Patents by Inventor Sheng-Hong Yan

Sheng-Hong Yan 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: 10483925
    Abstract: A circuit module includes a power amplifier, a switch, and a bypass capacitor. The power amplifier has a signal input node coupled to an input signal, a signal output node to generate an output signal, and a power input node coupled to a supply output signal of a supply modulator. The switch is coupled between the power input node of the power amplifier and the bypass capacitor. The bypass capacitor is an equivalently removable bypass capacitor coupled between the switch and a ground level.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: November 19, 2019
    Assignee: MEDIATEK INC.
    Inventors: Sheng-Hong Yan, Da-Wei Sung, Chen-Yen Ho, Chia-Sheng Peng, Chien-Wei Kuan
  • Publication number: 20190334479
    Abstract: A package or a chip including a linear amplifier and a power amplifier is provided, wherein the linear amplifier is configured to receive an envelope tracking signal to generate an amplified envelope tracking signal, the power amplifier is supplied by an envelope tracking supply voltage comprising a DC supply voltage and the amplified envelope tracking signal, and the power amplifier is configured to receive an input signal to generate an output signal.
    Type: Application
    Filed: April 9, 2019
    Publication date: October 31, 2019
    Inventors: Chen-Yen Ho, Chien-Wei Kuan, Sheng-Hong Yan, Hsin-Hung Chen
  • Publication number: 20190052238
    Abstract: A circuit module includes a power amplifier, a switch, and a bypass capacitor. The power amplifier has a signal input node coupled to an input signal, a signal output node to generate an output signal, and a power input node coupled to a supply output signal of a supply modulator. The switch is coupled between the power input node of the power amplifier and the bypass capacitor. The bypass capacitor is an equivalently removable bypass capacitor coupled between the switch and a ground level.
    Type: Application
    Filed: August 3, 2018
    Publication date: February 14, 2019
    Inventors: Sheng-Hong Yan, Da-Wei Sung, Chen-Yen Ho, Chia-Sheng Peng, Chien-Wei Kuan
  • Patent number: 9998241
    Abstract: Apparatus and methods are provided to calibrate a closed-loop envelop tracking system for a power amplifier of a wireless transmitter using standardized modulation signals. In one novel aspect, a closed-loop adaptive method is used to track changes in PA nonlinearity due to environmental or circuitry changes during operating condition using standardized modulation signals. In one embodiment, the PA supply voltage compensation lookup table (LUT) and/or the phase compensation LUT is updated during normal operation to sustain good linearity and efficiency performance. In another novel aspect, the PA target response is adjusted in response to changes in PA-related system configuration, such as changes in PA bias settings, and/or indicators measured from the transmitter such as changes in impedance or temperature changes for the RF module or the PA module. The PA supply voltage compensation LUT and/or the phase LUT is updated accordingly upon adjustment of the PA target response.
    Type: Grant
    Filed: February 19, 2015
    Date of Patent: June 12, 2018
    Assignee: MEDIATEK INC.
    Inventors: Chiou-Wei Tsai, Chia-Sheng Peng, Sheng-Hong Yan
  • Patent number: 9912306
    Abstract: Provided is a power supply circuit for a wireless mobile device having a plurality of power amplification components. The power supply circuit includes: a first DC-DC converter, for providing at least one constant output voltage (which is provided to the power amplification components) and/or at least one DC intermediate voltage; a second DC-DC converter, for providing a DC component of at least one time-varying output voltage; and at least one linear amplifier. When the at least one linear amplifier receives the at least one DC intermediate voltage from the first DC-DC converter, the at least one linear amplifier provides at least one AC component of the at least one time-varying output voltage. The DC component and the at least one AC component of the at least one time-varying output voltage are combined into the at least one time-varying output voltage and provided to the power amplification components.
    Type: Grant
    Filed: April 20, 2017
    Date of Patent: March 6, 2018
    Assignee: MEDIATEK INC.
    Inventors: Shih-Mei Lin, Chien-Wei Kuan, Chen-Yen Ho, Che-Hao Meng, Tso-Min Chen, Chia-Sheng Peng, Sheng-Hong Yan
  • Publication number: 20180048272
    Abstract: Provided is a power supply circuit for a wireless mobile device having a plurality of power amplification components. The power supply circuit includes: a first DC-DC converter, for providing at least one constant output voltage (which is provided to the power amplification components) and/or at least one DC intermediate voltage; a second DC-DC converter, for providing a DC component of at least one time-varying output voltage; and at least one linear amplifier. When the at least one linear amplifier receives the at least one DC intermediate voltage from the first DC-DC converter, the at least one linear amplifier provides at least one AC component of the at least one time-varying output voltage. The DC component and the at least one AC component of the at least one time-varying output voltage are combined into the at least one time-varying output voltage and provided to the power amplification components.
    Type: Application
    Filed: April 20, 2017
    Publication date: February 15, 2018
    Inventors: Shih-Mei Lin, Chien-Wei Kuan, Chen-Yen Ho, Che-Hao Meng, Tso-Min Chen, Chia-Sheng Peng, Sheng-Hong Yan
  • Patent number: 9876517
    Abstract: A radio frequency (RF) receiver includes a digital tuning engine; and I-path and Q-path analog filters, tuned by the digital tuning engine. The digital tuning engine gets an I/Q imbalance difference, and the digital tuning engines tunes the I-path analog filter and/or the Q-path analog filter based on the I/O imbalance difference.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: January 23, 2018
    Assignee: MEDIATEK INC.
    Inventors: Sheng-Hong Yan, Sheng-Hao Chen, Paul Cheng Po Liang, Jen-Che Tsai
  • Patent number: 9800274
    Abstract: A communication unit comprises a decimator configured to sample a variable control signal and output a reduced bandwidth variable control signal; and a multi-level power supply, MLPS, comprising an input and an output, wherein the input is coupled to the decimator and configured to receive the reduced bandwidth variable control signal and, in response thereto, the output delivers multi-level output voltages to supply a power amplifier, PA, module.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: October 24, 2017
    Assignee: MediaTek, Inc.
    Inventors: Sheng-Hong Yan, Chia-Sheng Peng, Paul Cheng Po Liang
  • Patent number: 9680434
    Abstract: A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (RF) transmitter of a wireless communication unit is described. The method comprising, within at least one signal processing module of the wireless communication unit, applying a training signal comprising an envelope that varies with time to an input of the RF transmitter, receiving at least an indication of instantaneous output signal values for the power amplifier module in response to the training signal, calculating instantaneous gain values based at least partly on the received output power values, and adjusting a mapping function between an instantaneous envelope of a waveform signal to be amplified by the power amplifier module and the power amplifier module supply voltage to achieve a power amplifier module gain, for example that is monotonically increasing as a function of power amplifier output power.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: June 13, 2017
    Assignee: MediaTek, Inc.
    Inventors: Sheng-Hong Yan, Paul Cheng Po Liang
  • Publication number: 20170005676
    Abstract: A communication unit comprises a decimator configured to sample a variable control signal and output a reduced bandwidth variable control signal; and a multi-level power supply, MLPS, comprising an input and an output, wherein the input is coupled to the decimator and configured to receive the reduced bandwidth variable control signal and, in response thereto, the output delivers multi-level output voltages to supply a power amplifier, PA, module.
    Type: Application
    Filed: June 8, 2016
    Publication date: January 5, 2017
    Inventors: Sheng-Hong Yan, Chia-Sheng Peng, Paul Cheng Po Liang
  • Patent number: 9520907
    Abstract: A communication unit comprises a radio frequency, RF, transmitter comprising: a power amplifier, PA, module; an envelope tracking system operably coupled to the PA module and arranged to variably control a supply voltage for the PA module; and a load control system operably coupled to an output of the PA module and arranged to control a power amplifier output load.
    Type: Grant
    Filed: February 16, 2014
    Date of Patent: December 13, 2016
    Assignee: Mediatek Inc.
    Inventors: Chia-Sheng Peng, Wei-Cheng Liu, Sheng-Hong Yan, Paul Cheng Po Liang
  • Publication number: 20160249300
    Abstract: Apparatus and methods are provided to calibrate a closed-loop envelop tracking system for a power amplifier of a wireless transmitter using standardized modulation signals. In one novel aspect, a closed-loop adaptive method is used to track changes in PA nonlinearity due to environmental or circuitry changes during operating condition using standardized modulation signals. In one embodiment, the PA supply voltage compensation lookup table (LUT) and/or the phase compensation LUT is updated during normal operation to sustain good linearity and efficiency performance. In another novel aspect, the PA target response is adjusted in response to changes in PA-related system configuration, such as changes in PA bias settings, and/or indicators measured from the transmitter such as changes in impedance or temperature changes for the RF module or the PA module. The PA supply voltage compensation LUT and/or the phase LUT is updated accordingly upon adjustment of the PA target response.
    Type: Application
    Filed: February 19, 2015
    Publication date: August 25, 2016
    Inventors: Chiou-Wei Tsai, Chia-Sheng Peng, Sheng-Hong Yan
  • Patent number: 9288098
    Abstract: A communication unit has an envelope tracking system operably coupled to a power amplifier, PA, module. The envelope tracking system has at least one slew rate module arranged to re-distribute a slew rate across a number of input samples according to a maximum slew rate of the number of input samples; and a supply modulator arranged to variably control a supply voltage for the PA module in response to an output of the at least one slew rate module.
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: March 15, 2016
    Assignee: MediaTek, Inc.
    Inventors: Sheng-Hong Yan, Hao-Ping Hong
  • Publication number: 20150303957
    Abstract: A radio frequency (RF) receiver includes a digital tuning engine; and I-path and Q-path analog filters, tuned by the digital tuning engine. The digital tuning engine gets an I/Q imbalance difference, and the digital tuning engines tunes the I-path analog filter and/or the Q-path analog filter based on the I/Q imbalance difference.
    Type: Application
    Filed: June 30, 2015
    Publication date: October 22, 2015
    Inventors: Sheng-Hong Yan, Sheng-Hao Chen, Paul Cheng Po Liang, Jen-Che Tsai
  • Patent number: 9118535
    Abstract: A method of configuring at least one frequency dependent (FD), in-phase/quadrature (I/Q), imbalance compensation filter within a radio frequency (RF) module is described. The method includes applying an input signal to an input of the RF module, receiving a filtered I-path signal for the RF module and deriving at least one I-path filtering estimate value therefrom, receiving a filtered Q-path signal for the RF module and deriving at least one Q-path filtering estimate value therefrom, and configuring the at least one FD I/Q imbalance compensation filter based at least partly on at least one ratio between the derived I-path and Q-path filtering estimate values.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: August 25, 2015
    Assignee: MediaTek Singapore Pte. Ltd.
    Inventors: Balachander Narasimhan, Charles Chien, Sheng-Hong Yan, Paul Cheng Po Liang
  • Publication number: 20150236729
    Abstract: A communication unit comprises a radio frequency, RF, transmitter comprising: a power amplifier, PA, module; an envelope tracking system operably coupled to the PA module and arranged to variably control a supply voltage for the PA module; and a load control system operably coupled to an output of the PA module and arranged to control a power amplifier output load.
    Type: Application
    Filed: February 16, 2014
    Publication date: August 20, 2015
    Applicant: MEDIATEK INC.
    Inventors: Chia-Sheng Peng, Wei-Cheng Liu, Sheng-Hong Yan, Paul Cheng Po Liang
  • Publication number: 20150236877
    Abstract: A communication unit comprises a radio frequency, RF, transmitter comprising: a power amplifier, PA, module; an envelope tracking system operably coupled to the PA module and arranged to variably control a supply voltage for the PA module; and a load control system operably coupled to an output of the PA module and arranged to control a power amplifier output load.
    Type: Application
    Filed: February 14, 2014
    Publication date: August 20, 2015
    Applicant: MEDIATEK INC.
    Inventors: Chia-Sheng Peng, Wei-Cheng Liu, Sheng-Hong Yan, Paul Cheng Po Liang
  • Patent number: 9100078
    Abstract: A radio frequency (RF) receiver includes a digital tuning engine; I-path and Q-path analog filters, tuned by the digital tuning engine; and a digital compensation circuit. The digital tuning engine executes a RC (resistor-capacitor) time constant calibration to adjust respective cut-off frequencies of the I-path analog filter and the Q-path analog filter. The digital tuning engine executes a filter mismatch calibration to match the I-path analog filter and the Q-path analog filter. The digital tuning engine executes a filter residual mismatch calibration to match an I-path response from the I-path analog filter to the digital compensation circuit and a Q-path response from the Q-path analog filter to the digital compensation circuit.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: August 4, 2015
    Assignee: MEDIATEK INC.
    Inventors: Sheng-Hong Yan, Sheng-Hao Chen, Paul Cheng Po Liang, Jen-Che Tsai
  • Publication number: 20150194988
    Abstract: A communication unit includes a radio frequency, RF, transmitter having: a power amplifier, PA, module; and an envelope tracking system operably coupled to the PA module and having a supply modulator arranged to variably control a supply voltage for the PA module in response to a number of input samples of an envelope signal; wherein the envelope tracking system further includes at least one slew rate module arranged to re-distribute a maximum slew rate across the number of input samples in a provision of a variable power supply to the PA module.
    Type: Application
    Filed: January 9, 2014
    Publication date: July 9, 2015
    Applicant: MEDIATEK INC.
    Inventors: Sheng-Hong Yan, Hao-Ping Hong
  • Publication number: 20150195118
    Abstract: A communication unit has an envelope tracking system operably coupled to a power amplifier, PA, module. The envelope tracking system has at least one slew rate module arranged to re-distribute a slew rate across a number of input samples according to a maximum slew rate of the number of input samples; and a supply modulator arranged to variably control a supply voltage for the PA module in response to an output of the at least one slew rate module.
    Type: Application
    Filed: February 3, 2015
    Publication date: July 9, 2015
    Inventors: Sheng-Hong Yan, Hao-Ping Hong