A CMOS two-path tree search detector

Two-path tree search (TBTS) is a detection algorithm combining a decision-feedback equalizer (DFE) and a two-path tree search estimator. This sub-optimal tree search overcomes the exponential increase in hardware complexity with the tree length in a fixed-delay tree search (FDTS) structure. An adaptive mixed-signal CMOS TPTS detector is presented in this paper. The IC occupies 2.77 mm by 2.44 mm (including the bonding pads) in a 0.5 /spl mu/m CMOS process. It performs about 0.8 dB better than a conventional DFE in a disk drive read channel.

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