Invention Grant
- Patent Title: Switchable attenuation circuit for MEMS microphone systems
- Patent Title (中): 用于MEMS麦克风系统的可切换衰减电路
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Application No.: US12784143Application Date: 2010-05-20
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Publication No.: US08625809B2Publication Date: 2014-01-07
- Inventor: Olafur Mar Josefsson , Jens Gaarde Henriksen
- Applicant: Olafur Mar Josefsson , Jens Gaarde Henriksen
- Applicant Address: US CA San Jose
- Assignee: Invensense, Inc.
- Current Assignee: Invensense, Inc.
- Current Assignee Address: US CA San Jose
- Agency: IPxLAW Group LLP
- Agent Maryam Imam
- Main IPC: H04H40/54
- IPC: H04H40/54 ; H04R1/20

Abstract:
A switch control circuit monitors a signal produced by a MEMS or other capacitor microphone. When a criterion is met, for example when the amplitude of the monitored signal exceeds a threshold or the monitored signal has been clipped or analysis of the monitored signal indicates clipping is imminent or likely, the switch control circuit operates one or more switches so as to selectively connect one or more capacitors to a signal line from the microphone, i.e., so as to connect a selected capacitance to the signal line to attenuate the signal from the microphone and, therefore, avoid clipping. The switches may be MOSFET, MEMS or other types of switches co-located with the microphone in a common semiconductor package. Similarly, the capacitors, a circuit that processes the signals from the microphone and/or the switch control circuit may be co-located with the microphone in a common semiconductor package.
Public/Granted literature
- US20100310096A1 Switchable Attenuation Circuit for MEMS Microphone Systems Public/Granted day:2010-12-09
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