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

Volume

32

Issue

7

fYear

1997

fDate

7/1/1997 12:00:00 AM

Firstpage

977

Lastpage

988

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;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.597288

Filename

597288