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1.发明申请公开(公告)号：US20220394384A1
公开(公告)日：2022-12-08
申请号：US17819855
申请日：2022-08-15
发明人： Robert J. Littrell , Michael Carfore , Shuwan Xue
IPC分类号： H04R3/06 , H01L41/04 , H01L41/113 , H04R17/02 , G01R19/02
摘要： A device that includes an adaptive acoustic detection circuit and an acoustic sensor device such as a microphone is described. The device includes in addition to the sensor a circuit configured to detect when an input stimulus to the sensor satisfies an adaptive threshold, and further configured to produce a signal upon detection that causes adjustment of performance of the device, wherein the adaptive threshold is a threshold value that varies over time in accordance with detected changes to sound of an environment in which the device is located.
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公开(公告)号：US11438706B2
公开(公告)日：2022-09-06
申请号：US17143934
申请日：2021-01-07
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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3.发明授权公开(公告)号：US11259124B2
公开(公告)日：2022-02-22
申请号：US16353934
申请日：2019-03-14
发明人： Karl Grosh , Robert J. Littrell
IPC分类号： H04R17/02 , H04R31/00 , H04R7/06 , H01L41/27 , H01L41/314 , H01L41/332
摘要： A transducer of the preferred embodiment including a transducer and a plurality of adjacent, tapered cantilevered beams. Each of the beams define a beam base, a beam tip, and a beam body disposed between the beam base and the beam tip. The beams are arranged such that each of the beam tips extends toward a common area. Each beam is joined to the substrate along the beam base and is free from the substrate along the beam body. A preferred method of manufacturing a transducer can include: depositing alternating layers of piezoelectric and electrode onto the substrate in block, processing the deposited layers to define cantilever geometry in block, depositing metal traces in block, and releasing the cantilevered beams from the substrate in block.
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公开(公告)号：US20210160623A1
公开(公告)日：2021-05-27
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：US10825982B1
公开(公告)日：2020-11-03
申请号：US14851432
申请日：2015-09-11
发明人： Robert J. Littrell , Karl Grosh , Craig Core , Yu Hui , Wang Kyung Sung
IPC分类号： H01L41/23 , H01L41/113
摘要： A piezoelectric Micro-Electro-Mechanical Systems (MEMS) device comprising: a physical element; and a piezoelectric sensor element, with the physical element positioned in proximity to a moving portion of the piezoelectric sensor element, and with proximity of the physical element to the moving portion reducing a probability of breakage of the piezoelectric sensor element by limiting an excursion of the piezoelectric sensor element, relative to a probability of breakage of the piezoelectric sensor element in another piezoelectric MEMS device without the physical element.
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6.发明申请公开(公告)号：US20200344555A1
公开(公告)日：2020-10-29
申请号：US15930530
申请日：2020-05-13
发明人： Robert J. Littrell , Ronald Gagnon , Karl Grosh
摘要： A device comprising: a sensor; and a first circuit configured to detect when an input stimulus to the sensor satisfies one or more detection criteria, and further configured to produce a signal upon detection that causes adjustment of performance of the device; and a second circuit for processing input following detection, wherein the second circuit is configured to increase its power level following detection, relative to a power level of the second circuit prior to detection.
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公开(公告)号：US20200296530A1
公开(公告)日：2020-09-17
申请号：US16819673
申请日：2020-03-16
发明人： Robert J. Littrell
摘要： An acoustic device is described and includes an acoustic sensor element configured to sense acoustic energy and produce an output signal and a threshold detector circuit including a switch having an input coupled to the output of the acoustic sensor element to receive the output signal, a control port that receives a control signal, and first and second output ports, a first channel including an analog-to-digital converter that operates at a first power level a second analog-to-digital converter that operates at a second higher power level, relative to the first power level and a threshold level detector that receives an output from the first analog-to-digital converter to produce the control signal having a first state that causes the switch feed the output signal from the acoustic sensor element to the second analog-to-digital converter when the first digitized output signal meets a threshold criteria.
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公开(公告)号：US20200148532A1
公开(公告)日：2020-05-14
申请号：US16196922
申请日：2018-11-20
发明人： Karl Grosh , Robert J. Littrell
摘要： A microphone including a casing having a front wall, a back wall, and a side wall joining the front wall to the back wall, a transducer mounted to the front wall, the transducer including a substrate and a transducing element, the transducing element having a transducer acoustic compliance dependent on the transducing element dimensions, a back cavity cooperatively defined between the back wall, the side wall, and the transducer, the back cavity having a back cavity acoustic compliance. The transducing element is dimensioned such that the transducing element length matches a predetermined resonant frequency and the transducing element width, thickness, and elasticity produces a transducer acoustic compliance within a given range of the back cavity acoustic compliance.
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公开(公告)号：US10170685B2
公开(公告)日：2019-01-01
申请号：US14208827
申请日：2014-03-13
发明人： Karl Grosh , Robert J. Littrell
IPC分类号： H04R17/02 , H01L41/083 , H01L41/187 , H01L41/113 , B81B3/00 , H04R17/00
摘要： A microphone including a casing having a front wall, a back wall, and a side wall joining the front wall to the back wall, a transducer mounted to the front wall, the transducer including a substrate and a transducing element, the transducing element having a transducer acoustic compliance dependent on the transducing element dimensions, a back cavity cooperatively defined between the back wall, the side wall, and the transducer, the back cavity having a back cavity acoustic compliance. The transducing element is dimensioned such that the transducing element length matches a predetermined resonant frequency and the transducing element width, thickness, and elasticity produces a transducer acoustic compliance within a given range of the back cavity acoustic compliance.
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10.发明申请Acoustic Transducer with Gap-Controlling Geometry and Method of Manufacturing an Acoustic Transducer 审中-公开具有间隙控制几何的声学传感器和制造声学传感器的方法公开(公告)号：US20150271606A1
公开(公告)日：2015-09-24
申请号：US14702319
申请日：2015-05-01
发明人： Karl Grosh , Robert J. Littrell
IPC分类号： H04R17/02 , H01L41/314 , H01L41/332 , H01L41/27 , H04R7/06 , H04R31/00
CPC分类号： H04R17/02 , H01L41/27 , H01L41/314 , H01L41/332 , H04R7/06 , H04R17/025 , H04R31/00 , H04R31/003 , H04R2201/003 , H04R2410/03
摘要： A transducer of the preferred embodiment including a transducer and a plurality of adjacent, tapered cantilevered beams. Each of the beams define a beam base, a beam tip, and a beam body disposed between the beam base and the beam tip. The beams are arranged such that each of the beam tips extends toward a common area. Each beam is joined to the substrate along the beam base and is free from the substrate along the beam body. A preferred method of manufacturing a transducer can include: depositing alternating layers of piezoelectric and electrode onto the substrate in block, processing the deposited layers to define cantilever geometry in block, depositing metal traces in block, and releasing the cantilevered beams from the substrate in block.
摘要翻译： 优选实施例的换能器包括换能器和多个相邻的锥形悬臂梁。 每个梁限定了梁基部，梁尖端和设置在梁基部和梁尖之间的梁主体。 梁被布置成使得每个梁尖端朝向公共区域延伸。 每个光束沿着光束基座连接到基板，并且沿着光束主体离开基板。 制造换能器的优选方法可以包括：将块状的压电和电极的交替层淀积到衬底上，处理沉积的层以限定块中的悬臂几何形状，在块中沉积金属迹线，以及从块中的衬底释放悬臂梁 。
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