Patents by Inventor Du Chen
Du Chen 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).
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Patent number: 10845930Abstract: Some touch screens can be formed by at least partially integrating touch sensing circuitry into a display pixel stackup. In some examples, noise can be introduced into touch sensor panel measurements, for example, from display data lines of a display device proximate to the touch sensor panel. In some examples, rows or columns of touch electrodes can be split and a first portion of the touch sensor panel can be stimulated to measure capacitance and noise and a second portion of the touch sensor panel can be unstimulated and measure noise. In some examples, both the first and the second portions of the touch sensor panel can be stimulated using orthogonal stimulation codes. In some examples, measurements from the first and/or second portions of the touch sensor panel can be subtracted from measurements from the other portion of the touch sensor panel to eliminate or reduce common mode noise.Type: GrantFiled: August 26, 2019Date of Patent: November 24, 2020Assignee: Apple Inc.Inventors: Christoph H. Krah, Du Chen
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Publication number: 20200103993Abstract: Some touch screens can be formed by at least partially integrating touch sensing circuitry into a display pixel stackup. In some examples, noise can be introduced into touch sensor panel measurements, for example, from display data lines of a display device proximate to the touch sensor panel. In some examples, rows or columns of touch electrodes can be split and a first portion of the touch sensor panel can be stimulated to measure capacitance and noise and a second portion of the touch sensor panel can be unstimulated and measure noise. In some examples, both the first and the second portions of the touch sensor panel can be stimulated using orthogonal stimulation codes. In some examples, measurements from the first and/or second portions of the touch sensor panel can be subtracted from measurements from the other portion of the touch sensor panel to eliminate or reduce common mode noise.Type: ApplicationFiled: August 26, 2019Publication date: April 2, 2020Inventors: Christoph H. KRAH, Du CHEN
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Patent number: 10591318Abstract: A circuit includes a sensor and a half-bridge circuit. The sensor includes a first sensor capacitor and a second sensor capacitor, where capacitances of the first sensor capacitor and the second sensor capacitor change in opposing directions responsive to receiving a physical signal. The sensor generates a plurality of sensor signals according to the physical signal, the plurality of signals including a common mode injection and a plurality of differential signals. The half-bridge circuit includes a first half-bridge capacitor and a second half-bridge capacitor, where capacitances of the first half-bridge capacitor and the second half-bridge capacitor compensate for the common mode injection of the plurality of sensor signals. The sensor and the half-bridge circuit are coupled to a plurality of sense nodes configured to output the plurality of differential signals.Type: GrantFiled: August 31, 2017Date of Patent: March 17, 2020Assignee: InvenSense, Inc.Inventors: Pablo Moreno Galbis, Du Chen, Stanley Bo-Ting Wang
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Patent number: 10574259Abstract: A system includes a sensor device, a circuit driving he sensor device at a drive frequency, a receiver, and a low pass filter. The sensor device is configured to change its electrical characteristics in response to external stimuli. The sensor device generates a modulated signal proportional to the external stimuli. The receiver is configured to receive the modulated signal and further configured to demodulate the modulated signal to generate a demodulated signal. The demodulation signal has a guard band. The receiver consumes power responsive to receiving the modulated signal. The low pass filter is configured to receive the demodulated signal and further configured to generate a sensor output.Type: GrantFiled: October 3, 2017Date of Patent: February 25, 2020Assignee: InvenSense, Inc.Inventors: Du Chen, Vadim Tsinker, Stanley Bo-Ting Wang
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Publication number: 20190103880Abstract: A system includes a sensor device, a circuit driving he sensor device at a drive frequency, a receiver, and a low pass filter. The sensor device is configured to change its electrical characteristics in response to external stimuli. The sensor device generates a modulated signal proportional to the external stimuli. The receiver is configured to receive the modulated signal and further configured to demodulate the modulated signal to generate a demodulated signal. The demodulation signal has a guard band. The receiver consumes power responsive to receiving the modulated signal. The low pass filter is configured to receive the demodulated signal and further configured to generate a sensor output.Type: ApplicationFiled: October 3, 2017Publication date: April 4, 2019Inventors: Du CHEN, Vadim TSINKER, Stanley Bo-Ting WANG
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Publication number: 20190063957Abstract: A circuit includes a sensor and a half-bridge circuit. The sensor includes a first sensor capacitor and a second sensor capacitor, where capacitances of the first sensor capacitor and the second sensor capacitor change in opposing directions responsive to receiving a physical signal. The sensor generates a plurality of sensor signals according to the physical signal, the plurality of signals including a common mode injection and a plurality of differential signals. The half-bridge circuit includes a first half-bridge capacitor and a second half-bridge capacitor, where capacitances of the first half-bridge capacitor and the second half-bridge capacitor compensate for the common mode injection of the plurality of sensor signals. The sensor and the half-bridge circuit are coupled to a plurality of sense nodes configured to output the plurality of differential signals.Type: ApplicationFiled: August 31, 2017Publication date: February 28, 2019Applicant: InvenSense, Inc.Inventors: Pablo MORENO GALBIS, Du CHEN, Stanley Bo-Ting WANG
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Patent number: 9348043Abstract: An apparatus and a method for detecting vibration are disclosed. The apparatus comprises a housing, a magnetic structure forming a magnetic field in the housing, and a coil structure in the magnetic field, concentric of the magnetic structure. In response to external vibration, the coil structure and the magnetic structure are movable with respect to each other. The coil structure comprises at least two sets of coils overlapped in space, of which a first coil set is for detecting vibration and a second coil set is for applying control in accordance with a control signal.Type: GrantFiled: March 24, 2014Date of Patent: May 24, 2016Assignee: SAS E&P LTD.Inventors: Zhentang Fu, Chunhua Gao, Du Chen
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Patent number: 9285207Abstract: A method and system for measuring displacement of a structure is disclosed. The method and system comprise providing a first capacitance and providing a second capacitance. The first and second capacitances share a common terminal. The method and system further include determining a difference of the inverses of the value of the first and second capacitances when the structure is displaced. The first capacitance varies in inverse relation to the displacement of the structure.Type: GrantFiled: July 26, 2013Date of Patent: March 15, 2016Assignee: INVENSENSE, INC.Inventors: Baris Cagdaser, Du Chen, Hasan Akyol, Derek Shaeffer
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Publication number: 20140293752Abstract: An apparatus and a method for detecting vibration are disclosed. The apparatus comprises a housing, a magnetic structure forming a magnetic field in the housing, and a coil structure in the magnetic field, concentric of the magnetic structure. In response to external vibration, the coil structure and the magnetic structure are movable with respect to each other. The coil structure comprises at least two sets of coils overlapped in space, of which a first coil set is for detecting vibration and a second coil set is for applying control in accordance with a control signal.Type: ApplicationFiled: March 24, 2014Publication date: October 2, 2014Applicant: SAS E&P LTD.Inventors: Zhentang FU, Chunhua GAO, Du CHEN
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Publication number: 20140266256Abstract: A method and system for measuring displacement of a structure is disclosed. The method and system comprise providing a first capacitance and providing a second capacitance. The first and second capacitances share a common terminal. The method and system further include determining a difference of the inverses of the value of the first and second capacitances when the structure is displaced. The first capacitance varies in inverse relation to the displacement of the structure.Type: ApplicationFiled: July 26, 2013Publication date: September 18, 2014Applicant: InvenSense, Inc.Inventors: Baris CAGDASER, Du CHEN, Hasan AKYOL, Derek SHAEFFER
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Patent number: 8723600Abstract: A circuit utilizes a MOS device in a triode mode of operation and includes a biasing circuit and a MOS device. The MOS device has a drain, a source, and a gate terminal, and is coupled to the biasing circuit. The source terminal, drain terminal, and gate terminal each has a potential and the drain and the source terminals have a resistance. The biasing circuit couples the drain and source terminals of the MOS device to the gate terminal of the MOS device. The biasing circuit couples a DC potential to the gate terminal to adjust the resistance between the source and drain terminals of the MOS device. The resistance between the source and drain terminals is a non-linear function of voltage potentials at the source and drain terminals. The biasing circuit reduces the non-linearity of the resistance between the drain and source terminals by modulating the potential at the gate terminal by a combination of source and drain terminal potentials.Type: GrantFiled: February 22, 2013Date of Patent: May 13, 2014Assignee: Invensense, Inc.Inventors: Baris Cagdaser, Du Chen
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Publication number: 20140118073Abstract: A circuit utilizes a MOS device in a triode mode of operation and includes a biasing circuit and a MOS device. The MOS device has a drain, a source, and a gate terminal, and is coupled to the biasing circuit. The source terminal, drain terminal, and gate terminal each has a potential and the drain and the source terminals have a resistance. The biasing circuit couples the drain and source terminals of the MOS device to the gate terminal of the MOS device. The biasing circuit couples a DC potential to the gate terminal to adjust the resistance between the source and drain terminals of the MOS device. The resistance between the source and drain terminals is a non-linear function of voltage potentials at the source and drain terminals. The biasing circuit reduces the non-linearity of the resistance between the drain and source terminals by modulating the potential at the gate terminal by a combination of source and drain terminal potentials.Type: ApplicationFiled: February 22, 2013Publication date: May 1, 2014Applicant: INVENSENSE, INC.Inventors: Baris Cagdaser, Du Chen
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Patent number: 8305140Abstract: Active resistive circuitry (10, 10A, 11, 11A 25, 30, 35, or 40) includes a first current divider circuit (11) having an input (15) coupled to a first signal (Vi). The first current divider circuit (11) includes a first amplifier (13) having a first input (?) coupled to the first signal (Vi). A symmetrically bilateral first bidirectional circuit (M1a,M1b; R1) is coupled between the first input (?) of the first amplifier (13) and an output (17) of the first amplifier (13), and functions as a feedback circuit of the first amplifier (13). A symmetrically bilateral second bidirectional circuit (M2a,M2b; R2) is coupled between the output (17) of the first amplifier (13) and an output (18) of the first current divider circuit (11).Type: GrantFiled: September 7, 2011Date of Patent: November 6, 2012Assignee: Texas Instruments IncorporatedInventors: Du Chen, Kemal S. Demirci
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Patent number: 8139654Abstract: A method for coding time signals based on generating an asynchronous biphasic pulse train is provided. The method includes generating response signals based upon one or more input signals. A pulse comprises a positive pulse if a voltage of the response signal is greater than a predetermined positive voltage threshold. A pulse comprises a negative pulse if the voltage of the response signal is less than a predetermined negative voltage threshold. The method further includes a method for the reconstruction of a uniformly sampled version of the original signal.Type: GrantFiled: August 8, 2006Date of Patent: March 20, 2012Assignee: University of Florida Research FoundationInventors: Du Chen, John G. Harris, Jose C. Principe
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Patent number: 7430340Abstract: A method to compress a very large original geographic database down to a manageable and economical size while preserving accuracy is herein described. Similarly, a method to quickly retrieve, decompress, and display data is herein described. An original geographic database is prepared for compression by dividing it into discrete regions called bounding boxes. The bounding boxes may be variable sized to improve accuracy and compression. Absolute map coordinate data is compressed by converting it to relative map coordinate data. Map files are named in a descriptive manner to allow determination of map file characteristics merely by inspecting the file name. Relative map coordinate data can be displayed without being converted to absolute map coordinate data. Alternately, relative map coordinate data may be quickly decompressed into absolute coordinate data. Retrieving compressed data is facilitated by forming view windows having adjacent load regions pre-decompressed and ready for user display.Type: GrantFiled: March 16, 2005Date of Patent: September 30, 2008Assignee: Advanced Tracking Technologies, Inc.Inventors: Paul M. Glass, Vernon C. Dotson, Du Chen, Susan M. Kight, Jeffrey M. Buske
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Publication number: 20080192841Abstract: A method for coding time signals based on generating an asynchronous biphasic pulse train is provided. The method includes generating response signals based upon one or more input signals. A pulse comprises a positive pulse if a voltage of the response signal is greater than a predetermined positive voltage threshold. A pulse comprises a negative pulse if the voltage of the response signal is less than a predetermined negative voltage threshold. The method further includes a method for the reconstruction of a uniformly sampled version of the original signal.Type: ApplicationFiled: August 8, 2006Publication date: August 14, 2008Applicant: UNIVERSITY OF FLORIDA RESEARCH FOUNDATION, INCInventors: Du Chen, John G. Harris, Jose C. Principe
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Patent number: 7324035Abstract: An amplifier-based system having pulsed output includes an amplifier for amplifying a time varying voltage signal to produce an output voltage signal. A voltage-to-current (V-I) converter converts the output voltage signal into a current signal. An output stage including a current integrator integrates the current signal to generate an integrated voltage. An amplitude to time converter generates a pulse train from the integrated voltage, wherein a timing of the pulses in the pulse train represents the original time varying voltage signal. The pulse train representation permits transmission and accurate remote reconstruction of the original time varying voltage signal, such as signals generated by electrodes implanted inside a subject, including neural signals.Type: GrantFiled: May 13, 2004Date of Patent: January 29, 2008Assignee: University of Florida Research Foundation, Inc.Inventors: John G. Harris, Du Chen, Dazhi Wei, Jose C. Principe
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Publication number: 20070273411Abstract: An amplifier-based system having pulsed output includes an amplifier for amplifying a time varying voltage signal to produce an output voltage signal. A voltage-to-current (V-I) converter converts the output voltage signal into a current signal. An output stage including a current integrator integrates the current signal to generate an integrated voltage. An amplitude to time converter generates a pulse train from the integrated voltage, wherein a timing of the pulses in the pulse train represents the original time varying voltage signal. The pulse train representation permits transmission and accurate remote reconstruction of the original time varying voltage signal, such as signals generated by electrodes implanted inside a subject, including neural signals.Type: ApplicationFiled: May 13, 2004Publication date: November 29, 2007Applicant: University of FloridaInventors: John Harris, Du Chen, Dazhi Wei, Jose Principe
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Publication number: 20050288836Abstract: A method to compress a very large original geographic database down to a manageable and economical size while preserving accuracy is herein described. Similarly, a method to quickly retrieve, decompress, and display data is herein described. An original geographic database is prepared for compression by dividing it into discrete regions called bounding boxes. The bounding boxes may be variable sized to improve accuracy and compression. Absolute map coordinate data is compressed by converting it to relative map coordinate data. Map files are named in a descriptive manner to allow determination of map file characteristics merely by inspecting the file name. Relative map coordinate data can be displayed without being converted to absolute map coordinate data. Alternately, relative map coordinate data may be quickly decompressed into absolute coordinate data. Retrieving compressed data is facilitated by forming view windows having adjacent load regions pre-decompressed and ready for user display.Type: ApplicationFiled: March 16, 2005Publication date: December 29, 2005Inventors: Paul Glass, Vernon Dotson, Du Chen, Susan Kight, Jeffrey Buske
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Patent number: 6853084Abstract: The present invention discloses a substrate within a Ni/Au structure electroplated on electrical contact pads and a method for fabricating the same. The method comprises: providing a substrate with a circuit layout pattern and forming a conducting film on the surface of the substrate; depositing a first photoresist layer within an opening on said electrical conducting film surface to expose a portion of said circuit layout pattern to be electrical contact pads; removing the exposed conducting film uncovered by the first photoresist layer; depositing a second photoresist layer, covering the conducting film exposed in the openings of the first photoresist layer; electroplating Ni/Au covering the surface of the electrical contact pads; removing the first and second photoresists, and the conducting film covered by the photoresists; depositing solder mask on the substrate within an opening to expose said electrical contact pads.Type: GrantFiled: February 10, 2003Date of Patent: February 8, 2005Assignee: Phoenix Precision TechnologyInventors: Shih-Ping Hsu, Chiang-Du Chen, Yen-Hung Liu