Patents by Inventor James Thomas Deas
James Thomas Deas 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: 11267695Abstract: Micro-electro-mechanical system (MEMS) devices are disclosed, including a MEMS device comprising a semiconductor die including integrated circuitry, a structure mounted on the semiconductor die and covering at least a portion of the circuitry, the structure defining a space between the structure and the at least a portion of the circuitry, and a transducer including a membrane, the transducer located outside of the space.Type: GrantFiled: April 12, 2018Date of Patent: March 8, 2022Assignee: Cirrus Logic, Inc.Inventors: James Thomas Deas, Colin Wei Hong Chung, Marek Sebastian Piechocinski
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Patent number: 10674298Abstract: The application describes a MEMS transducer in which first and second conductive elements of a capacitor are both provided on the membrane. The membrane is shaped such that the first and second conductive elements are displaced relative to each other when the flexible membrane deflects in response to a pressure differential across the membrane. For example the membrane may be corrugated.Type: GrantFiled: September 20, 2018Date of Patent: June 2, 2020Assignee: Cirrus Logic, Inc.Inventors: James Thomas Deas, Scott Lyall Cargill
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Patent number: 10582309Abstract: This applications relates to methods and apparatus for amplifying signals from capacitive transducers, in particular MEMS transducers such as MEMS capacitive microphones. An amplifier circuit has a signal node for receiving the input signal, a transducer biasing node for outputting a transducer bias voltage for biasing the capacitive transducer, and a voltage buffer configured to generate a buffered bias voltage at a buffer node. An amplifier arrangement is configured to receive the input signal from the signal node and the buffered bias voltage.Type: GrantFiled: August 23, 2019Date of Patent: March 3, 2020Assignee: Cirrus Logic, Inc.Inventors: Hynek Saman, James Thomas Deas
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Publication number: 20200055726Abstract: Micro-electro-mechanical system (MEMS) devices are disclosed, including a MEMS device comprising a semiconductor die including integrated circuitry, a structure mounted on the semiconductor die and covering at least a portion of the circuitry, the structure defining a space between the structure and the at least a portion of the circuitry, and a transducer including a membrane, the transducer located outside of the space.Type: ApplicationFiled: April 12, 2018Publication date: February 20, 2020Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: James Thomas DEAS, Colin Wei Hong CHUNG, Marek Sebastian PIECHOCINSKI
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Publication number: 20190379984Abstract: This applications relates to methods and apparatus for amplifying signals from capacitive transducers, in particular MEMS transducers such as MEMS capacitive microphones. An amplifier circuit has a signal node for receiving the input signal, a transducer biasing node for outputting a transducer bias voltage for biasing the capacitive transducer, and a voltage buffer configured to generate a buffered bias voltage at a buffer node. An amplifier arrangement is configured to receive the input signal from the signal node and the buffered bias voltage.Type: ApplicationFiled: August 23, 2019Publication date: December 12, 2019Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Hynek SAMAN, James Thomas DEAS
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Patent number: 10455331Abstract: An amplifier circuit has a transducer biasing node for outputting a transducer bias voltage for biasing the capacitive transducer and a signal node for receiving the input signal. An amplifier arrangement comprising a feedback resistor network provides an amplified output signal. A voltage buffer provides a buffered bias voltage at a buffer node which is connected to a terminal of the feedback resistor network, to at least partly define the quiescent level of the output signal. The buffer node is electrically coupled to the transducer biasing node via a capacitance which may form part of a bias filter.Type: GrantFiled: March 9, 2018Date of Patent: October 22, 2019Assignee: Cirrus Logic, Inc.Inventors: Hynek Saman, James Thomas Deas
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Publication number: 20190306621Abstract: The present disclosure relates to a protection system for protecting a MEMS transducer of a MEMS device from electrostatic capture, wherein the MEMS transducer is operable in a normal-sensitivity, mode and in a reduced-sensitivity mode.Type: ApplicationFiled: March 29, 2018Publication date: October 3, 2019Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Ian Johnson SMITH, James Thomas DEAS, Vivek SARAF
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Patent number: 10433054Abstract: The present disclosure relates to a protection system for protecting a MEMS transducer of a MEMS device from electrostatic capture, wherein the MEMS transducer is operable in a normal-sensitivity, mode and in a reduced-sensitivity mode.Type: GrantFiled: March 29, 2018Date of Patent: October 1, 2019Assignee: Cirrus Logic, Inc.Inventors: Ian Johnson Smith, James Thomas Deas, Vivek Saraf
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Patent number: 10313800Abstract: MEMS devices are disclosed including a MEMS microphone device comprising a first transducer adjoining a sound port, a second transducer not adjoining a sound port, a housing defining a shared volume for the first and second transducers, and circuitry arranged to combine a first signal from the first transducer and a second signal from the second transducer to produce an output signal.Type: GrantFiled: April 5, 2018Date of Patent: June 4, 2019Assignee: Cirrus Logic, Inc.Inventor: James Thomas Deas
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Patent number: 10244331Abstract: The present disclosure relates to a micro electro-mechanical system (MEMS) device comprising a fixed electrode, a moveable electrode that is moveable with respect to the fixed electrode and an output terminal for outputting a transducer output signal indicative of a capacitance between the fixed electrode and the moveable electrode. A package is provided which houses the fixed electrode and the moveable electrode, the package defining a first volume on a first side of the moveable electrode. The moveable electrode is moveable within the first volume in response to sound or pressure waves incident on the moveable electrode. A power dissipation element is disposed within the package. The power dissipation element is configured to receive a generated stimulus signal and to dissipate heat into the first volume so as to modulate the pressure of air within the first volume in accordance with the received generated stimulus signal.Type: GrantFiled: April 13, 2018Date of Patent: March 26, 2019Assignee: Cirrus Logic, Inc.Inventors: James Thomas Deas, John Paul Lesso
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Publication number: 20190020962Abstract: The application describes a MEMS transducer in which first and second conductive elements of a capacitor are both provided on the membrane. The membrane is shaped that the first and second conductive elements are displaced relative to each other when the flexible membrane deflects in response to a pressure differential across the membrane. For example the membrane may be corrugated.Type: ApplicationFiled: September 20, 2018Publication date: January 17, 2019Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: James Thomas DEAS, Scott Lyall CARGILL
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Patent number: 10117020Abstract: A system may include control circuitry for detecting a plosive event associated with a microphone transducer and in response to the plosive event, causing restoration of acoustic sense operation of the microphone transducer and a processing circuit associated with the microphone transducer. A system for configuring a filter having at least two frequency response configurations to achieve an effective frequency response configuration intermediate to the at least two frequency response configurations may include control circuitry for rapidly switching between the at least two frequency response configurations such that a weighted average frequency response of the filter corresponds to the effective frequency response configuration.Type: GrantFiled: April 18, 2016Date of Patent: October 30, 2018Assignee: Cirrus Logic, Inc.Inventors: Jaimin Mehta, James Thomas Deas, Stephen T. Hodapp, Brian Parker Chesney
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Patent number: 10111021Abstract: The application describes a MEMS transducer in which first and second conductive elements of a capacitor are both provided on the membrane. The membrane is shaped that the first and second conductive elements are displaced relative to each other when the flexible membrane deflects in response to a pressure differential across the membrane. For example the membrane may be corrugated.Type: GrantFiled: July 26, 2017Date of Patent: October 23, 2018Assignee: Cirrus Logic, Inc.Inventors: James Thomas Deas, Scott Lyall Cargill
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Publication number: 20180301920Abstract: Devices are disclosed including a transducer device comprising a first circuit for operating a MEMS transducer and connected to a supply terminal for receiving a power supply voltage, and a power consumption levelling circuit for dissipating a correction power and arranged to adjust the correction power to at least partially offset a change in power consumption of the first circuit due to a change in the power supply voltage.Type: ApplicationFiled: April 12, 2018Publication date: October 18, 2018Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: James Thomas DEAS, Paul WILSON
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Publication number: 20180302727Abstract: MEMS devices are disclosed including a MEMS microphone device comprising a first transducer adjoining a sound port, a second transducer not adjoining a sound port, a housing defining a shared volume for the first and second transducers, and circuitry arranged to combine a first signal from the first transducer and a second signal from the second transducer to produce an output signal.Type: ApplicationFiled: April 5, 2018Publication date: October 18, 2018Applicant: Cirrus Logic International Semiconductor Ltd.Inventor: James Thomas DEAS
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Publication number: 20180270588Abstract: This applications relates to methods and apparatus for amplifying signals from capacitive transducers, in particular MEMS transducers such as MEMS capacitive microphones. An amplifier circuit has a transducer biasing node (102) for outputting a transducer bias voltage for biasing the capacitive transducer (101) and a signal node (103) for receiving the input signal (Vin). An amplifier arrangement (108) comprising a feedback resistor network (304, 305) provides an amplified output signal (Vout). A voltage buffer (306) provides a buffered bias voltage at a buffer node (307) which is connected to a terminal of the feedback resistor network, to at least partly define the quiescent level of the output signal. The buffer node (307) is electrically coupled to the transducer biasing node (102) via a capacitance (106) which may form part of a bias filter.Type: ApplicationFiled: March 9, 2018Publication date: September 20, 2018Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: Hynek Saman, James Thomas Deas
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Patent number: 10070223Abstract: This application relates to circuitry for processing sense signals generated by MEMS capacitive transducers for compensating for distortion in such sense signals. The circuitry has a signal path between an input (204) for receiving the sense signal and an output (205) for outputting an output signal based on said sense signal. Compensation circuitry (206, 207) is configured to monitor the signal at a first point along the signal path and generate a correction signal (Scorr); and modify the signal at at least a second point along said signal path based on said correction signal. The correction signal is generated as a function of the value of the signal at the first point along the signal path so as to introduce compensation components into the output signal that compensate for distortion components in the sense signal. The first point in the signal path may be before or after the second point in the signal path.Type: GrantFiled: June 20, 2017Date of Patent: September 4, 2018Assignee: Cirrus Logic, Inc.Inventors: John Paul Lesso, Emmanuel Philippe Christian Hardy, James Thomas Deas, Toru Ido
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Publication number: 20180035229Abstract: The application describes a MEMS transducer in which first and second conductive elements of a capacitor are both provided on the membrane. The membrane is shaped that the first and second conductive elements are displaced relative to each other when the flexible membrane deflects in response to a pressure differential across the membrane. For example the membrane may be corrugated.Type: ApplicationFiled: July 26, 2017Publication date: February 1, 2018Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: James Thomas DEAS, Scott Lyall CARGILL
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Publication number: 20170284825Abstract: This application relates to circuitry for processing sense signals generated by MEMS capacitive transducers for compensating for distortion in such sense signals. The circuitry has a signal path between an input (204) for receiving the sense signal and an output (205) for outputting an output signal based on said sense signal. Compensation circuitry (206, 207) is configured to monitor the signal at a first point along the signal path and generate a correction signal (Scorr); and modify the signal at at least a second point along said signal path based on said correction signal. The correction signal is generated as a function of the value of the signal at the first point along the signal path so as to introduce compensation components into the output signal that compensate for distortion components in the sense signal. The first point in the signal path may be before or after the second point in the signal path.Type: ApplicationFiled: June 20, 2017Publication date: October 5, 2017Applicant: Cirrus Logic International Semiconductor Ltd.Inventors: John Paul LESSO, Emmanuel Philippe Christian HARDY, James Thomas DEAS, Toru IDO
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Patent number: 9716945Abstract: This application relates to circuitry for processing sense signals generated by MEMS capacitive transducers for compensating for distortion in such sense signals. The circuitry has a signal path between an input (204) for receiving the sense signal and an output (205) for outputting an output signal based on said sense signal. Compensation circuitry (206, 207) is configured to monitor the signal at a first point along the signal path and generate a correction signal (Scorr); and modify the signal at at least a second point along said signal path based on said correction signal. The correction signal is generated as a function of the value of the signal at the first point along the signal path so as to introduce compensation components into the output signal that compensate for distortion components in the sense signal. The first point in the signal path may be before or after the second point in the signal path.Type: GrantFiled: April 23, 2014Date of Patent: July 25, 2017Assignee: Cirrus Logic International Semiconductor Ltd.Inventors: John Paul Lesso, Emmanuel Philippe Christian Hardy, James Thomas Deas, Toru Ido