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US 2009/0154729 A1Published application
Filter Circuit for an Electret Microphone
AssigneeKnowles Electronics, LLC
InventorMichael Jennings
Life of this patent
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Abstract
A miniature electret microphone includes an input buffer circuit. The input buffer circuit includes an integrated circuit including a floating ground substrate and a p-n junction. The p-n junction is coupled as a capacitor to a filter circuit of the input buffer circuit
Claims8
A buffer circuit for a transducer comprising:
- an integrated circuit including a floating substrate and a p-n junction;
- and
- a filter circuit formed within the integrated circuit, the filter circuit including a capacitor formed by the p-n junction.
A miniature electret microphone comprising:
- a housing for the microphone including a sound inlet port;
- a back plate/diaphragm assembly disposed within the housing, the assembly having an output responsive to sound pressure incident on the diaphragm;
- an integrated circuit including a floating ground substrate and a p-n junction disposed within the housing coupled to the output;
- and
- a filter circuit formed within the integrated circuit, the filter circuit including a capacitor formed by the p-n junction.
2 more elements
Dependencies are inferred from the claim text.