ADAPTIVE CONTINUOUS-TIME EQUALIZATION FOLLOWED BY FDTS DF SEQUENCE DETECTION/

Employing an adaptive continuous-time forward equalizer with a Fixed D elay Tree Search with Decision Feedback (FDTS/DF) detector provides se veral advantages to a magnetic recording system. Although an adaptive continuous-time filter of modest complexity cannot achieve the degree of pulse shape control provided by a long FIR filter, its power consum ption may be dramatically lower. An FDTS/DF detector can be easily ada pted to widely varying equalized pulses. By combining the two, we can achieve channel performance comparable to that of a system including a n FDTS/DF detector and a long FIR equalizer - but with a power dissipa tion that is potentially much less than conventional sequence detectio n channels. Simulation results are presented that compare this new app roach with a finite length FIR equalizer followed by an FDTS/DF detect or. We present and compare several architectures for the adaptive cont inuous-time equalizer that offer improved convergence when using the l east-mean-squares (LMS) adaptation algorithm.