Title :
A 50-MHz standard CMOS pulse equalizer for hard disk read channels
Author :
Dehaene, Wim ; Steyaert, Mihiel S J ; Sansen, Willy
Author_Institution :
ESAT, Katholieke Univ., Leuven, Heverlee, Belgium
fDate :
7/1/1997 12:00:00 AM
Abstract :
A novel pulse equalizer for hard disk systems is discussed. Opposed to classical realizations, it is full CMOS while operating at 50 MHz cutoff frequency. It is explained how the equalizer can be extended with a selective boost of 13 dB around the cutoff frequency for pulse slimming. The equalizer is a gm-C seventh-order, 0.05° equiripple-on-the-phase low-pass filter. It is made out of biquads with matched integrating nodes. The inaccuracies are compensated with a novel tuning system. This guarantees a ripple on the group delay of 2%. The results are confirmed on 0.7-μm CMOS silicon
Keywords :
CMOS analogue integrated circuits; biquadratic filters; equalisers; hard discs; low-pass filters; 0.7 micron; 50 MHz; biquads; cutoff frequency; equiripple-on-the-phase low-pass filter; hard disk read channels; integrating nodes; pulse slimming; standard CMOS pulse equalizer; tuning system; CMOS technology; Cutoff frequency; Equalizers; Hard disks; Intersymbol interference; Low pass filters; Magnetic materials; Maximum likelihood detection; Pulse measurements; Saturation magnetization;
Journal_Title :
Solid-State Circuits, IEEE Journal of
