SIDO controller design for a high performance optical drive

This paper presents the results of a single-input/dual-output (SIDO) control design for a high performance optical drive. The optical drive consists of a dual-input/single-output (DISO) actuator: both a sledge actuator and a rotating mirror contribute to a radial movement of the spot on the disk. The used controller design method is a modified version of the PQ design method. The design method reduces the problem to two SISO design problems for which frequency response design techniques can be used. The first step is focused on designing a parallel combination of the two subsystems such that the parallel plant allows optimal design freedom. The second design issue is the design of the controller for the created parallel system. Here, the focus is on stability and achieving performance specifications. The design method leads to good insights in the system characteristics.