Title :
An experimental M2DFE detector
Author :
Lee, Yuan Xing ; Jia, Qingwei ; Wang, Jianjiang ; Li, Qing ; Bi, Lei ; Ueno, Hiroaki ; Mutoh, Hiroshi
Author_Institution :
Fujitsu Labs. Ltd., Kawasaki, Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
A 53.33 Mb/s experimental extended multi-level decision feedback equalization (M2DFE) read channel has been designed and implemented using discrete-components. The forward equalizer is the same as that of MDFE, consisting of two analog Bi-quads. The core of the detector contains two analog critical loops named as top and bottom MDFE loops and two digital error computation blocks (DEC) that compute, square, accumulate, and compare errors of the two MDFE loops when M2DFE is in erasure modes. The bench test confirms that M2DFE has 1 dB gain in signal-to-noise ratio (SNR) and about 30% reduction in error propagation over MDFE under the same test conditions. The experiment also shows M2DFE performance is relatively robust against the variations of the parameter settings such as the values of inner and outer levels, and the threshold of the slicers of the two MDFE loops
Keywords :
decision feedback equalisers; magnetic recording; signal detection; 53.33 Mbit/s; MDFE loops; analog Bi-quads; analog critical loops; bench test; detector core; digital error computation blocks; discrete-components; erasure modes; error propagation; experimental M2DFE detector; extended multi-level decision feedback equalization; forward equalizer; magnetic recording; parameter settings; read channel; signal-to-noise ratio; test conditions; Analog computers; Bismuth; Decision feedback equalizers; Delay; Detectors; Feedback circuits; Hardware; Signal to noise ratio; Testing; Timing;
Journal_Title :
Magnetics, IEEE Transactions on
