Title :
Read channel for perpendicular magnetic recording
Author :
Madden, Michael ; Öberg, Mats ; Wu, Zining ; He, Runsheng
Author_Institution :
Marvell Semicond. Inc., Sunnyvale, CA, USA
Abstract :
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.
Keywords :
perpendicular magnetic recording; signal processing; spin valves; PMR spin-stand system; adaptive baseline-tracking loop; analog front-end; baseline loop; differential servo mode; partial-response maximum-likelihood targets; perpendicular magnetic recording; read channel; signal processing; Frequency; Land mobile radio; Magnetic heads; Magnetic recording; Magnetic semiconductors; Perpendicular magnetic recording; Polynomials; Signal processing; Soft magnetic materials; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.821187
