ACTIVE BIAS OF MICROPHONE WITH VARIABLE BIAS RESISTANCE

    公开(公告)号:US20190306632A1

    公开(公告)日:2019-10-03

    申请号:US15940033

    申请日:2018-03-29

    Abstract: A bias circuit for a capacitive sensor may include a variable impedance element coupled to a capacitor of the capacitive sensor wherein an impedance of the variable impedance element is varied in accordance with a temperature associated with the bias circuit and an active feedback circuit coupled between the variable impedance element and an output of a processing circuit for processing a signal generated by the capacitive sensor and configured to drive the variable impedance element to force a direct-current (DC) voltage level of an output of the capacitive sensor to a desired voltage.

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