A 130 Mb/s PRML read/write channel with digital-servo detection

Abstract

The detection of servo information in hard disk drive read channels has traditionally been implemented with analog circuits and converted with an off-chip analog-to-digital converter (ADC). The benefits of digital servo detection include system cost savings through the elimination of the off-chip ADC, reduced development time, repeatability, testability, and ease of future integration. The full digital PRML chip is described.