FPGA based fine tracking control system for Blu-ray disc system considering 1.5µsec delay time

Recently, the data size of digital content has increased. To address the resultant storage issues, manufacturers have tried to increase storage capacity by narrowing the track pitch of digital storage media.[1] Considering all these factors, a high-precision tracking control system is required for optical discs. In this study, this paper develop and implement a feedforward control system using an trajectory command prediction mechanism to effectively suppress periodic components by field-programmable gate array (FPGA). This paper proposes a zero-phase error-tracking feedforward control system[2], [3] that considers the delay time component. This paper design and implement the propose control system for a test system, the ODU-1000 for Blu-ray, which is implanted in a digital signal processor (DSP). The results show that there is increased delay time because of the calculation time. In the configuration of the control system, this paper implement both feedback and feedforward control systems using a FPGA. The control system realizes high-speed control operation as a hardware controller. Experimental results obtain confirm that the propose system is practical and effective.