A/D converter with integrated biasing for a microphone

Details A/D converter with integrated biasing for a microphone A/D converter with integrated biasing for a microphone

2001-07-05

2009-02-10

Mei, Xu (Department: 2615)

Electrical audio signal processing systems and devices

Circuitry combined with specific type microphone or loudspeaker

With electrostatic microphone

C381S095000, C341S143000, C341S155000, C330S296000

Reexamination Certificate

active

07489791

ABSTRACT:
A combination of a microphone and a sigma-delta A/D converter include at least one feedback loop, such as a DC feedback loop. The DC feedback loop provides the bias current for a junction FET of the microphone. In this way, the signal current from the FET can be injected directly into the input integrator of the sigma-delta A/D converter without the need of signal resistors in series with the FET.

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