The present invention is directed to a control system for a MEMS device, such
as a MEMS mirror, that uses sliding mode analysis to accurately and predictably
control the position of the mirrors in a MEMS device. The present invention also
uses the capacitance of the mirror to detect the position of the mirror. In one
embodiment, a MEMS mirror device mounted on a substrate is described that includes,
a micro mirror that is pivotable about an axis, a first conductive layer on the
mirror, a second conductive layer on the substrate, the first and second conductive
layers form a first capacitor for determining the position of the mirror. The sliding
mode control can be implemented using various drive mechanisms, including electrostatic
drives. When used with electrostatic drives, conductive layers that create the
capacitors can also be used to drive the mirror. The detection-drive system can
be time multiplexed to simplify implementation and to avoid cross talk. An application
Specific Integrated Circuit (ASIC) can be used to control the detection and drive
of the mirrors.