circuit coupled between gate terminals of cascode transistors in two adjacent stages of the plurality of amplification stages, the bridge circuit including a plurality of diodes.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: November 29, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Saihua Lin, Anup Savla
  • Patent number: 9490886
    Abstract: Exemplary embodiments are directed to a beamforming device. A device may include at least one receive path; and an amplifier coupled to an output of each receive path. The device configured to process each a signal from each receive path in at least one of a voltage domain and a current domain.
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: November 8, 2016
    Assignee: QUALCOMM Incorporated
    Inventor: Saihua Lin
  • Patent number: 9473101
    Abstract: An amplifier is disclosed that may include a filter, such as a notch-filter, to filter an output signal provided by the amplifier. The included filter may suppress and/or reduce a gain of the amplifier for a particular range of frequencies. In one embodiment, a frequency response of the filter may be determined by one or more reactive components included within the amplifier. In at least one embodiment, the amplifier may include two or more mutual inductors to reduce the gain of the amplifier when operated at or near a predetermined frequency. In another embodiment, the amplifier may include one or more variable capacitors that may enable the frequency response of the filter to be changed and/or modified.
    Type: Grant
    Filed: February 9, 2015
    Date of Patent: October 18, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Alan Ngar Loong Chan, Saihua Lin
  • Publication number: 20160248460
    Abstract: A method and apparatus are disclosed for generating a quadrature signal that may be used to modulate and/or demodulate communication signals transmitted between communication devices. A quadrature signal generator may include a control block, a mixer, and a filter. The control block may generate a reference signal and a filter control signal based on an input clock signal. The mixer may generate a mixer output signal based on the input clock signal and the reference signal. The filter, controlled by the filter control signal, may filter the mixer output signal to suppress a band of frequencies within the mixer output signal.
    Type: Application
    Filed: February 19, 2015
    Publication date: August 25, 2016
    Inventors: Saihua Lin, Jianlei Shi
  • Publication number: 20160233843
    Abstract: An amplifier is disclosed that may include a filter, such as a notch-filter, to filter an output signal provided by the amplifier. The included filter may suppress and/or reduce a gain of the amplifier for a particular range of frequencies. In one embodiment, a frequency response of the filter may be determined by one or more reactive components included within the amplifier. In at least one embodiment, the amplifier may include two or more mutual inductors to reduce the gain of the amplifier when operated at or near a predetermined frequency. In another embodiment, the amplifier may include one or more variable capacitors that may enable the frequency response of the filter to be changed and/or modified.
    Type: Application
    Filed: February 9, 2015
    Publication date: August 11, 2016
    Inventors: Alan Ngar Loong Chan, Saihua Lin
  • Patent number: 9407206
    Abstract: A phased array architecture configured for current reuse is disclosed. In an exemplary embodiment, an apparatus includes a current mode phase rotator (PR) module configured to generate phase shifted in-phase (I) and quadrature-phase (Q) current signals, and a current mode residual sideband (RSB) correction module configured to correct residual sideband error associated with the phase shifted I and Q current signals. The RSB correction module and the PR module form a phased array element configured to reuse a DC supply current.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: August 2, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Saihua Lin, Roger Brockenbrough
  • Publication number: 20160218674
    Abstract: A method and apparatus are disclosed for transmitting a communication signal through a dual-mode power amplifier. In some embodiments, a communication signal may be amplified by a first amplifier and/or a second amplifier of the dual-mode power amplifier based on a desired transmit output power. The output of the first amplifier may be selectively coupled through a configurable inductive coupler to an antenna.
    Type: Application
    Filed: January 28, 2015
    Publication date: July 28, 2016
    Inventor: Saihua Lin
  • Patent number: 9397614
    Abstract: An apparatus includes a first capacitor, an inductor coupled to the first capacitor, and a second capacitor coupled to the inductor. The second capacitor is coupled to a first output of a differential amplifier.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: July 19, 2016
    Assignee: Qualcomm Incorporated
    Inventors: Saihua Lin, Anup Savla
  • Patent number: 9391651
    Abstract: A method and apparatus are disclosed for a configurable amplifier. When operating in a first operating mode, the configurable amplifier may amplify a communication signal and may cancel or attenuate a second harmonic component associated with the communication signal. When operating in a second operating mode, the configurable amplifier may amplify the communication signal without cancelling or attenuating the second harmonic component associated with the communication signal.
    Type: Grant
    Filed: April 7, 2015
    Date of Patent: July 12, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Saihua Lin, Chao Lu, Cheng-Han Wang
  • Patent number: 9369097
    Abstract: An apparatus includes a first path tuned to a first frequency band and a second path tuned to a second frequency band. The apparatus also includes cross-coupled circuitry having a first input coupled to the first path and a second input coupled to the second path and having a first output coupled to the second path and a second output coupled to the first path.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: June 14, 2016
    Assignee: Qualcomm Incorporated
    Inventor: Saihua Lin
  • Patent number: 9356560
    Abstract: A method and apparatus are disclosed for transmitting communication signals through a multi-mode power amplifier. For at least some embodiments, a communication signal may be amplified by an amplifier of the multi-mode power amplifier selected based on a desired transmit output power. The output of the selected amplifier may be coupled through a configurable inductive element to an antenna. The inductive element may be configured as a balun or as an inductive load element based on an operating mode of the multi-mode power amplifier.
    Type: Grant
    Filed: August 1, 2014
    Date of Patent: May 31, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Saihua Lin, Alan Ngar Loong Chan
  • Publication number: 20160072456
    Abstract: An apparatus includes amplification circuitry configured to amplify a radio frequency (RF) signal. The apparatus also includes differential inductors coupled to an output of the amplification circuitry. The differential inductors include a first inductor serially coupled to a second inductor, and the differential inductors are configured to filter the RF signal and to provide a differential output.
    Type: Application
    Filed: September 9, 2014
    Publication date: March 10, 2016
    Inventors: Saihua Lin, Anup Savla, Mounir Youssef Bohsali
  • Publication number: 20160072455
    Abstract: An apparatus includes a first path tuned to a first frequency band and a second path tuned to a second frequency band. The apparatus also includes cross-coupled circuitry having a first input coupled to the first path and a second input coupled to the second path and having a first output coupled to the second path and a second output coupled to the first path.
    Type: Application
    Filed: September 5, 2014
    Publication date: March 10, 2016
    Inventor: Saihua Lin