Capacitive transducer circuit and method

Details Capacitive transducer circuit and method Capacitive transducer circuit and method

2009-05-07

2011-11-29

Reames, Matthew (Department: 2893)

Electrical audio signal processing systems and devices

Switching

C381S111000, C381S096000, C381S174000

Reexamination Certificate

active

08068623

ABSTRACT:
A capacitive transducer circuit includes a capacitive transducer having first and second electrodes. The first and second electrodes are biased by respective first and second bias voltages. An amplifier is connected to receive a first analog signal on an input terminal, the first analog signal being generated by the capacitive transducer, and to generate a second analog signal on an output terminal. A digital feedback circuit is connected between the output terminal of the amplifier and the input terminal of the amplifier. The digital feedback circuit is configured to provide one of said first or second bias voltages. A switched capacitor filter circuit may be arranged between the voltage source and the transducer and may be arranged to filter the output of the voltage source.

REFERENCES:
patent: 2006/0062406 (2006-03-01), Kinoshita
patent: 2008/0219474 (2008-09-01), Deruginsky et al.
patent: 1906704 (2008-04-01), None
patent: WO 2007/132422 (2007-11-01), None

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