Patent ID: 6245590
Filing Date: 2001-06-12
Classification: G02B,G06K,G09G

Abstract:
A method of controlling a MEMs device formed in a semiconductor wafer, comprising the steps of:while the MEMs device is an integral part of the wafer, activating the MEMs device for resonant motion of a portion of the MEMs device relative to a reference point;monitoring the resonant motion of the MEMs device;responsive to the monitored resonant motion of the MEMs device, identifying a deviation of the resonant motion from a desired periodic motion;generating an error signal in response to the identified deviation; andwhile the MEMs device is an integral part of the wafer and responsive to the error signal, varying material properties with a region of the MEMs device in a manner that changes the frequency of the resonant motion by introducing an impurity into a portion of the semiconductor wafer.