Patent ID: 8373522

Claim:
A system comprising a varactor device, said varactor device comprising: a gap closing actuator (GCA) varactor, comprising at least one drive comb structure, at least one output varactor structure defining an output capacitance, at least one reference varactor structure defining a reference capacitance, and at least one movable truss comb structure interdigitating said drive comb, said output varactor, and said reference varactor structures, said truss comb structure configured to move along a motion axis between a plurality of interdigitated positions based on an output bias voltage applied between said truss comb structure and said drive comb structure; and a feedback circuit electrically coupled to said reference varactor structure, said feedback circuit configured to selectively modify an input bias voltage based on said reference capacitance to produce said output bias voltage that provides a target capacitance at said output varactor structure.