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A constrained asymmetry LMS algorithm for PRML disk drive read channels

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3 Author(s)
Staszewski, R.B. ; Texas Instrum. Inc., Dallas, TX, USA ; Muhammad, K. ; Balsara, P.T.

We present an implementation of a constrained least mean square (C-LMS) algorithm with application to high-speed magnetic disk drive read channels. The main advantage offered by the presented C-LMS algorithm is improved stability of the outer timing recovery loop while the spectral shaping of read-back data is performed in the inner adaptation loop. This eliminates any unstable behavior of the timing recovery loop during C-LMS algorithm adaptation. Another benefit derived from this approach is reduction in coefficient switching gradient noise. The proposed algorithm has been implemented and fabricated in a commercial read channel using a 0.18 μm L-effective CMOS technology. It operates at 550 MHz worst case

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:48 ,  Issue: 8 )