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公开(公告)号：US20220369043A1
公开(公告)日：2022-11-17
申请号：US17879454
申请日：2022-08-02
发明人： Craig Core , Hamid Basaeri , Robert Littrell
摘要： A robust MEMS transducer includes a kinetic energy diverter disposed within its frontside cavity. The kinetic energy diverter blunts or diverts kinetic energy in a mass of air moving through the frontside cavity, before that kinetic energy reaches a diaphragm of the MEMS transducer. The kinetic energy diverter renders the MEMS transducer more robust and resistant to damage from such a moving mass of air.
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公开(公告)号：US20220365128A1
公开(公告)日：2022-11-17
申请号：US17741246
申请日：2022-05-10
发明人： Michael Carfore
IPC分类号： G01R31/28
摘要： An apparatus for testing a transducer module includes a test signal generator coupled to a common-mode terminal common to a plurality of transducers, and a signal processing circuit configured to receive output signal from each of said transducers and to produce an output signal. If the transducers are well matched to one another, the output signal will have little or no output amplitude. If there is a mismatch between the transducers, however, the output signal will have an amplitude proportional to the mismatch. The amplitude of the output signal may be compared to a predetermined threshold in order to produce a mismatch output signal indicating the existence of, and/or the degree of, mismatch between the transducers.
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公开(公告)号：US11363387B2
公开(公告)日：2022-06-14
申请号：US17165998
申请日：2021-02-03
发明人： Robert Littrell , Ronald Gagnon
摘要： A MEMS transducer system has a transducer configured to convert a received signal into an output signal for forwarding by a transducer output port, and an integrated circuit having an IC input in communication with the transducer output port. The IC input is configured to receive an IC input signal produced as a function of the output signal. The system also has a dividing element coupled between the IC input and the transducer output port. The dividing element is configured to selectively attenuate one or more signals into the IC input to at least in part produce the IC input signal. Other implementations may couple a feedback loop to the ground of the transducer (similar to bootstrapping), or pick off voltages at specific portions of the transducer.
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公开(公告)号：US11099078B1
公开(公告)日：2021-08-24
申请号：US16110528
申请日：2018-08-23
发明人： Robert Littrell , Yu Hui , Craig Core , Ronald Gagnon
摘要： An acoustic sensor has a MEMS die with MEMS structure. Among other things, the MEMS structure includes a diaphragm configured to mechanically respond to incident acoustic signals, and a temperature sensor member configured to detect temperature.
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公开(公告)号：US10771889B2
公开(公告)日：2020-09-08
申请号：US15357075
申请日：2016-11-21
发明人： Robert J. Littrell
摘要： A package comprises: a transducer; a substrate comprising an acoustic port, with the transducer attached to a surface of the substrate and over or adjacent to the acoustic port; and a venting mechanism for venting air or sound pressure from a device comprising the package, with the venting mechanism being affixed to the substrate and partially surrounding the acoustic port, and with the venting mechanism being dimensioned to filter out audio frequencies.
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公开(公告)号：US20220360894A1
公开(公告)日：2022-11-10
申请号：US17741215
申请日：2022-05-10
发明人： Michael Carfore , Tomer Saraf
IPC分类号： H04R3/00 , H01L41/113
摘要： Illustrative embodiments enable a MEMS transducer to quickly recover from, acoustic overload events by quickly resetting signal processing circuitry downstream from a MEMS transducer. An acoustic overload sensor detects occurrence of an acoustic overload event, and triggers a reset circuit to operate a set of switches to rapidly drain charge from a corresponding set of capacitances within the transducer, or within the signal processing circuitry, thereby resetting the signal processing circuitry more rapidly than would occur if said transducer or circuitry were allowed to recover on its own.
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公开(公告)号：US20220317148A1
公开(公告)日：2022-10-06
申请号：US17807310
申请日：2022-06-16
发明人： Robert J. Littrell
摘要： A sensor device that senses proper acceleration. The sensor device includes a substrate, a spacer layer supported over a first surface of the substrate, at least a first tapered cantilever beam element having a base and a tip, the base attached to the spacer layer, and which is supported over and spaced from the substrate by the spacer layer. The at least first tapered cantilever beam element tapers in width from the base portion to the tip portion. The at least first cantilever beam element further including at least a first layer comprised of a piezoelectric material, a pair of electrically conductive layers disposed on opposing surfaces of the first layer, and a mass supported at the tip portion of the at least first tapered cantilever beam element.
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公开(公告)号：US11228843B2
公开(公告)日：2022-01-18
申请号：US16334678
申请日：2017-10-06
发明人： Ronald Gagnon , Chen-Wei Huang
摘要： A device includes: a piezoelectric transducer; a field effect transistor (FET) configured to provide a sub-threshold conduction path for leakage current across the piezoelectric transducer; wherein the FET comprises a gate; wherein each of a width and a length of the gate has a size in accordance with the sub-threshold conduction path being configured to substantially maintain an input voltage to the piezoelectric transducer across a path of the leakage current of the piezoelectric transducer.
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公开(公告)号：US20210360347A1
公开(公告)日：2021-11-18
申请号：US17318980
申请日：2021-05-12
发明人： Julian Aschieri
摘要： A transducer system has a transducer configured to receive an incident signal and produce an output signal as a function of the incident signal. As known in the art, the output signal has a −3 dB point. The transducer system also has circuitry operatively coupled with the transducer. The circuitry includes an amplifier with an output configured to produce an amplified signal as a function of the output signal. In addition, the circuitry further has a positive feedback loop and a negative feedback loop that both are electrically coupled between the transducer and the amplifier. The positive feedback loop is configured to move the −3 dB point in a first frequency direction. Conversely, the negative feedback loop is configured to move the −3 dB point in a second frequency direction. Preferably, the first and second frequency directions are different.
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公开(公告)号：US10917727B2
公开(公告)日：2021-02-09
申请号：US16353589
申请日：2019-03-14
发明人： Robert Littrell , Ronald Gagnon
摘要： A MEMS transducer system has a transducer configured to convert a received signal into an output signal for forwarding by a transducer output port, and an integrated circuit having an IC input in communication with the transducer output port. The IC input is configured to receive an IC input signal produced as a function of the output signal. The system also has a dividing element coupled between the IC input and the transducer output port. The dividing element is configured to selectively attenuate one or more signals into the IC input to at least in part produce the IC input signal. Other implementations may couple a feedback loop to the ground of the transducer (similar to bootstrapping), or pick off voltages at specific portions of the transducer.
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