Patent ID: 7355318

Claim:
A micromachined device for filtering vibrations caused by an external disturbance, the device comprising: (a) a support frame; (b) a proof mass; (c) a first electrostatic comb drive assembly for filtering the vibrations caused by external disturbance including: (i) a first array of stationary elements coupled to the support frame, wherein each of the first array of stationary elements is electrically insulated from the others; and (ii) a second array of movable elements interspersed with the first array and coupled to the proof mass; (d) a position sensor coupled to the device for sensing displacement of the proof mass relative to the support frame; and (e) a control system for applying an external voltage across the first array and second array to change a frequency response of the device, wherein a drive voltage is independently set by the external voltage and one of the second array of movable elements is pulled electrostatically closer to one of the first array of stationary elements.