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Read channel for perpendicular magnetic recording

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4 Author(s)
Madden, M. ; Marvell Semicond. Inc., Sunnyvale, CA, USA ; Oberg, M. ; Zining Wu ; Runsheng He

This paper discusses the signal processing requirements for a perpendicular magnetic recording (PMR) read channel and presents performance measurements from a physical PMR channel, heads, and media. A signal and noise model of a PMR channel is described. Next, a search for partial-response maximum-likelihood (PRML) targets suited to PMR is performed. The components of a real PMR channel are described, including a modified analog front-end, differential servo mode, and an adaptive baseline-tracking loop. Finally, error rate data from a PMR spin-stand system is presented.

Published in:

Magnetics, IEEE Transactions on  (Volume:40 ,  Issue: 1 )