Microphone and control circuit for the microphone
A microphone and circuit technology, applied to circuits, electrical components, electrostatic sensors, etc., can solve problems such as large signal loss and low signal-to-noise ratio
Active Publication Date: 2022-06-03
KNOWLES ELECTRONICS INC
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- Application Information
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Problems solved by technology
Smaller microphones typically experience greater signal loss due to friction and typically have lower signal-to-noise ratios than larger microphones
Method used
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[0076]Performance losses in microelectromechanical systems (MEMS) microphones are due to viscous losses in the backplane of the MEMS device. The detrimental effect of viscous losses on microphone performance increases with decreasing microphone size. Backplane viscous losses can be significantly reduced by encapsulating MEMS devices under low pressure or ideal vacuum conditions. However, packaging under low pressure or vacuum conditions makes the MEMS device more responsive to changes in atmospheric pressure, which can create noise in the acoustic signals and / or data sensed by the MEMS device. The atmospheric pressure at sea level is 100kPa, which is about 3 orders of magnitude higher than the dynamic range of sound pressure (200Pa). The present disclosure relates to counteracting measurement fluctuations in atmospheric pressure by generating counteracting electrostatic forces.
[0077] The present disclosure provides a dielectric comb for use with MEMS transducers. The die...
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Abstract
The present application provides a microphone and a control circuit for the microphone. A microphone includes a housing defining a cavity, a plurality of conductors positioned within the cavity, at least one dielectric rod positioned within the cavity, and a transducer diaphragm. The conductor is configured to move in response to pressure changes while the housing remains stationary. The first conductor generates a first electrical signal in response to a change in pressure caused by a change in atmospheric pressure. The second conductor generates a second electrical signal in response to pressure changes caused by the acoustic activity. The dielectric rod is fixed relative to the cavity and remains fixed under pressure changes. A dielectric rod is adjacent to at least one of the conductors. In response to the applied pressure, which is atmospheric pressure and / or acoustic pressure, the transducer diaphragm exerts a force on the housing and displaces at least a portion of the conductor relative to the dielectric rod.
Description
[0001] Cross-references to related patent applications [0002] This application claims the benefit of US Provisional Patent Application No. 62 / 646,003, filed March 21, 2018, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present application relates to a microphone and a control circuit for the microphone. Background technique [0004] Microphones are deployed in various types of devices, such as personal computers, cellular phones, mobile devices, headsets, headsets, and hearing aid devices. However, as devices get smaller, they require smaller microphones. Smaller microphones generally experience greater signal loss due to friction and generally have a lower signal-to-noise ratio than larger microphones. SUMMARY OF THE INVENTION [0005] One implementation involves a microphone including a dielectric comb and a control circuit. The microphone includes a housing defining a cavity, a plurality of conductors positioned wi...
Claims
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IPC IPC(8): H04R19/04B81B3/00H04R19/00G01L9/00
CPCH04R19/005H04R19/04G01L23/125B81B7/02B81B2201/0257B81B2201/0264B81B2203/0127B81B2203/0136B81B2207/03B81C1/00341B81C2201/0109B81C2201/0132G01L9/0072G01L19/14H04R31/00H04R2201/003
Inventor M·纳瓦扎S·舒伯姆D·谢弗M·佩德森C·弗斯特M·沙扬J·切赫
Owner KNOWLES ELECTRONICS INC