Analog-to-Digital Converter Algorithms for Position

Algorithms are developed that utilize a single analog-to-digital converter in the read channel of a disk drive for dual purposes: for high-rate data detection and for high-resolution servo position error signal estimation. Iterative algorithms exploit the lower clock rate requirement of a servo field, while dithering takes advantage of the periodic characteristic of the servo position waveform. Index Terms—Analog-to-digital converter, disk drive, dithering, position control, position error signal, servo systems.