Patents by Inventor Yuan-Shuo Chang

Yuan-Shuo Chang 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: 20190173694
    Abstract: A signal transmitter device includes a transmitter and a detection circuit. The transmitter is configured to transmit an output signal based on a first baseband signal and a second baseband signal, in which the first baseband signal and the second baseband signal have a baseband frequency. The detection circuit is configured to perform twice signal modulations according to the output signal to detect a signal component, which has the baseband frequency, of the output signal, in order to control a compensation circuit to correct a channel mismatch of the transmitter.
    Type: Application
    Filed: August 14, 2018
    Publication date: June 6, 2019
    Inventor: Yuan-Shuo Chang
  • Patent number: 10305523
    Abstract: A transmitting device, for handling signal interference, comprises a first transmitting circuit, for processing a first plurality of baseband signals, to generate a first plurality of radio frequency signals; a second transmitting circuit, for processing a second plurality of baseband signals and a plurality of input signals, to generate a second plurality of radio frequency signals; a feedback circuit, coupled to the second transmitting circuit, for processing the second plurality of radio frequency signals and a plurality of leakage signals, to generate a plurality of error signals; and a control circuit, coupled to the first transmitting circuit, the second transmitting circuit and the feedback circuit, for generating the plurality of input signals according to the first plurality of baseband signals and the plurality of error signals.
    Type: Grant
    Filed: September 3, 2018
    Date of Patent: May 28, 2019
    Assignee: Realtek Semiconductor Corp.
    Inventors: Chin-Liang Wang, Min-Chau Jan, Wen-Shan Wang, Yuan-Shuo Chang, Wu-Chi Wang, Ying-Hsi Lin
  • Patent number: 10230478
    Abstract: The invention relates to a system for interference cancellation and method thereof. The system includes a receiver, a transmitter, and a channel estimating and equalizing device. The transmitter and the receiver use different wireless communication technologies to transmit and receive data. The channel estimating and equalizing device can estimate the channel between the transmitter and the receiver for interference cancellation. The embodiments of the invention provide a system and a method thereof for reducing interferences generated when using one wireless communication technology to transmit signals but using another wireless communication technology to receive signals by using digital baseband signals.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: March 12, 2019
    Assignee: REALTEK SEMICONDUCTOR CORP.
    Inventors: Wu-Chi Wang, Yuan-Shuo Chang
  • Publication number: 20190074855
    Abstract: A transmitting device, for handling signal interference, comprises a first transmitting circuit, for processing a first plurality of baseband signals, to generate a first plurality of radio frequency signals; a second transmitting circuit, for processing a second plurality of baseband signals and a plurality of input signals, to generate a second plurality of radio frequency signals; a feedback circuit, coupled to the second transmitting circuit, for processing the second plurality of radio frequency signals and a plurality of leakage signals, to generate a plurality of error signals; and a control circuit, coupled to the first transmitting circuit, the second transmitting circuit and the feedback circuit, for generating the plurality of input signals according to the first plurality of baseband signals and the plurality of error signals.
    Type: Application
    Filed: September 3, 2018
    Publication date: March 7, 2019
    Inventors: Chin-Liang Wang, Min-Chau Jan, Wen-Shan Wang, Yuan-Shuo Chang, Wu-Chi Wang, Ying-Hsi Lin
  • Patent number: 10211931
    Abstract: A method of interference cancellation includes the following steps: performing a take-energy operation on a to-be-sent signal at multiple times to generate multiple to-be-sent signal powers; performing a first high-pass operation on the to-be-sent signal powers to generate a to-be-sent high-pass result; performing a second high-pass operation on a received signal to generate a received high-pass result; adjusting multiple filter coefficients according to the to-be-sent high-pass result and the received high-pass result; and generating a recover signal according to the filter coefficients.
    Type: Grant
    Filed: July 18, 2018
    Date of Patent: February 19, 2019
    Assignee: Realtek Semiconductor Corp.
    Inventors: Chin-Liang Wang, Kuan-Kai Chen, Min-Chau Jan, Wen-Shan Wang, Yuan-Shuo Chang, Ying-Hsi Lin
  • Patent number: 10027357
    Abstract: A transmitter with compensating mechanism of pulling effect includes a correction unit and an output unit. The correction unit includes a memory circuit and a first address generation circuit. The memory circuit is configured to store a look up table, wherein the look up table stores correction data corresponding to an in-phase data signal, a quadrature data signal, and at least one system parameter. The first address generation circuit is configured to generate a first address according to the in-phase data signal, the quadrature data signal, and the at least one system parameter, in order to output a correction signal via the correction data. The output unit is configured to modulate the correction signal according to an oscillating signal to generate a modulated signal, and amplify the modulated signal to generate an output signal.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: July 17, 2018
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventor: Yuan-Shuo Chang
  • Patent number: 9900019
    Abstract: A calibration circuit for a time-interleaved analog-to-digital converter includes a filter circuit and a calculating circuit. The filter circuit is configured to receive a first signal and generate a second signal based on the first signal. The first signal comprises an image of an interference signal, the second signal comprises a reconstructed image of the interference signal, and a frequency of the reconstructed image of the interference signal is the same as a frequency of the image of the interference signal. The calculating circuit is configured to cancel the image of the interference signal of the first signal according to the second signal.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: February 20, 2018
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventor: Yuan-Shuo Chang
  • Publication number: 20170373764
    Abstract: The invention relates to a system for interference cancellation and method thereof. The system includes a receiver, a transmitter, and a channel estimating and equalizing device. The transmitter and the receiver use different wireless communication technologies to transmit and receive data. The channel estimating and equalizing device can estimate the channel between the transmitter and the receiver for interference cancellation. The embodiments of the invention provide a system and a method thereof for reducing interferences generated when using one wireless communication technology to transmit signals but using another wireless communication technology to receive signals by using digital baseband signals.
    Type: Application
    Filed: March 22, 2017
    Publication date: December 28, 2017
    Inventors: WU-CHI WANG, YUAN-SHUO CHANG
  • Patent number: 9749172
    Abstract: A method for calibrating mismatches of an in-phase signal path and a quadrature signal path of a receiver is proposed in the present invention, including: utilizing the receiver to receive at least one test signal with a specific frequency via the first signal path and the second signal path, to generate a first signal path received signal and a second signal path received signal; performing frequency analysis upon the first signal path received signal and the second signal path received signal respectively, to generate a first frequency analysis result and a second frequency analysis result; and calculating at least one calibration coefficient according to the first frequency analysis result and the second frequency analysis result. A method for calibrating mismatches of an in-phase signal path and a quadrature signal path of a transmitter is also proposed in the present invention.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: August 29, 2017
    Assignee: Realtek Semiconductor Corp.
    Inventors: Yuan-Shuo Chang, Ching-Chia Cheng
  • Publication number: 20170194991
    Abstract: A transmitter with compensating mechanism of pulling effect includes a correction unit and an output unit. The correction unit includes a memory circuit and a first address generation circuit. The memory circuit is configured to store a look up table, wherein the look up table stores correction data corresponding to an in-phase data signal, a quadrature data signal, and at least one system parameter. The first address generation circuit is configured to generate a first address according to the in-phase data signal, the quadrature data signal, and the at least one system parameter, in order to output a correction signal via the correction data. The output unit is configured to modulate the correction signal according to an oscillating signal to generate a modulated signal, and amplify the modulated signal to generate an output signal.
    Type: Application
    Filed: December 28, 2016
    Publication date: July 6, 2017
    Inventor: Yuan-Shuo CHANG
  • Publication number: 20170194990
    Abstract: A transmitter with compensating mechanism of pulling effect includes an output unit and a correction unit. The output unit mixes a first correction signal and a second correction signal according to an oscillating signal to generate a modulated signal, and to amplify the modulated signal to generate a first output signal. The correction unit analyzes the power of the first output signal to generate a first coefficient and a second coefficient, and generate the first correction signal and the second correction signal according to the first coefficient, the second coefficient, an in-phase data signal, and a quadrature data signal.
    Type: Application
    Filed: December 26, 2016
    Publication date: July 6, 2017
    Inventors: Wen-Shan WANG, Yuan-Shuo CHANG, Chih-Chieh WANG
  • Patent number: 9450544
    Abstract: A pre-distortion method includes: receiving an input data; and obtaining a pre-distortion output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a following power amplifier; and multiplying a reciprocal of a pre-distortion ratio of the output of the power amplifier to the input data by the output of the power amplifier. A pre-distortion apparatus includes a receiver, a pre-distortion unit and a gain compensating unit. The receiver is utilized for receiving an input data. The pre-distortion unit is utilized for obtaining a pre-distortion output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a following power amplifier. The gain compensating unit is utilized for multiplying a reciprocal of a pre-distortion ratio of the output of the power amplifier to the input data by the output of the power amplifier.
    Type: Grant
    Filed: August 12, 2014
    Date of Patent: September 20, 2016
    Assignee: Realtek Semiconductor Corp.
    Inventor: Yuan-Shuo Chang
  • Patent number: 9438177
    Abstract: A pre-distortion method includes: receiving an input data; and obtaining a pre-distorted output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a power amplifier. A pre-distortion apparatus includes a receiver and a pre-distortion unit. The receiver is utilized for receiving an input data. The pre-distortion unit is utilized for obtaining a pre-distorted output by inputting the input data into a pre-distortion function, wherein the pre-distortion function is determined according to a following power amplifier. A non-transitory machine readable medium stores a program code executed for performing steps of the proposed pre-distortion method.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: September 6, 2016
    Assignee: Realtek Semiconductor Corp.
    Inventor: Yuan-Shuo Chang
  • Patent number: 9331652
    Abstract: An auto gain adjusting device and method is disclosed. The auto gain adjusting device comprises a predistorter, a gain unit, a power amplifier, a receiving unit and a calculation unit. The predistorter generates a plurality of test signals in a calibration mode, wherein the powers between a current test signal and a previous test signal includes a first difference value. The gain unit provides a substantially constant gain value to the current test signal and the previous test signal to generate a current amplified test signal and a previous amplified test signal. The power amplifier amplifies the current amplified test signal and the previous amplified test signal to generate a first transmitting signal and a second transmitting signal. The receiving unit converts the first transmitting signal and the second transmitting signal into a first baseband signal and a second baseband signal respectively.
    Type: Grant
    Filed: April 8, 2014
    Date of Patent: May 3, 2016
    Assignee: REALTEK SEMICONDUCTOR CORP.
    Inventor: Yuan-Shuo Chang
  • Patent number: 9215014
    Abstract: A method for determining a default gain of a wireless transmission system is provided. The wireless transmission system includes a signal transmission path and a signal feedback path coupled to the signal transmission path. The signal transmission path includes a power amplification circuit and a gain stage having a plurality of transmission gains. The method includes the following step: setting a gain of the gain stage as a specific transmission gain of the transmission gains; transmitting a plurality of test signals through the signal transmission path in sequence to generate a plurality of amplified test signals, wherein at least a portion of powers of the test signals correspond to the transmission gains, respectively; receiving the amplified test signals through the signal feedback path in sequence, and accordingly obtaining corresponding signal gains; and determining a default gain of the gain stage according to the signal gains.
    Type: Grant
    Filed: April 15, 2014
    Date of Patent: December 15, 2015
    Assignee: Realtek Semiconductor Corp.
    Inventors: Yuan-Shuo Chang, Chien-Yu Chen
  • Publication number: 20150350000
    Abstract: A method for calibrating mismatches of an in-phase signal path and a quadrature signal path of a receiver is proposed in the present invention, including: utilizing the receiver to receive at least one test signal with a specific frequency via the first signal path and the second signal path, to generate a first signal path received signal and a second signal path received signal; performing frequency analysis upon the first signal path received signal and the second signal path received signal respectively, to generate a first frequency analysis result and a second frequency analysis result; and calculating at least one calibration coefficient according to the first frequency analysis result and the second frequency analysis result. A method for calibrating mismatches of an in-phase signal path and a quadrature signal path of a transmitter is also proposed in the present invention.
    Type: Application
    Filed: May 28, 2015
    Publication date: December 3, 2015
    Inventors: Yuan-Shuo Chang, Ching-Chia Cheng
  • Publication number: 20150155955
    Abstract: A method for calibrating mismatches of an in-phase signal path and a quadrature signal path of a transmitter, including: additionally configuration at least one mixer calibration coefficient at a transmitting part of the transmitter; obtaining at least one mixer testing signal from the transmitting part via loopback for spectrum analysis to derive at least one mixer spectrum analysis result; adjusting the mixer calibration coefficient of the transmitting part according to the mixer spectrum analysis result; and additionally utilizing an in-phase signal path finite impulse response filter and a quadrature signal path finite impulse response filter to calibrate mismatches between a low pass filter of the in-phase signal path of the transmitting part of the transmitter and a low pass filter of the quadrature signal path of the transmitting part of the transmitter. A similar mismatch calibration operation may be applied to a receiver.
    Type: Application
    Filed: November 17, 2014
    Publication date: June 4, 2015
    Inventors: Yuan-Shuo Chang, Ching-Chia Cheng
  • Patent number: 9036733
    Abstract: Multiplier coefficients are updated according to minimal power value of mixed signals in a wireless communication system. While using updated multiplier parameters, signal imbalance caused by a local oscillator or mismatch between analog elements of the wireless communication system can be reduced, so that the wireless communication system can be immune from noises.
    Type: Grant
    Filed: July 10, 2013
    Date of Patent: May 19, 2015
    Assignee: Realtek Semiconductor Corp.
    Inventor: Yuan-Shuo Chang
  • Patent number: 9036753
    Abstract: A method for calibrating mismatches of an in-phase signal path and a quadrature signal path of a transmitter, including: additionally configuration at least one mixer calibration coefficient at a transmitting part of the transmitter; obtaining at least one mixer testing signal from the transmitting part via loopback for spectrum analysis to derive at least one mixer spectrum analysis result; adjusting the mixer calibration coefficient of the transmitting part according to the mixer spectrum analysis result; and additionally utilizing an in-phase signal path finite impulse response filter and a quadrature signal path finite impulse response filter to calibrate mismatches between a low pass filter of the in-phase signal path of the transmitting part of the transmitter and a low pass filter of the quadrature signal path of the transmitting part of the transmitter. A similar mismatch calibration operation may be applied to a receiver.
    Type: Grant
    Filed: November 17, 2014
    Date of Patent: May 19, 2015
    Assignee: Realtek Semiconductor Corp.
    Inventors: Yuan-Shuo Chang, Ching-Chia Cheng
  • Patent number: 9008161
    Abstract: A method for calibrating mismatches of an in-phase signal path and a quadrature signal path of a transmitter, including: additionally configuration at least one mixer calibration coefficient at a transmitting part of the transmitter; obtaining at least one mixer testing signal from the transmitting part via loopback for spectrum analysis to derive at least one mixer spectrum analysis result; adjusting the mixer calibration coefficient of the transmitting part according to the mixer spectrum analysis result; and additionally utilizing an in-phase signal path finite impulse response filter and a quadrature signal path finite impulse response filter to calibrate mismatches between a low pass filter of the in-phase signal path of the transmitting part of the transmitter and a low pass filter of the quadrature signal path of the transmitting part of the transmitter. A similar mismatch calibration operation may be applied to a receiver.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: April 14, 2015
    Assignee: Realtek Semiconductor Corp.
    Inventors: Yuan-Shuo Chang, Ching-Chia Cheng