Microphone bias circuit

Details Microphone bias circuit Microphone bias circuit

2008-05-13

2008-05-13

Chin, Vivian (Department: 2635)

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

C381S113000, C381S112000, C381S122000, C381S092000

Reexamination Certificate

active

07372967

ABSTRACT:
A microphone bias circuit includes a first integrated circuit (IC) pin, a second IC pin, a first resistor, and a variable supply voltage buffer. The first resistor is operably coupled to the first IC pin and a return voltage. The second IC pin is operably coupled to receive analog signals from a microphone. The variable supply voltage buffer is operably coupled to produce a buffered supply voltage based on a variable impedance setting, wherein at least one off-chip component couples the second IC pin to the first IC pin and wherein the variable supply voltage buffer provides the buffered supply voltage to second IC pin as a microphone bias voltage.

REFERENCES:
patent: 6243817 (2001-06-01), Melo et al.
patent: 6759906 (2004-07-01), Matsunaga et al.
patent: 2005/0276423 (2005-12-01), Aubauer et al.

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