Patent ID: 8134375
Filing Date: 2012-03-13
Classification: G01D,H04R

Abstract:
1. A capacitive Micro Electro Mechanical System (MEMS) sensor device that senses a mechanical quantity, the capacitive MEMS sensor comprising: a capacitive MEMS sensing element, having two plates arranged in parallel at a distance that varies in response to said mechanical quantity, that converts the sensed mechanical quantity into an electrical quantity; a first bias voltage unit that supplies a first bias voltage (V a second bias voltage unit that supplies a second bias voltage (V a signal processing unit that processes said electrical quantity into an output signal (V a comparator unit that compares said output signal (V a control unit that controls the discharge of said capacitive MEMS sensing element based upon said comparator signal by connecting, after detection of the overload condition, said first plate to a discharge terminal during a first time interval and said second plate to the discharge terminal during a second time interval wherein the first bias voltage and the second bias voltage are separately controlled.