Abstract: A capacitive sensor assembly is disclosed, including a capacitive motor coupled to a charge pump circuit via a low pass filter, and a frontend amplifier circuit having an input coupled to the capacitive motor interface and an output coupled to an output of the electrical circuit. An injection current source (ICS) is coupled to the charge pump circuit output and configured to control voltage across a diode-based resistive element of the low pass filter during a transient startup phase of the charge pump circuit, wherein a settling time of the charge pump is reduced.

Abstract: A micro-electro-mechanical systems (MEMS) die includes a piston; an electrode facing the piston, wherein a capacitance between the piston and the electrode changes as the distance between the piston and the electrode changes; and a resilient structure (e.g., a gasket or a pleated wall) disposed between the piston and the electrode, wherein the resilient structure supports the piston and resists the movement of the piston with respect to the electrode. A back volume is bounded by the piston and the resilient structure and the resilient structure blocks air from leaving the back volume. The piston may be a rigid body made of a conductive material, such as metal or a doped semiconductor. The MEMS die may also include a second resilient structure, which provides further support to the piston and is disposed within the back volume.

Abstract: A microelectromechanical systems (MEMS) sensor, a capacitive MEMS motor sensing circuit and a method are provided. The MEMS sensor includes a housing having electrical contacts disposed on an exterior of the housing. The MEMS sensor further includes a capacitive MEMS motor disposed in the housing, and an electrical circuit disposed in the housing and being electrically coupled to the electrical contacts. The electrical circuit includes a bias voltage source having an output coupled to an input of the MEMS motor. The electrical circuit further includes an amplifier including an amplifier input stage having an input, coupled to an output of the MEMS motor, the amplifier input stage having a negative input resistance, where a sum of a series resistance of the MEMS motor at the input and the negative input resistance is less than zero, and wherein application of a signal from the output of the MEMS motor to the input of the amplifier input stage produces a negative real part of input current.

Abstract: An ear-worn hearing device and acoustic transducer subassemblies therefor are disclosed. The hearing device includes a hearing device housing with a sound passage terminating at a sound port on a portion of the hearing device housing configured to protrude toward or into a user's ear canal. Multiple transducers are arranged end-to-end along a lengthwise dimension, wherein a first transducer is located between the other transducers and the sound port of the hearing device housing. The transducers each include a sound outlet acoustically coupled to the sound port via the sound passage.

Abstract: A microphone assembly including an acoustic transducer that generates an electrical signal responsive to acoustic activity, and an integrated circuit electrically coupled to the acoustic transducer and that receives the electrical signal from the acoustic transducer and generate an output signal representative of the acoustic activity. The microphone assembly also includes a substrate comprising a first surface on which the integrated circuit is mounted, a guard ring mounted on the substrate and elevated relative to the first surface of the substrate, and a can mounted to the guard ring, wherein the can, the guard ring, and the substrate form a housing in which the transducer and integrated circuit are disposed.

Abstract: A microelectromechanical systems (MEMS) die comprises a first diaphragm having a first side and a second side, and a second diaphragm having a first side facing the first side of the first diaphragm. A first plurality of interconnect strips is disposed along at least the first side of the first diaphragm, a second plurality of interconnect strips is disposed along the first side of the first diaphragm, and a third plurality of interconnect strips is disposed along the first side of the second diaphragm. First, second, and third runner strips are disposed along the second side of the first diaphragm transverse to the first, second, and third plurality of interconnect strips, respectively. Each of the first, second, and third runner strips is electrically connected to at least a subset of the first, second, and third plurality of interconnect strips, respectively, via electrical connections disposed through the first diaphragm.

Abstract: The disclosure relates to a transducer assembly like a microphone including a bias circuit having a charge pump and a filter circuit coupled to a transducer. The filter circuit includes a voltage-controlled resistor located between an output of the charge pump and the transducer, and a capacitor coupled to the voltage-controlled resistor opposite the charge pump, wherein the bias circuit is configured with a larger bandwidth for faster settling during transient operation than during steady-state operation.

Abstract: The present disclosure relates to a transducer assembly including a transducer having a movable member, and a servo-loop controller configured to compensate for effects of a disturbance on the transducer assembly by adjusting a bias voltage applied to the transducer. A servo-loop controller having a smaller bandwidth for out-of-band disturbances than for in-band disturbances and configured to control the bias voltage based on a feedback signal generated by a sensor that detects an effect of the disturbance on the transducer assembly. The transducer assembly can be implemented as a microphone or a speaker among other sensors and actuators.

Abstract: A balanced armature receiver including a motor with a yoke for retaining magnets and fastening to an armature are disclosed. The yoke includes a close-ended wall structure defining a passage through which an armature is extendable. The close-ended wall structure includes a plurality of wall portions interconnecting a plurality of folded corner portions, wherein a thickness of the plurality of wall portions less than a thickness of the plurality of folded corner portions.

Abstract: A wearable loudspeaker includes a magnetic-flux-carrying housing that houses an acoustic sealing structure that separates an interior of the housing into a back volume and a front volume acoustically coupled to a sound port. A first coil is retained in the front volume and comprises a first winding about a corresponding first magnetic core. A second coil is retained in the back volume and comprises a second winding about a corresponding second magnetic core. Opposing surfaces of the first and second magnetic cores have opposite magnetic polarities and produce a magnetic field in a gap between the first and second coils. A magnetic-flux-carrying armature is movably located in the gap and fastened to the acoustic sealing structure. Sound is emitted from the sound port when the armature moves the acoustic sealing structure in the gap.

Abstract: Sound-producing acoustic receivers are disclosed. The acoustic receiver includes a receiver housing with a first internal volume and a second internal volume, a first diaphragm separating the first internal volume into a first front volume and a first back volume such that the first front volume has a first sound outlet port, a second diaphragm separating the second internal volume into a second front volume and a second back volume such that the second front volume has a second sound outlet port, a motor disposed at least partially inside the housing such that the motor including an armature mechanically coupled to both the first diaphragm and the second diaphragm, an acoustic seal between the first front volume and the second back volume such that the acoustic seal accommodates the mechanical coupling of the armature to one of the first diaphragm or the second diaphragm.

Abstract: An ear-worn hearing device including an acoustic transducer and a physiological sensor located between an acoustic sealing flange and an inner end portion of the hearing device is disclosed. The flange can be integrated with the hearing device or be an integral part of a removable ear dome. The flange is configured to form at least a partial seal with the user's ear. The flange can also prevent light from entering into the user's ear canal. A removable ear dome can be located on the hearing device by a portion of the physiological sensor protruding from the housing.

Abstract: An acoustic sensor assembly includes a housing having an external-device interface and a sound port to an interior of the housing. An electro-acoustic transducer and an electrical circuit are disposed within the housing. The electro-acoustic transducer separates the interior into a front volume and a back volume, where the sound port acoustically couples the front volume to an exterior of the housing. The back volume includes a first portion and a second portion. The electrical circuit is electrically coupled to the electro-acoustic transducer and to the external-device interface. One or more apertures acoustically couple the first and second portions of the back volume and are structured to shape a frequency response of the acoustic sensor assembly.

Abstract: A PM signal generator can generate a variable PM signal based on a position of a movable element of a MEMS motor. A bias voltage generator can provide a bias voltage to the MEMS motor. The bias voltage generator can include a reference signal generator that can generate a reference signal that varies based on variation of pulses of the PM signal. The bias voltage can be based on the reference signal.

Abstract: An acoustic receiver includes a first receiver subassembly having bottom housing plate with at least a portion of a motor fastened thereto, and a second receiver subassembly having a closed-ended housing wall with at least one open end that is fastened to the bottom housing plate. A method of making and assembling the components is also described.

Abstract: Two coils are wrapped in one of numerous different implementations. In one implementation, the two coils are wrapped about a portion of a bobbin that has at least three flanges. The first coil is disposed about a first portion of the bobbin between the first flange and the second flange, and a second coil is disposed about a second portion of the bobbin between the second flange and the third flange.

Abstract: An anchor assembly for a microelectromechanical systems (MEMS) vibration sensor suspension comprises an anchor body and at least one spring integrally extending from the anchor body. Each spring comprises a first section integrally extending at a first end away from the anchor body to a second end, and first lateral portions of second and third sections extending in opposite lateral directions from the second end. Each of the second and third sections includes a first leg that extends at a first end from the first lateral portion toward the anchor body, a second lateral portion that extends from a second end of the first leg away from the first section, and a second leg that extends from the second lateral portion at a first end away from the anchor body, wherein second ends of the second legs extend farther from the anchor body than the first lateral portions.

Abstract: A balanced armature receiver can include a motor disposed in a case. The motor can include an armature having a first portion fixed to and extending from a yoke and a second portion extending through a coil tunnel. The second portion can have a free end-portion movably disposed in a magnet gap. The balanced armature receiver can include a damping compound-locating structure disposed on one or both of the armature and another portion of the receiver proximate the armature. The balanced armature receiver can include damping compound contacting the damping compound-locating structure and located between the armature and another portion of the receiver.

Abstract: A loudspeaker for hearing devices including a diaphragm arranged in a housing to form a back volume and a front volume acoustically coupled to a sound port is disclosed. A surface of a first magnet in the front volume faces an opposing surface of a second magnet in the back volume, and the opposing surfaces of the magnets are separated by a gap and have the same magnetic polarity. An electrical coil assembly coupled to the diaphragm has a radial difference dimension to thickness dimension ratio greater than 1, wherein the diaphragm and the electrical coil assembly are movable in the gap between the magnets in response to an electrical audio signal applied to the electrical coil assembly.

Abstract: A balanced armature receiver including a motor with a yoke for retaining magnets and fastening to an armature are disclosed. The yoke includes a close-ended wall structure formed of a soft magnetic material having multiple folded corners defining an armature passage. A first magnet retaining wall portion of the yoke is arranged in parallel with, and opposite, a second magnet retaining wall portion, wherein at least a portion of the first magnet retaining wall portion has a reduced thickness relative to other wall portions of the close-ended wall structure. The armature is connected to the reduced thickness portion of the first magnet retaining wall portion, thereby reducing an overall z-axis dimension of the motor.