A 300-MHz fixed-delay tree search-DFE analog CMOS disk-drive read channel

A decision feedback equalizer (DFE) with digital error detection and correc tion Implements a fixed-delay tree search with depth of 2. The disk-drive r ead waveform, is first equalized to EPR4 for clock recovery and then re-equ alized to the DFE target. A mostly analog implementation of this read chann el in 0.6-mum CMOS implements a tapped delay-line forward filter with a cas cade of track-and-hold circuits and variable transconductors. Using MTR (2, k) code, the compact read channel IC surpasses a conventional EPR4 read cha nnel with Viterbi detector at user densities in the range 2.0-3.0.