Implementation of a digital read/write channel with EEPR4 detection
Dave Welland, S. Phillip, T. Tuttle, Ka Leung, S. Dupuie, D. Holberg, R. Jack, N.S. Sooch, R.T. Behrens, Kent R. Anderson, A.J. Armstrong, W.G. Bliss, T.O. Dudley, B. Foland, N. Glover, Lydia King · IEEE Transactions on Magnetics · 1995
A fully integrated digital read/write channel for magnetic recording applications is described. The device employs partial response maximum likelihood (PRML) sequence detection when reading data to enhance bit error rate vs. signal-to-noise ratio performance. The sequence detector is designed to accept input pulses exhibiting four non-zero samples, sampling occurring once per channel bit time. Channel optimization is facilitated through the inclusion of sixty-two 8-bit registers. The device is fabricated in a 0.8 micron double-metal CMOS process and supports data rates as high as 64 Mbits/sec.>