Microphone bias circuits

Details Microphone bias circuits Microphone bias circuits

2008-02-21

2011-11-15

Thai, Luan C (Department: 2891)

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

C381S113000

Reexamination Certificate

active

08059836

ABSTRACT:
A microphone bias circuit is disclosed. A current source provides a first current. A voltage buffer provides a first reference voltage. A microphone coupled between the current source and the first reference voltage receives acoustic waves and converts the received acoustic waves to a second current. A loading device coupled between the current source and a second reference voltage lower than the first reference voltage outputs an output voltage according to the first current and the second current.

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