Patents by Inventor Cheng-Hsien Li

Cheng-Hsien Li 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: 11916314
    Abstract: A mobile device includes a housing, a first radiation element, a second radiation element, a third radiation element, a first switch element, and a second switch element. The first radiation element has a first feeding point. The second radiation element has a second feeding point. The first radiation element, the second radiation element, and the third radiation element are distributed over the housing. The first switch element is closed or open, so as to selectively couple the first radiation element to the third radiation element. The second switch element is closed or open, so as to selectively couple the second radiation element to the third radiation element. An antenna structure is formed by the first radiation element, the second radiation element, and the third radiation element.
    Type: Grant
    Filed: May 12, 2022
    Date of Patent: February 27, 2024
    Assignee: HTC Corporation
    Inventors: Cheng-Hung Lin, Szu-Po Wang, Chia-Te Chien, Chun-Chieh Wang, Kang-Ling Li, Chun-Hsien Lee, Yu-Chieh Chiu
  • Patent number: 11711111
    Abstract: The present invention discloses a signal transceiving apparatus having echo-canceling mechanism. A mixer circuit includes a Wheatstone bridge and a transformer winding circuit. The Wheatstone bridge includes another transformer winding circuit and a variable load and includes a first input terminal, a first output terminal, a second input terminal and a second output terminal located at each two neighboring arms in an order. A transmission circuit is coupled to the first input terminal and the second input terminal to perform signal transmission through the mixer circuit. A receiving circuit is coupled to the first output terminal and the second output terminal to perform signal receiving through the mixer circuit. A control circuit adjusts the impedance of the variable load when a residual echo noise amount does not satisfy a minimum echo noise amount condition, and stops to adjust the impedance when the residual echo noise amount satisfies the condition.
    Type: Grant
    Filed: June 25, 2021
    Date of Patent: July 25, 2023
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventor: Cheng-Hsien Li
  • Publication number: 20230188102
    Abstract: An amplifier circuit includes a continuous-time linear equalizer, an adjustable gain circuit and a filter circuit. The continuous-time linear equalizer includes a first high-pass path, a first low-pass path, a second high-pass path, and a second low-pass path. The first high-pass path is used to increase a gain of a high-frequency part of a first signal source, and the second high-pass path is used to increase a gain of a high-frequency part of a second signal source. The filter circuit is used to amplify and filter the first signal source and the second signal source, and includes a fully-differential operational amplifier, a first filter network, and a second filter network.
    Type: Application
    Filed: December 14, 2022
    Publication date: June 15, 2023
    Inventors: CHIA-WEI YU, YUNG-TAI CHEN, TSUNG-EN WU, CHENG-HSIEN LI, SHENG-YANG HO
  • Patent number: 11558126
    Abstract: An echo estimation system includes a transceiver circuitry and a processor circuitry. The processor circuitry is coupled to the transceiver circuitry. The processor circuitry is configured to calculate linear echo power and non-linear echo power based on a signal under test in the transceiver circuitry. The linear echo power and the non-linear echo power are utilized to determine a quality of the transceiver circuitry or utilized to determine component parameters of the transceiver circuitry.
    Type: Grant
    Filed: May 28, 2021
    Date of Patent: January 17, 2023
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Bo-Rong Huang, Cheng-Hsien Li, Tsung-En Wu, Yu-Tung Liao
  • Publication number: 20220200657
    Abstract: The present invention discloses a signal transceiving apparatus having echo-canceling mechanism. A mixer circuit includes a Wheatstone bridge and a transformer winding circuit. The Wheatstone bridge includes another transformer winding circuit and a variable load and includes a first input terminal, a first output terminal, a second input terminal and a second output terminal located at each two neighboring arms in an order. A transmission circuit is coupled to the first input terminal and the second input terminal to perform signal transmission through the mixer circuit. A receiving circuit is coupled to the first output terminal and the second output terminal to perform signal receiving through the mixer circuit. A control circuit adjusts the impedance of the variable load when a residual echo noise amount does not satisfy a minimum echo noise amount condition, and stops to adjust the impedance when the residual echo noise amount satisfies the condition.
    Type: Application
    Filed: June 25, 2021
    Publication date: June 23, 2022
    Inventor: CHENG-HSIEN LI
  • Publication number: 20220014281
    Abstract: An echo estimation system includes a transceiver circuitry and a processor circuitry. The processor circuitry is coupled to the transceiver circuitry. The processor circuitry is configured to calculate linear echo power and non-linear echo power based on a signal under test in the transceiver circuitry. The linear echo power and the non-linear echo power are utilized to determine a quality of the transceiver circuitry or utilized to determine component parameters of the transceiver circuitry.
    Type: Application
    Filed: May 28, 2021
    Publication date: January 13, 2022
    Inventors: Bo-Rong HUANG, Cheng-Hsien LI, Tsung-En WU, Yu-Tung LIAO
  • Patent number: 11206159
    Abstract: The present disclosure discloses a signal equalization apparatus. A channel length estimation circuit determines a transmission channel length of the input signal such that a processing circuit retrieves predetermined feed-forward equalizer coefficients. A feed-forward equalizer equalizes the input signal according to operation feed-forward equalizer coefficients. An auto gain circuit amplifies the input signal according to an offset signal. A signal adding circuit adds the amplified input signal and a feedback adjusting signal to generate an added input signal. A data slicer generates a data-slicing result and the offset signal according to reference thresholds based on the added input signal. A feedback equalizer equalizes the data-slicing result to generate the feedback adjusting signal according to operation feedback equalizer coefficients.
    Type: Grant
    Filed: November 4, 2020
    Date of Patent: December 21, 2021
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Tsung-En Wu, Cheng-Hsien Li
  • Publication number: 20210144030
    Abstract: The present disclosure discloses a signal equalization apparatus. A channel length estimation circuit determines a transmission channel length of the input signal such that a processing circuit retrieves predetermined feed-forward equalizer coefficients. A feed-forward equalizer equalizes the input signal according to operation feed-forward equalizer coefficients. An auto gain circuit amplifies the input signal according to an offset signal. A signal adding circuit adds the amplified input signal and a feedback adjusting signal to generate an added input signal. A data slicer generates a data-slicing result and the offset signal according to reference thresholds based on the added input signal. A feedback equalizer equalizes the data-slicing result to generate the feedback adjusting signal according to operation feedback equalizer coefficients.
    Type: Application
    Filed: November 4, 2020
    Publication date: May 13, 2021
    Inventors: TSUNG-EN WU, CHENG-HSIEN LI
  • Patent number: 10297718
    Abstract: A light-emitting device includes a substrate including an upper surface; a light-emitting stack including a first semiconductor layer, a second semiconductor layer, and an active layer between the first semiconductor layer and the second semiconductor layer, wherein the light-emitting stack includes a first surface and a second surface opposite to the first surface toward to the upper surface; a plurality of depressions formed in the light-emitting stack and penetrating the second semiconductor layer, the active layer and a portion of the first semiconductor layer; an insulative layer covering the second surface of the light-emitting stack; a connector including a first portion and a second portion; and an electrode disposed at a side of the light-emitting stack and electrically connecting the connector, wherein the first portion of the connector is formed in the plurality of depressions, the second portion of the connector is between the insulative layer and the light-emitting stack.
    Type: Grant
    Filed: October 14, 2016
    Date of Patent: May 21, 2019
    Assignee: EPISTAR CORPORATION
    Inventors: Wei-Jung Chung, Jennhwa Fu, Cheng-Hsien Li, Chi-Hao Huang
  • Publication number: 20170033265
    Abstract: A light-emitting device includes a substrate including an upper surface; a light-emitting stack including a first semiconductor layer, a second semiconductor layer, and an active layer between the first semiconductor layer and the second semiconductor layer, wherein the light-emitting stack includes a first surface and a second surface opposite to the first surface toward to the upper surface; a plurality of depressions formed in the light-emitting stack and penetrating the second semiconductor layer, the active layer and a portion of the first semiconductor layer; an insulative layer covering the second surface of the light-emitting stack; a connector including a first portion and a second portion; and an electrode disposed at a side of the light-emitting stack and electrically connecting the connector, wherein the first portion of the connector is formed in the plurality of depressions, the second portion of the connector is between the insulative layer and the light-emitting stack.
    Type: Application
    Filed: October 14, 2016
    Publication date: February 2, 2017
    Inventors: Wei-Jung CHUNG, Jennhwa FU, Cheng-Hsien LI, Chi-Hao HUANG
  • Patent number: 9312912
    Abstract: This invention discloses a signal transmitting and receiving circuit of a digital subscriber line used for transmitting an output signal to a telecommunication loop or receiving an input signal from the telecommunication loop. The signal transmitting and receiving circuit comprises a transformer, which is coupled to the telecommunication loop; a signal transmitting module, which is coupled to the transformer, for generating the output signal; a signal receiving module, which is coupled to the transformer, for processing the input signal; an echo cancelling circuit, comprising passive components and having two ends, one of which is coupled to the signal transmitting module and the transformer, the other is coupled to the signal receiving module and the transformer. The output signal is transmitted to the telecommunication loop via the electromagnetic coupling of the transformer, and the input signal is received by the signal receiving module by the electromagnetic coupling of the transformer.
    Type: Grant
    Filed: June 26, 2014
    Date of Patent: April 12, 2016
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventors: Yung-Tai Chen, Cheng-Hsien Li, Hung-Chen Chu, Jian-Ru Lin
  • Publication number: 20150311400
    Abstract: A light-emitting device comprises: a conductive substrate; a conductive structure formed on the substrate, defining a first region and a second region laterally adjacent to the first region; a light-emitting structure formed on the first region; and a dielectric structure comprising a first dielectric layer and a second dielectric layer within the second region.
    Type: Application
    Filed: July 7, 2015
    Publication date: October 29, 2015
    Inventors: Cheng-Hsien LI, Chi-Hao HUANG, Hsin-Hsiung HUANG
  • Patent number: 9083427
    Abstract: The present invention discloses a transceiver of digital subscriber line (DSL) which supports a variety of DSL systems, comprising: a transmission circuit for receiving an output signal and generating a first DSL transmission signal or a second DSL transmission signal according to the output signal under the control of a transmission selection parameter; a hybrid circuit for generating a line transmission signal according to the first or second DSL transmission signal and generating a DSL reception signal according to a line reception signal; and a reception circuit for generating a first DSL reception signal or a second DSL reception signal according to the DSL reception signal, and then outputting one of the first and second DSL reception signals as an input signal according to a reception selection parameter.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: July 14, 2015
    Assignee: REALTEK SEMICONDUCTOR CORPORATION
    Inventor: Cheng-Hsien Li
  • Patent number: 9076923
    Abstract: A method for manufacturing a light-emitting device comprising the steps of: providing a first substrate, a chip area, and a street area; forming a light-emitting structure on the first substrate; forming a conductive structure between the first substrate and the light-emitting structure; removing a part of the light-emitting structure in the street area to expose a sidewall of the light-emitting structure in the chip area; forming a first passivation layer on the light-emitting structure in the chip area; forming a second passivation layer on the conductive structure in the street area, on the sidewalls of the light-emitting structure, and on the sidewalls of the first passivation layer; forming a through-hole in the first passivation layer, and forming an electrode in the through-hole.
    Type: Grant
    Filed: February 13, 2012
    Date of Patent: July 7, 2015
    Assignee: EPISTAR CORPORATION
    Inventors: Cheng-Hsien Li, Chi-Hao Huang, Hsin-Hsiung Huang
  • Patent number: 9012942
    Abstract: The present disclosure provides a light-emitting device having a patterned interface composed of a plurality of predetermined patterned structures mutually distinct, wherein the plurality of predetermined patterned structures are repeatedly arranged in the patterned interface such that any two neighboring patterned structures are different from each other. The present disclosure also provides a manufacturing method of the light-emitting device. The method comprises the steps of providing a substrate, generating a random pattern arrangement by a computing simulation, forming a mask having the random pattern arrangement on the substrate, and removing a portion of the substrate thereby transferring the random pattern arrangement to the substrate.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: April 21, 2015
    Assignee: Epistar Corporation
    Inventors: Jenn-Hwa Fu, Cheng-Hsien Li, Chi-Hao Huang
  • Publication number: 20150103986
    Abstract: This invention discloses a signal transmitting and receiving circuit of a digital subscriber line used for transmitting an output signal to a telecommunication loop or receiving an input signal from the telecommunication loop. The signal transmitting and receiving circuit comprises a transformer, which is coupled to the telecommunication loop; a signal transmitting module, which is coupled to the transformer, for generating the output signal; a signal receiving module, which is coupled to the transformer, for processing the input signal; an echo cancelling circuit, comprising passive components and having two ends, one of which is coupled to the signal transmitting module and the transformer, the other is coupled to the signal receiving module and the transformer. The output signal is transmitted to the telecommunication loop via the electromagnetic coupling of the transformer, and the input signal is received by the signal receiving module by the electromagnetic coupling of the transformer.
    Type: Application
    Filed: June 26, 2014
    Publication date: April 16, 2015
    Inventors: YUNG-TAI CHEN, CHENG-HSIEN LI, HUNG-CHEN CHU, JIAN-RU LIN
  • Publication number: 20140374779
    Abstract: A light-emitting device includes a light-emitting stack including a first semiconductor layer, a second semiconductor layer, and an active layer between the first semiconductor layer and the second semiconductor layer, wherein the first semiconductor layer includes a first surface, a second surface opposite to the first surface, a first portion connecting to the first surface, and a second portion connecting to the first portion; an opening penetrating the first portion from the first surface and having a first width; a depression connecting to the opening and penetrating the second semiconductor layer, the active layer, and the second portion of the first semiconductor layer, wherein the depression includes a second width greater than the first width, and the depression includes a bottom to expose the second surface, and an electrode located in the depression and corresponding to the opening.
    Type: Application
    Filed: June 11, 2014
    Publication date: December 25, 2014
    Inventors: Wei-Jung CHUNG, Jennhwa FU, Cheng-Hsien LI, Chi-Hao HUANG
  • Patent number: 8861687
    Abstract: An integrated hybrid circuit includes a transmission unit, a transceiver coil, a transceiver circuit, a hybrid matching circuit, and a receiving circuit. The transmission unit generates a pair of upstream signals according to a user transmission signal. The transceiver coil transmits the pair of upstream signals to a central office through a pair of twisted pair, and receiving a pair of downstream signals from the central office through the pair of twisted pair. The hybrid matching circuit receives an adjustment signal to adjust selective impedances. The receiving circuit receives the pair of downstream signals from the central office, and generates the adjustment signal according to downstream and upstream rates and signals from the hybrid matching circuit. The transmission unit adjusts transmission power and bandwidth of the transmission unit and the receiving unit adjusts filter bandwidth of the receiving unit according to the adjustment signal for optimizing upstream and downstream rates.
    Type: Grant
    Filed: July 8, 2013
    Date of Patent: October 14, 2014
    Assignee: Realtek Semiconductor Corp.
    Inventors: Cheng-Hsien Li, Wen-Chieh Lai, Chih-Chiang Liao
  • Publication number: 20140241405
    Abstract: The present invention discloses a transceiver of digital subscriber line (DSL) which supports a variety of DSL systems, comprising: a transmission circuit for receiving an output signal and generating a first DSL transmission signal or a second DSL transmission signal according to the output signal under the control of a transmission selection parameter; a hybrid circuit for generating a line transmission signal according to the first or second DSL transmission signal and generating a DSL reception signal according to a line reception signal; and a reception circuit for generating a first DSL reception signal or a second DSL reception signal according to the DSL reception signal, and then outputting one of the first and second DSL reception signals as an input signal according to a reception selection parameter.
    Type: Application
    Filed: February 25, 2014
    Publication date: August 28, 2014
    Applicant: REALTEK SEMICONDUCTOR CORPORATION
    Inventor: CHENG-HSIEN LI
  • Publication number: 20140010356
    Abstract: An integrated hybrid circuit includes a transmission unit, a transceiver coil, a transceiver circuit, a hybrid matching circuit, and a receiving circuit. The transmission unit generates a pair of upstream signals according to a user transmission signal. The transceiver coil transmits the pair of upstream signals to a central office through a pair of twisted pair, and receiving a pair of downstream signals from the central office through the pair of twisted pair. The hybrid matching circuit receives an adjustment signal to adjust selective impedances. The receiving circuit receives the pair of downstream signals from the central office, and generates the adjustment signal according to downstream and upstream rates and signals from the hybrid matching circuit. The transmission unit adjusts transmission power and bandwidth of the transmission unit and the receiving unit adjusts filter bandwidth of the receiving unit according to the adjustment signal for optimizing upstream and downstream rates.
    Type: Application
    Filed: July 8, 2013
    Publication date: January 9, 2014
    Inventors: Cheng-Hsien Li, Wen-Chieh Lai, Chih-Chiang Liao