Patents by Inventor Chi Cao
Chi Cao 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: 12111216Abstract: A temperature sensor circuits includes a temperature sensing module, a current generator, a current controlled oscillator, and a counter. The temperature sensing module is sensitive to temperature changes. The current generator respectively generates a positive temperature coefficient current positively related to temperature and a negative temperature coefficient current negatively related to temperature according to the temperature sensed by the temperature induction module. The current controlled oscillator oscillates according to the positive and the negative temperature coefficient currents respectively and outputs a positive and negative temperature coefficient oscillation signals.Type: GrantFiled: November 30, 2021Date of Patent: October 8, 2024Assignee: INNOGRIT TECHNOLOGIES CO., LTD.Inventors: Chi Cao, Guanyu Qian, Kangmin Hu
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Patent number: 11705865Abstract: The present disclosure relates to a relaxation oscillator, an integrated circuit and an electronic apparatus, the relaxation oscillator comprising a first signal generation module and an oscillation module configured to output a first oscillation signal and a second oscillation signal, the first oscillation signal and the second oscillation signal being opposite in phase, the oscillation module comprising a first switch, a second switch, a capacitor, and a comparison unit. The oscillation module according to the disclosed embodiment using a floating amplifier to implement a comparator, where in a pre-charging stage, the first switch and the second switch are turned on to charge the capacitor, and a common mode of the first oscillation signal and the second oscillation signal is determined; in a comparing stage, the first switch and the second switch are turned off to output the oscillation signal.Type: GrantFiled: June 22, 2022Date of Patent: July 18, 2023Assignee: INNOGRIT TECHNOLOGIES CO., LTD.Inventors: Chi Cao, Kangmin Hu
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Publication number: 20230119770Abstract: A temperature sensor circuits includes a temperature sensing module, a current generator, a current controlled oscillator, and a counter. The temperature sensing module is sensitive to temperature changes. The current generator respectively generates a positive temperature coefficient current positively related to temperature and a negative temperature coefficient current negatively related to temperature according to the temperature sensed by the temperature induction module. The current controlled oscillator oscillates according to the positive and the negative temperature coefficient currents respectively and outputs a positive and negative temperature coefficient oscillation signals.Type: ApplicationFiled: November 30, 2021Publication date: April 20, 2023Inventors: Chi CAO, Guanyu QIAN, Kangmin HU
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Publication number: 20230083079Abstract: The present disclosure relates to a relaxation oscillator, an integrated circuit and an electronic apparatus, the relaxation oscillator comprising a first signal generation module and an oscillation module configured to output a first oscillation signal and a second oscillation signal, the first oscillation signal and the second oscillation signal being opposite in phase, the oscillation module comprising a first switch, a second switch, a capacitor, and a comparison unit. The oscillation module according to the disclosed embodiment using a floating amplifier to implement a comparator, where in a pre-charging stage, the first switch and the second switch are turned on to charge the capacitor, and a common mode of the first oscillation signal and the second oscillation signal is determined; in a comparing stage, the first switch and the second switch are turned off to output the oscillation signal.Type: ApplicationFiled: June 22, 2022Publication date: March 16, 2023Inventors: Chi CAO, Kangmin HU
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Patent number: 11329606Abstract: An oscillator circuit includes an integrator, a comparator, an edge triggered flip-flop, and first and second capacitors. The edge triggered flip-flop has an input terminal coupled to an output terminal of the comparator and is configured to output first and second signals which are mutually exclusive, and to flip the signals when detecting a rising or falling edge output by the comparator such that: when the first signal is at a designated level, the first capacitor is charged and the second capacitor is discharged, and a terminal of the first capacitor is coupled to an input terminal of the integrator; and when the second signal is at a designated level, the second capacitor is charged and the first capacitor is discharged and a terminal of the second capacitor is coupled to the input terminal of the integrator.Type: GrantFiled: May 21, 2021Date of Patent: May 10, 2022Assignee: INNOGRIT TECHNOLOGIES CO., LTD.Inventors: Chi Cao, Kangmin Hu
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Publication number: 20110271772Abstract: An accurate and low cost macro pressure sensor is described. The pressure sensor includes an array of capacitive sensing elements formed at the intersections of sets of conductors. A lower set of conductors is supported by a substrate and an upper set of conductors is supported on a flexible polymer membrane. Capacitive sensing elements are formed where a conductor in the upper set overlaps a spacer in the lower set. Separators hold the membrane away from the substrate with a separation that, because of deflection of the membrane, varies in relation to the pressure applied to the membrane. As a result, the separation of conductors, and therefore capacitance, in each cell varies in response to the applied pressure. By attaching the membrane to the separators and optionally using slits in the membrane between capacitive sensing elements, measurements made in each capacitive sensing element can be mechanically decoupled.Type: ApplicationFiled: April 14, 2011Publication date: November 10, 2011Applicant: Sierra Scientific Instruments, Inc.Inventors: Thomas R. Parks, Chi Cao
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Patent number: 7944008Abstract: An accurate and low cost macro pressure sensor is described. The pressure sensor includes an array of capacitive sensing elements formed at the intersections of sets of conductors. A lower set of conductors is supported by a substrate and an upper set of conductors is supported on a flexible polymer membrane. Capacitive sensing elements are formed where a conductor in the upper set overlaps a spacer in the lower set. Separators hold the membrane away from the substrate with a separation that, because of deflection of the membrane, varies in relation to the pressure applied to the membrane. As a result, the separation of conductors, and therefore capacitance, in each cell varies in response to the applied pressure. By attaching the membrane to the separators and optionally using slits in the membrane between capacitive sensing elements, measurements made in each capacitive sensing element can be mechanically decoupled.Type: GrantFiled: April 23, 2008Date of Patent: May 17, 2011Assignee: Sierra Scientific Instruments, LLCInventors: Thomas R. Parks, Chi Cao
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Publication number: 20090004767Abstract: An accurate and low cost macro pressure sensor is described. The pressure sensor includes an array of capacitive sensing elements formed at the intersections of sets of conductors. A lower set of conductors is supported by a substrate and an upper set of conductors is supported on a flexible polymer membrane. Capacitive sensing elements are formed where a conductor in the upper set overlaps a spacer in the lower set. Separators hold the membrane away from the substrate with a separation that, because of deflection of the membrane, varies in relation to the pressure applied to the membrane. As a result, the separation of conductors, and therefore capacitance, in each cell varies in response to the applied pressure. By attaching the membrane to the separators and optionally using slits in the membrane between capacitive sensing elements, measurements made in each capacitive sensing element can be mechanically decoupled.Type: ApplicationFiled: April 23, 2008Publication date: January 1, 2009Applicant: Sierra Scientific Instruments, Inc.Inventors: Thomas R. Parks, Chi Cao
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Publication number: 20090003669Abstract: A diagnostic system for display of physiological data in a format useful for identifying or diagnosing physiological conditions. The system registers visual representations of different types of physiological data to aid in an understanding of bodily processes. In addition to registering the data, the system may display different types of physiological data with different visual characteristics. Further, the transparency of the visual representations of the different datasets may be controlled to enhance the understandability of displayed information. The system, for example, can be used with data representative of pressure and impedance within a patient's gastrointestinal tract to provide greater understanding of physiological processes during a swallow.Type: ApplicationFiled: April 20, 2008Publication date: January 1, 2009Applicant: Sierra Scientific Instruments, Inc.Inventors: Thomas R. Parks, Chi Cao