Patents by Inventor Hsiang-Wei Hwang

Hsiang-Wei Hwang 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: 9877662
    Abstract: A vessel sensing device with automatic amendment function includes an analog processing circuit, a signal generating circuit and a DC voltage detecting circuit. The analog processing circuit includes an optical sensing module. An optical sensor of the optical sensing module generates an analog signal with a skin characteristic signal and a vessel characteristic signal according to an optical reflecting signal. The skin characteristic signal and the vessel characteristic signal respectively correspond to a skin feature and a vessel feature of the user. The signal generating circuit is coupled to the analog processing circuit to transform the analog signal into a compensation signal. The DC voltage detecting circuit is coupled to the signal generating circuit and adapted to compensate the analog processing circuit according to the compensation signal, so as to decrease the skin characteristic signal within the analog signal.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: January 30, 2018
    Assignee: PixArt Imaging Inc.
    Inventors: Peng-Sheng Chen, Hsiang-Wei Hwang, Jui-Te Chiu
  • Patent number: 9608575
    Abstract: A signal amplifying circuit with noise suppression function includes a first circuit module and a second circuit module. The first circuit module includes a current source and a switch. The current source is connected to an input stage for inputting a current. The switch is connected to a first output terminal and adapted to switch the input stage and the first output terminal according to a chopping frequency. The second circuit module includes an equivalent capacitance disposed between an output stage and a second input terminal connected to the first output terminal. The signal amplifying circuit controls current volume of the current source and capacity value of the equivalent capacitance to accordingly adjust an interior frequency bandwidth of the signal amplifying circuit, and the interior frequency bandwidth is smaller than the chopping frequency and greater than an input signal of the input stage.
    Type: Grant
    Filed: November 3, 2015
    Date of Patent: March 28, 2017
    Assignee: PixArt Imaging Inc.
    Inventors: Hsiang-Wei Hwang, Jui-Te Chiu
  • Publication number: 20170019073
    Abstract: A signal amplifying circuit with noise suppression function includes a first circuit module and a second circuit module. The first circuit module includes a current source and a switch. The current source is connected to an input stage for inputting a current. The switch is connected to a first output terminal and adapted to switch the input stage and the first output terminal according to a chopping frequency. The second circuit module includes an equivalent capacitance disposed between an output stage and a second input terminal connected to the first output terminal. The signal amplifying circuit controls current volume of the current source and capacity value of the equivalent capacitance to accordingly adjust an interior frequency bandwidth of the signal amplifying circuit, and the interior frequency bandwidth is smaller than the chopping frequency and greater than an input signal of the input stage.
    Type: Application
    Filed: November 3, 2015
    Publication date: January 19, 2017
    Inventors: Hsiang-Wei Hwang, Jui-Te Chiu
  • Patent number: 9425812
    Abstract: A circuit calibrating method, applied to an ACS generating circuit, which comprises a plurality of ACS generating units and activates the ACS generating unit corresponding to different DCCs to generate difference ACSs. The circuit calibrating method comprises: (a) determining which one of the ACSs has a large difference from an ideal value thereof; (b) adjusting a number of the ACS generating units, which are activated by a DCC corresponding to the ACS acquired in the step (a), or a next stage of the DCC corresponding to the ACS acquired in the step (a); and (c) generating the ACS to a target circuit, according to the number of the ACS generating circuits adjusted in the step (b).
    Type: Grant
    Filed: June 29, 2015
    Date of Patent: August 23, 2016
    Assignee: PixArt Imaging Inc.
    Inventors: Hsiang-Wei Hwang, Yung-Hung Chen, Han-Chi Liu
  • Publication number: 20160173116
    Abstract: A circuit calibrating method, applied to an ACS generating circuit, which comprises a plurality of ACS generating units and activates the ACS generating unit corresponding to different DCCs to generate difference ACSs. The circuit calibrating method comprises: (a) determining which one of the ACSs has a large difference from an ideal value thereof; (b) adjusting a number of the ACS generating units, which are activated by a DCC corresponding to the ACS acquired in the step (a), or a next stage of the DCC corresponding to the ACS acquired in the step (a); and (c) generating the ACS to a target circuit, according to the number of the ACS generating circuits adjusted in the step (b).
    Type: Application
    Filed: June 29, 2015
    Publication date: June 16, 2016
    Inventors: Hsiang-Wei Hwang, Yung-Hung Chen, Han-Chi Liu
  • Publication number: 20160120463
    Abstract: A vessel sensing device with automatic amendment function includes an analog processing circuit, a signal generating circuit and a DC voltage detecting circuit. The analog processing circuit includes an optical sensing module. An optical sensor of the optical sensing module generates an analog signal with a skin characteristic signal and a vessel characteristic signal according to an optical reflecting signal. The skin characteristic signal and the vessel characteristic signal respectively correspond to a skin feature and a vessel feature of the user. The signal generating circuit is coupled to the analog processing circuit to transform the analog signal into a compensation signal. The DC voltage detecting circuit is coupled to the signal generating circuit and adapted to compensate the analog processing circuit according to the compensation signal, so as to decrease the skin characteristic signal within the analog signal.
    Type: Application
    Filed: June 22, 2015
    Publication date: May 5, 2016
    Inventors: Peng-Sheng Chen, Hsiang-Wei Hwang, Jui-Te Chiu
  • Publication number: 20160128146
    Abstract: A current-steering DAC circuit for switching a light emitting diode, the current-steering DAC circuit including a current-steering DAC and a resistor. The current-steering DAC outputs a stable current and includes a plurality of current-steering units with a first output end and a second output end. The first output end is electrically connected to the light emitting diode, and the second output end is electrically connected to the resistor. Each of the current-steering units includes a current source and a switching circuit. A first end of the switching circuit is electrically connected to the current source. A second end and a third end of the switching circuit are electrically connected to the first output end and the second output end of the current-steering DAC, respectively. The switching circuit is controlled by a switching signal so as to selectively connect one of the second end and the third end to the first end.
    Type: Application
    Filed: March 2, 2015
    Publication date: May 5, 2016
    Inventors: CHIA-HSUN WU, PENG-SHENG CHEN, HSIANG-WEI HWANG, JUI-TE CHIU