A dual-channel analog servo-signal processor for 13 Gb tape drives

This paper describes the first dual-channel analog signal processor for servo control in a 13 Gbyte QIC tape drive systems. The highly programmable low-power, low-cost CMOS IC provides 12 bit accuracy employing sophisticated real-time peak-detection, error correction, and calibration. It provides both analog and digital servo information, servo motor control and built-in analog test capability. Innovative circuit implementations presented here include a high-bandwidth VGA and a peak-detector with clock recovery which removes the need for on-chip PLLs. Behavioral modeling of the entire chip was used to ensure system integrity.<>