Patents by Inventor Chang-Yuan Liou

Chang-Yuan Liou 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).

  • Programmable band-pass filter circuit of analog front-end used for capacitance detection
    Patent number: 10063214
    Abstract: A programmable band-pass filter circuit, which is included by an analog front-end circuit and used for capacitance detection, includes an operational amplifier, an input resistor, a feedback resistor, and a feedback capacitor. The operational amplifier includes a first input coupled to a reference level, a second input, and an output. The input resistor has a first end coupled to a sensed capacitor and a second end coupled to the second input of the operational amplifier. The feedback resistor and feedback capacitor are connected between the second input of the operational amplifier and the output of the operational amplifier, respectively.
    Type: Grant
    Filed: November 10, 2016
    Date of Patent: August 28, 2018
    Assignee: PixArt Imaging Inc.
    Inventors: Sung-Han Wu, Chang-Yuan Liou
  • PROGRAMMABLE BAND-PASS FILTER CIRCUIT OF ANALOG FRONT-END USED FOR CAPACITANCE DETECTION
    Publication number: 20170063340
    Abstract: A programmable band-pass filter circuit, which is included by an analog front-end circuit and used for capacitance detection, includes an operational amplifier, an input resistor, a feedback resistor, and a feedback capacitor. The operational amplifier includes a first input coupled to a reference level, a second input, and an output. The input resistor has a first end coupled to a sensed capacitor and a second end coupled to the second input of the operational amplifier. The feedback resistor and feedback capacitor are connected between the second input of the operational amplifier and the output of the operational amplifier, respectively.
    Type: Application
    Filed: November 10, 2016
    Publication date: March 2, 2017
    Inventors: Sung-Han Wu, Chang-Yuan Liou